Biodegradation Process and Composition

- Agrinos AS

Disclosed are novel microbial compositions and biodegradation processes to treat marine animal or marine animal by-products to produce solid, liquid and lipid fractions that contain useful compounds.

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Description

This application is a U.S. National Stage application under 37 C.F.R. §3.71, claiming priority to PCT application serial no. PCT/EP2010/070285 filed Dec. 20, 2010, claiming the benefit of U.S. Provisional Application Ser. Nos. 61/289,706, filed Dec. 23, 2009, 61/299,869, filed Jan. 29, 2010, and 61/355,365, filed Jun. 16, 2010 under 35 U.S.C. §119(e) and are expressly incorporated herein by reference.

TECHNICAL FIELD

Disclosed are novel microbial compositions and microbial processes to treat marine animal by-products and in some cases the entire marine animal to produce solid, liquid and lipid fractions that contain useful compounds.

BACKGROUND OF THE INVENTION

The processing of fish and marine arthropods, such as shrimp, crab and crayfish, produces large quantities of marine by-products. Most are used in low end products such as fertilizers, fish silage or pet food but the unused by-products pose an economic burden for the marine product processing industries because of the need to dispose of such residues in an environmentally sound way. By some estimates such by-products represent 25% of the total production captured by fisheries.

For example, during the processing of shrimp for its subsequent freezing and marketing, a large amount of remains are generated since 35% of the animal is inedible and must be discarded. These remnants or by-products are composed of the shrimp's cephalothorax and exoskeleton. However, these shrimp by-products are rich in high-value substances, such as chitin, protein, lipids, carotenoid pigments (astaxanthine) and minerals. The majority of the inedible by-products are disposed at landfills or dumped back into the ocean, thus causing serious environmental problems and considerable losses to the shrimp processing industry. At present, only a small amount of these by-products are used as a supplement for animal feed.

The most common technique for shrimp by-product utilization is sun drying. This technique has low hygienic control and the products are used primarily for animal consumption. Other methods employ chemical acids and alkalis at different concentrations, temperatures and times for the extraction of chitin and recovery of protein hydrolysates. However, these methods cause a depolymerization and partial deacetylation of the chitin. Moreover, these methods complicate the recovery of other products, such as protein and pigment.

Enzymatic methods have been developed for the extraction of chitin, liquid hydrolysates and pigments. Such methods use enzymatic extracts or enzyme isolates. Other studies have reported the use of microbial enzymes, such as commercial alcalase, for the extraction of proteins from shrimp and marine animal by-products. The combination of alcalase and pancreatin has been reported for the extraction of chitin, hydrolyzed protein and pigmented lipids.

Lactic fermentation processes have been used as a substitute for the above chemical and enzymatic processes. Fermentation represents a cost effective technique which stabilizes and retains the nutritional quality of the by-products. The optimal conditions for fermentation depend on several factors including the choice and concentration of carbohydrates, pH, temperature, time, and the choice of aerobic or anaerobic conditions. Another important factor is the choice of microorganism and initial inoculum concentration. To facilitate the fermentation process of shrimp by-products pure cultures of lactic acid bacteria (LAB) have been used. Such LAB include Lactobacillus plantarum (Rao, M. S., Stevens, W. F., 2006, “Fermentation of shrimp biowaste under different salt concentrations with amylolytic and non-amylolitic Lactobacillus strains for chitin production,” Food Technology and Biotechnology 44, 83-87; Rao, M. S., Munoz, J., Stevens, W. F., 2000, “Critical factors in chitin production by fermentation of shrimp biowaste,” Applied Microbiology and Biotechnology 54, 808-813; Bhaskar, N., Suresh, P. V., Sakhare, P. Z., Sachindra, N. M., 2007, “Shrimp biowaste fermentation with Pediococcus acidolactici CFR2182: optimization of fermentation conditions by response surface methodology and effect of optimized conditions on deproteination/demineralization and carotenoid recovery,” Enzyme and Microbial Technology 40, 1427-1434), Lactobacillus sp. 82 (Circ, L. A., Huerta, S., Hal, G. M., Shirai, K., 2002, “Pilot scale lactic acid fermentation of shrimp waste for chitin recovery,” Process Biochemistry 37, 1359-1366; Shirai, K., Guerrero, I., Huerta, S., Saucedo, G., Castillo, A., Gonzalez, R. O., Hall, G. M., 2001, “Effect of initial glucose concentration and inoculation level of lactic acid bacteria in shrimp waste ensilation,” Enzyme and Microbial Technology 28, 446-452), Lactobacillus casei (Shirai 2001), Lactobacillus paracasei (Jung, W. J., Jo, G. H., Kuk, J. H., Kim, Y. J., Oh, K. T., Park, R. D., 2007, “Production of chitin from red crab shell waste by successive fermentation with Lactobacillus paracasei KCTC-3074 and Serratia marcescens FS-3,” Carbohydrate Polymers 68, 746-750), Lactobacillus pentosus (Bautista, J., Jover, M., Gutierrez, J. F., Corpas, R., Cremades, O., Fontiveros, E., Iglesias, F., Vega, J., 2001, “Preparation of crayfish chitin by in situ lactic acid production,” Process Biochemistry 37, 229-234; Shirai 2001), Lactobacillus acidophilus 84495 and Lactobacillus lactis (Bhaskar 2007), Lactobacillus salvarus (Beaney 2005), Enteroccus facium (Beaney 2005), Pedioccoccus acidilactici (Bhaskar 2007) and Pedioccoccus sp. L1/2 (Choorit, W., Patthanamanee, W., Manurakchinakorn, S., 2008, “Use of response surface method for the determination of demineralization efficiency in fermented shrimp shells,” Biores. Technol. 99, 6168-6173). In addition, a mixture of four LAB has been used (Bhaskar 2007) and there are reports using Lactobacillus in combination with Serratia marcescens FS-3 (Jung 2007) or Staphylococcus carnosus (Shirai 2001). However, the industrialization of such fermentation processes has not been successful due the poor performance of commercial inoculants.

Lactic fermentation of shrimp by-products produces protein hydrolysates, chitin, minerals, and lipids. Chitin and its deacetylated derivatives have many applications in agriculture, biomedicine, food and the paper industry, while liquid hydrolysate is an excellent source of essential amino acids that can be used for human or animal consumption. The lipidic paste contains sterols, vitamin A and E, and carotenoid pigments such as astaxanthin which can be used in feed for salmonoids or as a natural coloring in the food industry.

Chitin is a natural polysaccharide found particularly in the exoskeleton of crustaceans, the cuticles of insects, and the cell walls of fungi. Because chitin is one of the most abundant biopolymers, much interest has been paid to its biomedical, biotechnological and industrial applications. Chitosans are poly-(β-1-4)-N-acetyl-D-glucosamine compounds produced by the deacetylation of chitin (β-1-4)-N-acetyl-D-glucosamine. Glucosamine is an amino monosaccharide obtained by de-polymerization of chitosan. It participates in the constitution of glycosaminoglycans, a major class of extracellular complex polysaccharides. Glucosamine sulphate, glucosamine hydrochloride and N-acetyl-glucosamine are commonly used alone or as part of a mixture.

Generally, the liquid hydrolysate has a high content of essential amino acids, indicating a high nutritional value that justifies its use as a supplement for animal and aquaculture nutrition or as a nitrogen source in growth media for microorganisms. Additionally, these hydrolysates are a source of free amino acids and can be used for nutrition in plants as a biostimulant.

Astaxanthine (3,3″-dihydroxy-8,8-carotene-4,4′-dione), a ketocarotenoid oxidized from β-carotene, naturally occurs in a wide variety of marine and aquatic organisms. Due to its attractive pink color, its biological functions as a vitamin A precursor, and antioxidative activity, astaxanthine can be used as a colorant in food and in medicine. In the structure of astaxanthine, two identical asymmetric carbon atoms at C3 and C3′ are found. However trans-asthaxanthine is the quantitatively most prevalent carotenoid in crustacean species.

References disclosing these and other products from lactic fermentation include: Sanchez-Machado et al. “Quantification of organic acids in fermented shrimp waste by HPLC” Food Technology and Biotechnology, volume 46, 456 (2008); Sanchez-Machado et al. “High-performance liquid chromatography with fluorescence detection for quantitation of tryptophan and tyrosine in a shrimp waste protein concentrate”, Journal of Chromatography B, volume 863, 88 (2008); Lopez-Cervantes et al., “Quantitation of glucosamine from shrimp waste using HPLC” Journal of Chromatographic Science, volume 45, 1 (2007); Lopez-Cervantes et al., “Quantification of astaxanthin in shrimp waste hydrolysate by HPLC” Biomedical Chromatography, volume 20, 981 (2006); Lopez-Cervantes et al., “High-performance liquid chromatography method for the simultaneous quantification of retinol, alpha-tocopherol, and cholesterol in shrimp waste hydrolysate” Journal of Chromatography A, volume 1105, 1-2 (2006); Lopez-Cervantes et al., “Analysis of free amino acids in fermented shrimp waste by high-performance liquid chromatography”, Journal of Chromatography A, volume 1105, 1 (2006).

SUMMARY OF THE INVENTION

Disclosed are microbial compositions and biodegradation processes.

One microbial composition comprises (a) one or more lactic acid bacteria (LAB) and (b) one or more or two or more microorganisms selected from the group of genera consisting of Bacillus, Azotobacter, Trichoderma, Rhizobium, Clostridium, Pseudomonas, Streptomyces., Micrococcus, Nitrobacter and Proteus. In preferred embodiments at least one of the Bacillus, Azotobacter, Trichoderma, Rhizobium, Clostridium, Pseudomonas, Streptomyces., Micrococcus, Nitrobacter and Proteus is a chitinolytic strain that produces a chitinase (e.g. endochitinase and/or exochitinase). In some microbial compositions the LAB is selected from the genera consisting of Lactobacillus, Pediococcus, Lactococcus, and Streptococcus. When the LAB is Lactobacillus, it is preferred that the LAB is Lactobacillus acidophilus and/or Lactobacillus casei, more preferably Lactobacillus acidophilus (Bioderpac, 2008) and Lactobacillus casei (Bioderpac, 2008).

The Bacillus in this composition is preferably selected from the group consisting of Bacillus subtilis, Bacillus cereus, Bacillus megaterium, Bacillus licheniformis and Bacillus thuringiensis, more preferably Bacillus subtilis (SILoSil® BS), Bacillus cereus (Bioderpac, 2008), Bacillus licheniformis (Bioderpac, 2008) and Bacillus thuringiensis strains HD-1 and HD-73 (SILoSil®BT).

The Azotobacter in this composition is preferably Azotobacter vinelandii, more preferably Azotobacter vinelandii (Bioderpac, 2008).

The Trichoderma in this composition is preferably Trichoderma harzianum, more preferably Trichoderma harzianum (TRICHOSIL)

The Rhizobium in this composition is preferably Rhizobium japonicum, more preferably Rhizobium japonicum (Bioderpac, 2008).

The Clostridium in this composition is preferably Clostridium pasteurianu, more preferably Clostridium pasteurianu (Bioderpac, 2008).

The Pseudomonas in this composition is preferably Pseudomonas fluorescens, more preferably Pseudomonas fluorescens (Bioderpac, 2008).

Another microbial composition comprises one or more or two or more microorganisms selected from the group consisting of Bacillus subtilis ((SILoSil® BS), Bacillus cereus (Bioderpac, 2008), Bacillus megaterium (Bioderpac, 2008), Azotobacter vinelandii (Bioderpac, 2008), Lactobacillus acidophilus (Bioderpac, 2008), Lactobacillus casei (Bioderpac, 2008), Trichoderma harzianum (TRICHOSIL), Rhizobium japonicum (Bioderpac, 2008), Clostridium pasteurianum (Bioderpac, 2008), Bacillus licheniformis (Bioderpac, 2008), Pseudomonas fluorescens (Bioderpac, 2008), Bacillus thuringiensis strains HD-1 and HD-73 (SILoSil®BT), Streptomyces (Bioderpac, 2008), Micrococcus (Bioderpac, 2008), Nitrobacter (Bioderpac, 2008) and Proteus (Bioderpac, 2008).

Another embodiment of a microbial composition of comprises Lactobacillus acidophilus (Bioderpac, 2008) and/or Lactobacillus casei (Bioderpac, 2008).

A particularly preferred microbial composition comprises Bacillus subtilis (SILoSil® BS), Bacillus cereus (Bioderpac, 2008), Bacillus megaterium (Bioderpac, 2008), Azotobacter vinelandii (Bioderpac, 2008), Lactobacillus acidophilus (Bioderpac, 2008), Lactobacillus casei (Bioderpac, 2008), Trichoderma harzianum (TRICHOSIL), Rhizobium japonicum (Bioderpac, 2008), Clostridium pasteurianum (Bioderpac, 2008), Bacillus licheniformis (Bioderpac, 2008), Pseudomonas fluorescens (Bioderpac, 2008), Bacillus thuringiensis strains HD-1 and HD-73, Streptomyces (Bioderpac, 2008), Micrococcus (Bioderpac, 2008), Nitrobacter (Bioderpac, 2008) and Proteus (Bioderpac, 2008).

A preferred microbial composition is HQE. HQE was deposited with the American Type Culture Collection (ATCC) Manassas, Va., USA on Apr. 27, 2010 and given Patent Deposit Designation PTA-10861.

Also disclosed are isolated microorganisms selected from the group consisting of Bacillus subtilis (SILoSil®BS), Bacillus cereus (Bioderpac, 2008), Bacillus megaterium (Bioderpac, 2008), Azotobacter vinelandii (Bioderpac, 2008), Lactobacillus acidophilus (Bioderpac, 2008), Lactobacillus casei (Bioderpac, 2008), Trichoderma harzianum (TRICHOSIL), Rhizobium japonicum (Bioderpac, 2008), Clostridium pasteurianum (Bioderpac, 2008), Bacillus licheniformis (Bioderpac, 2008), Pseudomonas fluorescens (Bioderpac, 2008), Bacillus thuringiensis strains HD-1 and HD-73 (SILoSil®BT), Streptomyces (Bioderpac, 2008), Micrococcus (Bioderpac, 2008), Nitrobacter (Bioderpac, 2008) and Proteus (Bioderpac, 2008).

The biodegradation process comprises mixing a marine animal or marine animal by-product with any of the aforementioned microbial compositions to form a mixture; fermenting the mixture; and separating the mixture into solid, aqueous and lipid fractions. Unlike prior art biodegradation processes, the disclosed biodegradation process produces chitosan and glucosamine which can be found in the aqueous fraction. The marine animal is preferably a marine arthropod, such as shrimp, crayfish, crab or krill. In some embodiments the marine animal is fish or a fish by product such as fish skin, muscle or organ.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 schematically shows a preferred degradation process for shrimp by-products.

FIG. 2 depicts the pH and total titratable acidity during lactic fermentation of the shrimp by-products.

 DETAILED DESCRIPTION OF THE INVENTION

As used herein, the term “marine animal” refers to any animal that lives in oceans, seas or fresh water. Marine animals include fish and marine arthropods.

As used herein the term “marine arthropod” refers to an invertebrate marine animal having an exoskeleton that lives in oceans, seas or fresh water. Generally marine arthropods have a segmented body, and jointed appendages. Marine arthropods are members of the subphylum Crustacea. Preferred classes of Crustacea include Branchiopoda (e.g. brine shrimp, Cladocera and Triops), Cephalocardia (e.g. horseshoe shrimp), Maxillopoda (e.g. barnacles and copepods (zooplankton)), Ostracoda (e.g. ostracods) and Malacostraca (e.g. crab, lobsters, shrimp, krill etc.).

As used herein, the term “by-product” refers to any part of a marine animal. In some embodiments, the by-product is produced by the commercial processing of the marine animal. For example, in the shrimp industry, the cephalothorax and exoskeleton are shrimp by-products. In the crab and lobster processing industry the exoskeleton (shell) is a by-product.

In some embodiments, the entire arthropod can be used in the biodegradation process. For example, many krill are about 1-2 centimeters (0.4-0.8 in) long as adults but a few species grow to sizes on the order of 6-15 centimeters (2.4-5.9 in). Krill oil contains at least three components: (1) omega-3 fatty acids similar to those in fish oil, (2) omega-3 fatty acids conjugated to phospholipids and (3) the antioxidant astaxanthin. In addition, the exoskeleton contains fluoride. Accordingly, these components can be separated in the biodegradation process with the oil components being isolated in the lipid fraction and the fluoride in the liquid fraction.

As used herein the term “microbial composition” refers to a liquid, solid or gelatinous medium containing or physically supporting one or more microorganisms, preferably two or more. Microbial compositions include, but are not limited to, fermentation broths containing one or more microorganism(s) and inoculums which are generally used to start a fermentation broth and which contain a higher concentration of the microorganisms than which are present in the fermentation broth. Microbial compositions containing species/strains are sometimes referred to as “Bioderpac microbial compositions” which refers to a composition containing one or more of the microorganisms or a combination of one or more microorganisms with other microorganisms.

As used herein the term “isolated microorganism” refers to a liquid, solid or gelatinous medium containing or physically supporting one microorganism.

The disclosed microbial compositions or isolated microorganisms can be combined with other microorganisms to form a new microbial composition which can be used for processes other than those specifically disclosed herein. The selection of disclosed microorganism(s) will depend on its biological properties (e.g. production of protein or carbohydrate or chitin degrading enzymes), the other microorganisms selected and the process in which the combination is to be used. The selection of such components and processes will be apparent to the skilled artisan following the disclosure herein.

One microbial composition comprises (a) one or more lactic acid bacteria (LAB) and (b) one or more or two or more microorganisms selected from the group of genera consisting of Bacillus, Azotobacter, Trichoderma, Rhizobium, Clostridium, Pseudomonas, Streptomyces., Micrococcus, Nitrobacter and Proteus. In preferred embodiments at least one or more, two or more or three or more of the Bacillus, Azotobacter, Trichoderma, Rhizobium, Clostridium, Pseudomonas, Streptomyces., Micrococcus, Nitrobacter and Proteus is a chitinolytic strain that produces a chitinase (e.g. endochitinase and/or exochitinase). In some microbial compositions the LAB is selected from the genera consisting of Lactobacillus, Pediococcus, Lactococcus, and Streptococcus. When the LAB is Lactobacillus, it is preferred that the LAB is Lactobacillus acidophilus and/or Lactobacillus casei, more preferably Lactobacillus acidophilus (Bioderpac, 2008) and Lactobacillus casei (Bioderpac, 2008).

The Bacillus in this composition is preferably selected from the group consisting of Bacillus subtilis, Bacillus cereus, Bacillus megaterium, Bacillus licheniformis and Bacillus thuringiensis, more preferably Bacillus subtilis (SILoSil® BS), Bacillus cereus (Bioderpac, 2008), Bacillus licheniformis (Bioderpac, 2008) and Bacillus thuringiensis strains HD-1 and HD-73 (SILoSil®BT).

The Azotobacter in this composition is preferably Azotobacter vinelandii, more preferably Azotobacter vinelandii (Bioderpac, 2008).

The Trichoderma in this composition is preferably Trichoderma harzianum, more preferably Trichoderma harzianum (TRICHOSIL).

The Rhizobium in this composition is preferably Rhizobium japonicum, more preferably Rhizobium japonicum (Bioderpac, 2008).

The Clostridium in this composition is preferably Clostridium pasteurianu, more preferably Clostridium pasteurianu (Bioderpac, 2008).

The Pseudomonas in this composition is preferably Pseudomonas fluorescens, more preferably Pseudomonas fluorescens (Bioderpac, 2008).

Another microbial composition comprises one or more or two or more microorganisms selected from the group consisting of Bacillus subtilis ((SILoSiI® BS), Bacillus cereus (Bioderpac, 2008), Bacillus megaterium (Bioderpac, 2008), Azotobacter vinelandii (Bioderpac, 2008), Lactobacillus acidophilus (Bioderpac, 2008), Lactobacillus casei (Bioderpac, 2008), Trichoderma harzianum (TRICHOSIL), Rhizobium japonicum (Bioderpac, 2008), Clostridium pasteurianum (Bioderpac, 2008), Bacillus licheniformis (Bioderpac, 2008), Pseudomonas fluorescens (Bioderpac, 2008), Bacillus thuringiensis strains HD-1 and HD-73 (SILoSil®BT), Streptomyces (Bioderpac, 2008), Micrococcus (Bioderpac, 2008), Nitrobacter (Bioderpac, 2008) and Proteus (Bioderpac, 2008).

Another embodiment of a microbial composition of comprises Lactobacillus acidophilus (Bioderpac, 2008) and/or Lactobacillus casei (Bioderpac, 2008).

A particularly preferred microbial composition comprises Bacillus subtilis ((SILoSil® BS), Bacillus cereus (Bioderpac, 2008), Bacillus megaterium (Bioderpac, 2008), Azotobacter vinelandii (Bioderpac, 2008), Lactobacillus acidophilus (Bioderpac, 2008), Lactobacillus casei (Bioderpac, 2008), Trichoderma harzianum (TRICHOSIL), Rhizobium japonicum (Bioderpac, 2008), Clostridium pasteurianum (Bioderpac, 2008), Bacillus licheniformis (Bioderpac, 2008), Pseudomonas fluorescens (Bioderpac, 2008), Bacillus thuringiensis strains HD-1 and HD-73 (SILoSil®BT), Streptomyces (Bioderpac, 2008), Micrococcus (Bioderpac, 2008), Nitrobacter (Bioderpac, 2008) and Proteus (Bioderpac, 2008).

The preferred microbial composition for use in the biodegradation process is HQE. HQE was deposited with the American Type Culture Collection (ATCC) Manassas, Va., USA on Apr. 27, 2010 and given Patent Deposit Designation PTA-10861. HQE is a microbial consortium made up of microorganisms derived from fertile soils and microorganisms from commercial sources. The microorganisms form commercial sources include Bacillus subtilis (SILoSil® BS), Bacillus thuringiensis strains ND-1 and HD-73 (SILoSil®BT) and Trichoderma harzianum each obtained from Biotecnologia Agroindustrial S.A. DE C.V., Morelia, Michoacan, Mexico Microorganisms designated “Bioderpac 2008” by strain or species and strain can be derived from HQE. However, subsets of the microorganisms in HQE can also be used. The Bacillus subtilis (SILoSil® BS), Bacillus thuringiensis (SILoSil® BT) and Trichoderma harzianum (TRICHOSIL) microorganisms produce chitinolytic enzymes that are especially important at the beginning of the biodegradation. The chitinolytic enzymes help to degrade chitin containing solids which can constitute a barrier to further digestion. These organisms also produce proteases, lipases and other enzymes that facilitate the breakdown of proteins, lipids and carbohydrates.

As used herein, the term “HYTb refers to the aqueous fraction obtained from the biodegradation process. HYTb contains typically contains amino acids (about 3 wt % to 12 wt %, usually about 12 wt %), chitosan (about 1.2 wt %), glucosamine (about 1 wt %) and trace elements (about 6 wt %) including calcium, magnesium, zinc, copper, iron and manganese. The amount of chitosan can range between about 0.5 wt % and 1.5 wt %, more preferably between about 1.0 wt % and 1.5 wt %. The amount of glucosamine can range between about 0.5 wt % and 1.5 wt %, more preferably between about 1.0 wt % and 1.5 wt %. The total of chitosan and glucosamine is about 2.0 to 2.5 wt %. HYTb also contains enzymes such as lactic enzymes, proteases, lipases, chitinases, lactic acid, polypeptides and other carbohydrates. The specific gravity of HYTb is typically about 1.050-1.054. The average amino acid content in HYTb for certain amino acids is set forth in Table 1.

TABLE 1 Amino acid profile dry powder hydrolysates (mg per g dry weight) Dry powder Amino acid hydrolysates Aspartic acid 38 Glutamic acid 39 Serine 16 Histidine* 9 Glycine 28 Threonine* 14 Alanine 36.1 Proline 25.8 Tyrosine* 70 Arginine 22.2 Valine* 20 Methionine* 16.4 Isoleucine* 18.3 Tryptophan* 3.1 Leucine* 23 Phenylalanine* 39 Lysine* 13 Total 431 *Essential amino acids 226

HYTb is typically produced by the centrifugation of the fermentation product formed by the biodegradation product. As the biodegradation process proceeds, nutrients for the microorganisms used for the biodegradation process, e.g. HQE, are depleted and the pH drops due to the acid produced during the fermentation. This causes the microorganisms in the fermentation product to die or become dormant. Depending on the g force and time of the centrifugation of the fermentation product, such microorganisms can be found in HYTb. Accordingly, HYTb can include any one or more of the above identified components, e.g. chitosan and glucosamine, in combination with all or part of the microbial component of the fermentation process that is present when it is stopped. Alternatively, the centrifugation may proceed to a point where substantially all of the microbial component is depleted from HYTb. In such cases the microbial component can be centrifuged into the HYTc fraction. Alternatively, HYTc can be separated from HYTb by low g centrifugation. The HYTb can then be centrifuged to form a pellet of microorganisms and a microorganism free-HYTb aqueous solution.

As used herein, the term “HYTc” refers to the solid fraction obtained from the biodegradation process. The primary component of HYTc is chitin. It typically has an average molecular weight of about 2300 daltons and constitutes about 64 wt % of the composition. About 6% of HYTc contains minerals including calcium, magnesium, zinc, copper, iron and manganese, about 24 wt % protein and 6% water. It has a specific gravity of about 272 Kg/m3. The chitin in HYTc typically has microorganisms from the fermentation product associated with it. Chitinolytic microorganisms have a propensity to associate with solid chitin. This is based on the affinity of chitinolytic microorganisms for the chitin substrate. Accordingly, HYTc can also contain chitinolytic microorganisms unless steps are taken to remove them. In the case of HQE, such chitinolytic microorganisms include one or more of the chitinase and/or exochitinase producing microorganisms discussed herein. Such microorganism organisms include but are not limited to Bacillus subtilis (SILoSil® BS) Bacillus thuringiensis strains HD-1 and HD-73 (SILoSil®BT), and Trichoderma harzianum (TRICHOSIL). The chitinolytic microorganisms can be removed from the solid chitin by sterilization, pasteurization or washing the chitin with anti-microbial compounds sucg as soaps or chlorine. HYTc may also contain additional microorganisms present at the end of the biodegradation process because of the presence of residual fermentation product or the centrifugation of HYTb.

HQE Consortium

The following are the microorganisms in HQE which are believed to be involved in the biodegradation process and their known properties. In some cases the strain is identified as “Bioderpac, 2008”. Where the species is not known, the species and strain are identified as “Bioderpac, 2008”

HQE was deposited with the ATCC on Apr. 27, 2010 and given Patent Deposit Designation PTA-10861.

Bacillus subtilis ((SILoSil® BS) is a Gram positive bacterium which is mesophilic and grows at an optimum temperature between 25 and 35° C. It is aerobic and can grow in anaerobic conditions and utilizes a wide variety of carbon sources. It contains two nitrate reductases, one of which is utilized for nitrogen assimilation. It is capable of secreting amylase, proteases, pullulanases, chitinases, xilanases and lipases.

Bacillus thuringiensis (Strains HD-1 and HD-73 (SILoSil® BT)) are Gram Positive anaerobic facultative bacteria, in the form of a peritrichous flagella. Strains HD-1 and HD-73 synthetizes crystals with diverse geometric forms of proteic and insecticide activity during the spore period. Strains HD-1 and HD-73 secret exochitanases when in a chitin containing medium and can be utilized for the degradation of the crustacean residues during the production of chitooligosaccharides.

Bacillus cereus (Bioderpac, 2008) is an aerobic facultative bacterium, gram positive, and spore forming. It is mesophilic and grows at an optimum temperature between 20 and 40° C. It produces the antibiotics zwittermicin A and kanosamin.

Bacillus licheniformis (Bioderpac, 2008) is a Gram-positive, motile, spore forming and facultative anaerobic bacterium. It produces bacitracin, alpha amylases, lactamases, proteases and alkaline phosphatases. This is a non-pathogen microorganism that is associated with plants or plant materials.

Bacillus megaterium (Bioderpac, 2008) is a Gram-positive aerobic bacterium. It is considered a saprophyte. It produces glucose dehydrogenase, penicillin amydase, beta-amidase and neutral proteases.

Lactobacillus acidophilus (Bioderpac, 2008) is a member of one of the eight species of lactic acid bacteria. It is Gram positive, non-sporulating and produces lactic acid during fermentation that utilizes lactose as a principal source of carbon to produce energy. It grows with or without the presence of oxygen in an acidic medium (pH 4-5). It produces the bactereocins named lactacin B, organic acids, diacetyls and hydrogen peroxide.

Lactobacillus casei (Bioderpac, 2008) is a mesophilic, facultative anaerobic which is Gram positive and non-spore forming. It has the ability to adapt to cold temperatures. The optimum pH for its growth is 5.5. It ferments galactose, glucose, fructose, manose, manitol, and acetylglucosamine. This species can be grown over a wide range of pH and temperature. It produces amylase enzymes. It inhibits the growth of pathogenic bacteria such as H. pylori by reducing pH through the production of (1) organic acids such as acetic, proprionic or lactic acid or (2) hydrogen peroxide. This microorganism secrets bacterocines.

Pseudomonas fluorescens (Bioderpac, 2008) is a bacteria with multiple flagellum, forced aerobic and its optimal temperature for growth is between 25 and 35° C. It produces thermostable lipases and proteases. It is antagonist towards a large number of soil fungus strains. It produces secondary metabolites such as antibiotics, iron chelates, and cyanides. It produces endochitanase and cellulase in mediums with different glucose concentrations.

Trichoderma harzianum (TRICHOSIL) is a saprophyte fungus. It exhibits antibiotic action and biological competition and for this reason has biological control properties. It produces enzymes that degrade cell walls or a combination of such activities. It produces glucanases, chitinases, lipases, and extracellular proteases when it interacts with some pathogenic fungi, such as Fusarium.

Rhizobium japonicum (Bioderpac, 2008) is a nitrogen fixating bacteria. It synthesizes a hydrogenase system that participates in the recycling of hydrogen to avoid its loss during nitrogen fixation.

Azotobacter vinelandii (Bioderpac, 2008) is an aerobic bacterium. It produces nitrogenases and is capable of nitrogen fixation.

Clostridium pasteurianum (Bioderpac, 2008) is a Gram positive bacteria, anaerobic obligated. It produces ferroxine (an electron transporting protein) that acts as a direct electron donor in the reduction of proteic iron.

Proteus vulgaris (Bioderpac, 2008) Is a gram positive bacteria, anaerobic, facultative that grows at temperatures close to 23° C. It proteolytically degrades proteins to free amino acids by the enzymes it produces.

Streptomyces sp. (Bioderpac, 2008) is a Gram-positive soil bacterium. It produces multiple enzymes that metabolize diverse nutrients. It can survive significant changes in temperature, humidity and nutrient sources. The extracellular enzymes produced by these bacteria utilize chitin and chitosan as substrates at a pH of 4.5 to 6.5 and at 60° C. These are conditions generated at the beginning and at the end stages of lactic fermentation in the biodegradation process.

Nitrobacter sp. (Bioderpac, 2008) is Gram negative bacteria, aerobic, which converts nitrites into nitrates. It grows at a pH between 6 and 9 and at temperatures between 10 to 34° C. The bacteria degrade organic polymers such as chitin into compounds that are utilized by other organisms, such as Pseudomonas fluorescens ( ) and Rhizobium japonicum (Bioderpac2008).

Micrococcus sp. (Bioderpac, 2008) is a spheric Gram positive bacterium. This microorganism in association with Streptomyces sp ( ) is capable of degrading colloidal chitin derivatives.

Groups and Enzymatic Activity of Microorganisms in HQE

The biodegradation of the components of marine animals or by-products requires hydrolytic enzymes such as proteases, lipases, and chitinases. The disclosed microbial compositions contain one or more of such enzymes.

The primary group of microorganisms in HQE are Lactobacillus acidophilus (Biodepac 2008), Bacillus subtilis (SILoSil® BS), Pseudomonas fluorescens (Biodepac 2008), Bacillus licheniformis (Biodepac 2008) and Trichoderma harzianum (TRICHOSIL). These microorganisms are capable of biodegrading arthropod or arthropod by-products. One or more of the members of this primary group also have a synergistic action when combined with other microorganisms from HQE.

The first group of microorganisms includes microorganisms which cause the reduction of pH and which stabilize fermentation due to the production of organic acids and hydrogen peroxide. This group includes Lactobacillus acidophilus (Biodepac 2008) and Lactobacillus casei (Biodepac 2008). Their activity is important at the start of fermentation and during the final stages of fermentation to produce the optimum pH for the hydrolytic enzymes. Their activity also creates a culture environment which prevents the growth of unwanted microorganisms and favors the demineralization of the chitin residues. Lactobacillus acidophilus (Biodepac 2008) is a member of the primary group.

The second group of microorganisms includes microorganisms which produce extracellular enzymes. This second group includes Bacillus subtilis (SILoSil® BS), Bacillus cereus (Biodepac 2008), Trichoderma harzianum (Biodepac 2008), Rhizobium japonicum (Biodepac 2008) and Azotobacter vinelandii (Biodepac 2008). The chitin chains in arthropod or arthropod by-products are associated with protein molecules. The separation of such polymers requires the hydrolytic action obtained from the chitinolytic and proteolytic enzymes produced by these microorganisms. Both types of enzymes break the chains on the internal portion of the polymer to produce oligomers of diverse sizes. The action from these enzymes occurs in a successive manner within the intermediate and final phases of the fermentation process when the appropriate pH conditions are achieved. The microorganisms on this group and the environmental conditions they produce facilitate the liberation of pigments and the lipid fraction adhered to these residues. Bacillus subtilis (SILoSil® BS) and Trichoderma harzianum (Biodepac 2008) are members of the primary group.

The third group of microorganisms includes the microorganisms Bacillus licheniformis (Biodepac 2008), Pseudomonas flourescens (Biodepac 2008), Sptreptomyces, (Biodepac 2008) and Clostridium (Biodepac 2008). These microorganisms hydrolyze oligomers (chito-oligosaccharides and peptides) to produce chitobioses, glucosamine, and free amino acids. Bacillus licheniformis (Biodepac 2008) and Pseudomonas flourescens (Biodepac 2008) are members of the primary group.

In preferred embodiments, one or two of the first, second and third groups of microorganisms can be combined. Alternatively, all of the first, second and third groups can be combined.

A fourth group of microorganisms includes Bacillus thuringiensis (strains HD-1 and/or HD-73), Streptomyces (Bioderpac, 2008), Micrococcus (Bioderpac, 2008), Nitrobacter (Bioderpac, 2008) and Proteus vulgaris (Bioderpac, 2008). The fourth group of microorganisms can be combined with (1) the primary group of microorganisms (2) any of the first, second and third groups of microorganisms (3) the combination of one or two of the first, second and third groups of microorganisms or (4) the combination of all of the first second and third groups. The addition of this fourth group results in a synergistic effect which enhances the biodegradation process.

Each of these groups, including the primary group, are separately useful and can be combined with prior art microbial compositions to enhance their performance. In this regard, the fourth group is particularly preferred.

Table 2 sets forth some of the aforementioned combinations. Column 1 is a list of the known microorganisms in HQE that are believed to be active in the biodegradation process. Column 2 lists the microorganisms from column 1 without the microorganisms in the fourth group of microorganisms. Column 3 shows the combination of the primary microorganisms while columns 4, 5 and 6 identify the combination of microorganisms from the first, second and third groups. Column 4 is the combination of groups 1 and 2; column 5 of groups 1 and 3 and column 6 groups 2 and 3. Other useful combinations are set forth in columns 7-10.

TABLE 2 Culture Composition Microorganism 1 2 3 4 5 6 7 8 9 10 Bacillus subtilis X X X X X X X X Bacillus cereus X X X X X X Bacillus X X megaterium Azotobacter X X X X X X vinelandii Lactobacillus X X X X X X X X acidophilus Lactobacillus X X X X X X casei Trichoderma X X X X X X X X harzianum Rhizobium X X X X X X japonicum Clostridium X X X X X X pasteurianum Bacillus X X X X X X X X licheniformis Pseudomonas X X X X X fluorescens Bacillus X X X X X X thuringiensis Streptomyces X X X X X X X Nitrobacter X X X X X Micrococcus X X X X X Proteus vulgaris X X X X X

The activity of the enzymatic extracts produced by the microorganisms within HQE is complex, but has permitted the degradation of the chitinous residues of arthropods such as crustaceans. The microorganisms in HQE are activated in a successive manner according to the environment generated by the organisms used.

Methods for Identification and Isolation of Microbes in HQE

It is important to obtain pure isolates before attempting to characterize or identify a species. A few bacteria are morphologically unique and can be identified without isolation, but nearly all require isolation. The following describes the isolation of pure cultures from a mixture of species contained within HQE for Bacillus subtilis (SILoSil® BS), Bacillus cereus (Bioderpac, 2008), Bacillus licheniformis (Bioderpac, 2008), Bacillus megaterium (Bioderpac, 2008), Lactobacillus acidophilus (Bioderpac, 2008), Lactobacillus casei (Bioderpac, 2008), Pseudomonas fluorescens (Bioderpac, 2008), Trichoderma harzianum (strains HD-1 and HD-73), Rhizobium japonicum (Bioderpac, 2008), Azotobacter vinelandii (Bioderpac, 2008), Clostridium pasteurianum (Bioderpac, 2008), Proteus vulgaris (Bioderpac, 2008), Bacillus thuringiensis (SILoSil® BT), Streptomyces sp. (Bioderpac, 2008), Nitrobacter sp. (Bioderpac, 2008) and Micrococcus sp. (Bioderpac, 2008).

The first steps include:

    • (1) Dilution streaking and differential Incubations
    • (2) Identification and separation of colony types
    • (3) Narrowing down the collection, and
    • (4) Determining the initial characteristics of specific colonies and the preservation of Isolates.

Dilution Streaking and Differential Incubations

Once a specimen is removed from the HQE sample it should be cultured immediately. Any liquid sample must be thoroughly vortexed prior to preparation of the plates because non-motile bacteria may settle to the bottom of a sample if they are associated with particulate matter. Unfortunately, bacteria do not segregate homogeneously and replicate samples from the same mixture may contain different quantities of bacteria. The object of thorough vortexing and subsequent dilution streaking is to spread out individual CFUs (Colony Forming Units) so as to obtain discrete colonies that may be sub-cultured.

All of the mentioned microorganism can be separately subjected to the following procedures for identification and isolation with the exception of Nitrobacter sp. which will be explained separately.

A loop full of thoroughly vortexed sample from HQE is obtained aseptically and applied to one edge of the agar surface. With back and forth movements about one-fourth of the surface should be streaked while drawing the loop toward the middle of the plate. Streaking should not break the surface of the agar, and there should be (20 or more) streak lines produced. To dilute or spread out the sample the loop must be flamed to destroy all viable material, touched to a clean part of the agar to cool it, then streaks made perpendicular to the original inoculum, overlapping that part of the plate once or twice. The second section should cover one-half of the remaining sterile surface. This spreads out a small part of the original inoculum possibly diluting it sufficiently to result in the appearance of individual colonies after incubation. A third section is then streaked perpendicular to the second section, flaming and cooling the loop and overlapping the previous section as before, to further dilute the inoculum.

In the preparation of isolates from each batch of product, the next phase is to prepare replicate streak plates and incubate them under different conditions in an inverted position, to maximize opportunities to differentiate colony types for Bacillus subtilis (SILoSiI® BS), Bacillus cereus (Bioderpac, 2008), Bacillus licheniformis (Bioderpac, 2008), Bacillus megaterium (Bioderpac, 2008), Lactobacillus acidophilus (Bioderpac, 2008), Lactobacillus casei (Bioderpac, 2008), Pseudomonas fluorescens (Bioderpac, 2008), Trichoderma harzianum (TRICHOSIL), Rhizobium japonicum (Bioderpac, 2008), Azotobacter vinelandii (Bioderpac, 2008), Clostridium pasteurianum (Bioderpac, 2008), Proteus vulgaris (Bioderpac, 2008), Bacillus thuringiensis (strains HD-1 and HD-73, SILoSil®BT), Streptomyces sp. (Bioderpac, 2008), and Micrococcus sp. (Bioderpac, 2008). The temperature of incubation is varied (typically 25, 30, and 37° C.) and incubated under both aerobic and anaerobic conditions. This approach increases the chances of separating individual species, since different species/bacterium have different optimum temperature ranges for growth and different requirements for oxygen. The aerobic organisms should be checked after one day of incubation, since some of our featured bacteria being tested grow very fast and crowd out the others.

Approaches to Identifying and Separating Colony Types

A dissecting microscope with a trans-illuminator can be used to distinguish individual colonies. Plates should remain inverted during examination. Colonies are distinguishable by size, shape, opacity, and texture regarding afore the mentioned microorganisms. Upon examination, it is best to indicate the colonies to be sampled by putting a small mark next to them on the bottom of the plate. It will be necessary to turn over the plate lid to collect colony material. Caution should be taken to carefully insert the sterile loop only for the time it takes to obtain an inoculum.

For color, surface characteristics and profile (raised, flat, etc.), it is necessary to examine the colonies with incident light, through the transparent lid. Lids should be left on otherwise the plates will become contaminated. Before turning the plate remove and invert the lid to remove the moisture. The old lid should be replaced with a new one for viewing.

In the event two colonies overlap and still can be distinguished, then at least two colonies are present. Colonies usually have a fairly simple, uniform texture. If an area resembles a mosaic, there are probably at least two species. Each unique type of colony should be sampled by taking a needle inoculum and performing a three way dilution streak on a fresh plate. Care should be taken to sample only the colony of interest. Incubate each new streak plate under aerobic conditions at the temperature which the original plate was incubated.

Species will exhibit temperature optima, indicated by faster growth and/or larger colonies at temperatures closest to ideal. Any colony that is sampled from an anaerobically incubated plate will likely be a facultative anaerobe.

Narrow Down the Collection

Duplicates of the same species and strain are likely to be isolated from different streak plates. Many different species and different strains of the same species produce very similar colony types. To narrow the number of isolates to unique species/strains, culture suspected duplicate isolates on the same plate. On two thirds of the surface conduct two “mini-dilutions” to obtain individual colonies for each culture, and on the remaining one-third mix them. After incubation, if the two isolates grow on the same plate and/or mixed inoculum produce two distinguishable colony types, two unique isolates have been identified.

Initial Characterization of Colonies and Preservation of Isolates

Most of the characteristic of the organisms under consideration should be determined using incident, not transmitted, light.

Once an isolate is obtained and purity established by both colony examination and microscopic examination, an agar slant tube should be inoculated and incubated at an appropriate temperature with the cap loose to allow gas exchange. After growth appears, the culture should be described, the cap tightened, and the tube kept at room temperature as a source of pure culture for assays.

In addition to gross descriptive characterization, a young (<18 h) culture should be gram stained and the results recorded including cell shape and size, sheaths or capsules if evident, and any evidence of spores or similar structures. Relationship to oxygen is the next step with which to narrow possible categories. After that, it is this particular combination of Gram stain results, cell type, and relationship to oxygen that determines the next series of steps toward characterizing the isolate.

The Deletion and Counting of Nitrobacter sp. Population in the Product

There have been several studies on the metabolism, survival, and growth of nitrite oxidizers in pure cultures and on their nitrifying activity in various environments, but fewer studies have dealt with natural Nitrobacter population. Although the biological conversion of nitrite to nitrate is a well known process, studies and procedures of the Nitrobacter population are currently hampered by inadequate methods of detection and counting.

This failure is due in part to the unfavorable physiological characteristics of these bacteria, namely slow growth, small biomass, and susceptibility of cultures to contamination. There is a way to count Nitrobacter population in the soil but it is time consuming and selective.

Detailed Description of the Growth Process

Bacillus cereus (Bioderpac, 2008), Bacillus megaterium (Bioderpac, 2008),

Bacillus subtilis (SILoSil® BS) and Bacillus licheniformis (Bioderpac, 2008)

Media ingredient: purified water and plate medium nutrient agar.

Procedure: (1) place 0.1 ml liquid sample of HQE in 9.9 ml of purified water, (2) commence a serial dilution range up to 1-10, (3) incubate a replicate plate series with 1 ml of the dilution range, the plate medium is nutrient agar, (4) incubate plates at 37° C. for 24-48 hours, (5) colony forming units should be 1,000,000 per 1 ml of product.

Pseudomonas fluorescens and Proteus vulgaris

Media ingredient: purified water and plate medium nutrient agar.

Procedure: (1) place 0.1 ml liquid sample of HQE in 9.9 ml of purified water, (2) commence a serial dilution range up to 1-10, (3) incubate a replicate plate series with 1 ml of the dilution range, the plate medium is nutrient agar, (4) incubate plates at 37° C. for 24-48 hours, (5) colony forming units should be 1,000,000 per 1 ml of product.

Lactobacillus acidophilus and Lactobacillus casei

The Agar M.R.S. was developed by Man, Rogosa and Sharpe to provide means that could demonstrate a good growth of lactobacillus and other lactic acid bacteria. The culture medium allows an abundant development of all the species of lactobacillus. Peptona and glucose constitute the nitrogen source, carbon and of other necessary elements for the bacterial growth. The sorbitan monoleate, magnesium, manganese and acetate, contribute cofactors and can inhibit the development of some microorganisms. The ammonium citrate acts like an inhibiting agent of the growth of negative Gram bacteria. See Table 3.

TABLE 3 Formula (in grams per liter) Instructions Proteose peptone No 3 10.0 Suspend 64 g of the medium in a liter Meat extract 8.0 of distilled water. Let it rest 5 minutes Yeast extract 4.0 and mix warming up to boiling point Glucose 20.0 during 1 or 2 minutes. Sterilize in Sorbitan Monoleate 1 ml sterilizer during 15 minutes to 121° C. Dipotassium Phosphate 2.0 Sodium Acetate 5.0 Ammonium Citrate 2.0 Magnessium Sulfate 0.2 Manganese Sulfate 0.05 Agar 13.0 Final pH: 6.4 ± 0.2

Media ingredient: purified water and plate medium nutrient agar M.R.S substrate.

Procedure: (1) place 0.1 ml liquid sample of HQE in 9.9 ml of purified water, (2) commence a serial dilution range up to 1-10, (3) incubate into aerobic chamber with 5-10% CO2 a replicate plate series with 1 ml of the dilution range, the plate medium is agar M.R.S., (4) incubate plates at 33-37° C. for 72 hours or 30° C. for 5 days, (5) colony forming units should be 1,000,000 per 1 ml of product.

Results. Colony forming units should be 1,000,000 per 1 ml of product.

Characteristics of the colonies: generally small, white-grayish, smooth or rough.

Characteristics of the medium: Prepared medium is yellow.

Lactobacillus Identification:

TABLE 4 Growth at Acid NH3 Growth in 4% 15° C. 45° C. la su sal mn so xi Arginine NaCl broth L. acidophilus − + + + + − − − − − L. casei + V +/− +/− + + + − − +

Azotobacter vinelandii (Bioderpac, 2008)

Media ingredient: purified water and plate medium nutrient agar substrate (Burk's, Asbhy, Jensen's).

Procedure: (1) place 0.1 ml liquid sample of HQE in 9.9 ml of purified water, (2) incubate this solution at 25° C. for 48 hours, (3) commence a serial dilution range up to 1-10, (4) incubate a replicate plate, with nutrient agar substrate, series with 1 ml of the dilution range, the plate medium is nutrient agar (5) incubate plates at 25° C. for 48-72 hours, (6) colony forming units should be 1,0000,000 per 1 ml of product.

Clostridium pasteurianum (Bioderpac, 2008)

Media ingredient: phosphate buffered water and plate medium standard methods agar substrate (TYG).

Procedure: (1) place 0.1 ml liquid sample of HQE in 9.9 ml of phosphate buffered water, (2) make appropriate serial dilutions (3) plate appropriate aliquot for desired dilution into Petri dishes, (4) add tempered standard methods agar and mix of dish, (5) place inverted dried plates into anaerobic chamber, (6) incubate plates at 35-37° C. for 48-72 hours, (7) after incubation period, removed plates from anaerobic chamber and count plates, record dilutions used and the total number of colonies counted for each dilution, (8) colony forming units should be 1,000,000 per 1 ml of product.

The identification of this species of Clostridium uses a typical microscopic morphology of a colony which allows a fast and presumptive identification of some species of Clostridium frequently isolated. In addition, along with the use of simple biochemical tests such as the study of the production of lecitinase and lipase in agar egg yolk, the hydrolysis of the gelatin and urea and the production of indol through the fast method (p-dimetil-amino-cinnamaldehide), constitute an easy and inexpensive method for the identification, even definitive, for some of them.

Micrococcus sp. (Bioderpac, 2008)

Media ingredient: purified water and plate medium nutrient agar.

Procedure: (1) place 0.1 ml liquid sample of HQE in 9.9 ml of purified water, (2) commence a serial dilution range up to 1-10, (3) incubate a replicate plate series with 1 ml of the dilution range, the plate medium is nutrient agar, (4) incubate plates at 37° C. for 24 hours, (5) colony forming units should be 1,000,000 per 1 ml of product.

If positive Gram coccos are found, perform antibiotic sensitivity tests. Micrococcus is sensitive to Bacitracin and resistant to furazolidone.

Rhizobium japonicum (Bioderpac, 2008)

Media ingredient: purified water and plate medium ALM (agar yeast extract mannitol).

Procedure: (1) place 0.1 ml liquid sample of HQE in 9.9 ml of purified water, (2) commence a serial dilution range up to 1-10, (3) incubate a replicate plate series with 1 ml of the dilution range, the plate medium is ALM (agar yeast extract mannitol), (4) incubate plates at 28° C. for 96 hours, (5) colony forming units should be 1,000,000 per 1 ml of product.

To confirm Rhizobium japonicum (Bioderpac, 2008), the isolated colony is used to infect a leguminosae aseptically to cause the formation of nodules.

Trichoderma harzianum (TRICHOSIL)

Media ingredient: purified water and malt extract agar medium (2% wt/vol) substrate supplemented with chloramphenicol, streptomycin sulfate, and nystatin.

Procedure: (1) place 0.1 ml liquid sample of HQE in 9.9 ml of purified water, (2) commence a serial dilution range up to 1-10, (3) incubate a replicate plate series with 1 ml of the dilution range, the plate medium is malt extract agar (4) incubate plates at 25° C. for 4 days, (5) colony forming units should be 1,000,000 per 1 ml of product.

Bacillus thuringiensis (Strains HD-1 and HD-73 (SILoSil® BT))

Media ingredient: purified water and plate Superbroth medium agar substrate supplemented with 2 g/litro de D-glucosa and 50 μg/ml erythromycin.

Procedure: (1) place 0.1 ml liquid sample of HQE in 9.9 ml of purified water, (2) commence a serial dilution range up to 1-10, (3) incubate a replicate plate series with 1 ml of the dilution range, the plate medium is Superbroth agar (4) incubate plates at 28° C. for 10-14 days, (5) colony forming units should be 1,000,000 per 1 ml of product.

Streptomyces sp. (Bioderpac, 2008)

Media ingredient: purified water and plate actinomycete isolation agar medium.

Procedure: (1) place 0.1 ml liquid sample of HQE in 9.9 ml of purified water, (2) commence a serial dilution range up to 1-10, (3) incubate a replicate plate series with 1 ml of the dilution range, the plate medium is actinomycete isolation agar (4) incubate plates at 28° C. for 2-3 days, (5) colony forming units should be 1,000,000 per 1 ml of product.

Nitrobacter sp. (Bioderpac, 2008)

Media ingredient: purified water and plate medium nutrient agar substrate.

Procedure: (1) place 0.1 ml liquid sample of HQE in 9.9 ml of purified water, (2) commence a serial dilution range up to 1-10, (3) incubate a replicate plate series with 1 ml of the dilution range, the plate medium is plate nutrient agar substrate, (4) incubate plates at 30° C. for 10-14 days.

Biodegradation Process

In a preferred embodiment, the marine arthropod is a crustacean and the preferred crustacean is shrimp. Shrimp by-product comprises shrimp cephalothorax and/or exoskeleton.

In the biodegradation process, it is preferred that the fermentation be facultative aerobic fermentation. It is also preferred that the fermentation is carried out at a temperature of about 30° C. to 40° C. The pH is preferably less than about 6, more preferably less than about 5.5. However, the pH should be maintained above about 4.3. The fermentation is carried out for about 24-96 hours. In some embodiments, the fermentation is carried out for about 24-48 hours and more preferably 24-36 hours. These fermentation times are far shorter than the typical prior art fermentation times of 10 to 15 days to achieve substantially the same amount of digestion, albeit without detectable formation of chitosan and glucosamine.

The separation of the mixture is preferably by centrifugation. (e.g. about 920 g). Gravity separation can also be used but is not preferred because of the time required to achieve separation.

The mixture separates in to three fractions: solid, aqueous and lipid. The solid fraction comprises chitin and is designated HYTc. The aqueous fraction comprises protein hydroysate, amino acids, chitosan and glucosamine and is designated HYTb. The lipid fraction comprises sterols, vitamin A and E and carotenoid pigments such as astaxanthine.

Any of the microbial compositions identified herein can be used in the biodegradation process, In some embodiments it is preferred that HQE be used in the biodegradation process. In other embodiments, it is preferred that HYTb be added to HQE or the fermentation broth. As described above, HYTb contains amino acids, chitosan, glucosamine and trace elements including calcium, magnesium, zinc, copper, iron and manganese. HYTb also contains enzymes such as lactic enzymes, proteases, lipases, chitinases, lactic acid, polypeptides and other carbohydrates. HYTb can also contain dormant microorganisms from a prior biodegradation process. Such microorganisms can become reactivated and, in combination with HQE, contribute to a more robust biodegradation process as compared to when HQE is used by itself as otherwise described herein

More particularly, the process includes the following steps:

    • a. Activation of the microbial cells in a sugar base solution to enhance its growth and the biomass formation.
    • b. Milling of the shrimp by-products (cephalthorax and exosqueleton) to make a homogeneous paste.
    • c. Homogeneous mixing of the shrimp by-product paste with at least 10% of the activated inoculum.
    • d. Adjustment of the pH values to less than 6.0 in the mixture using a citric acid solution to inhibit the growth of micro organisms and to promote the development of microbial cells that constitute the inoculum.
    • e. Fermentation of the mixture in a non continuous agitated system at temperatures within a range of 30 to 40° C. at least for at least 96 hours maintaining pH at less than 5.0. The pH is monitored periodically. If the pH rises above 5.0, a citric acid buffer is added in an amount to maintain the pH below 5.0.
    • f. Centrifugation of the ferment to separate the three principal fractions: chitin, liquid hydrolysate and pigmented paste.
    • g. Rinsing of the crude chitin and recollection of the rinse water to recuperate fine solids or minerals.
    • h. Drying of the chitin and storage.
    • i. Drying and storage of the liquid hydrolysate.
    • j. The pigmented paste (lipid fraction) is stored in closed recipients for conservation.

The process and operational fundamentals are better understood with reference to FIG. 1 and the following detailed description.

Activation of Microbial Cells

A microbial composition as disclosed herein is used as inoculum. The inoculum of HQE has a concentration of microbes of about 2.5 to 3.0% (w/v). HQE is activated by dilution to 5% in sugar cane solution (3.75% final concentration of sugar cane), and incubated at 37° C. for 5 days. HYTb (10 ml per liter of culture) is preferably added to provide a source of minerals and naturally derived amino acids. The cellular growth of the microorganisms was estimated by optical density measured at 540 nm. The activation is complete at an optical density of about 1.7. The concentration of microbes after activation is about 1.9 to 3.0% (w/v).

Preparation of Samples

The shrimp by-products samples are obtained from shrimp processing plants. Slightly thawed and minced residue (1500 g by batch) is mixed with 99 grams of sugar cane (final concentration 6.6% wt %) and 85.5 ml of activated HQE 5% (v/w) (optical density of cell=1.7). Then the pH is adjusted to 5.5 using 2 M citric acid.

Fermentation Control

The mixture is incubated at 36° C. with a non continuous agitation for 96 h. During the fermentation process, the pH is monitored by using a potentiometer, and the total titratable acidity (TTA, %) was determined by titration with 0.1 N NaOH until a pH of 8.5 is obtained. The TTA is expressed as a percentage of lactic acid.

Conditions of Separation

The fermentation product is a viscous silage which has an intense orange color, due to the astaxanthine presence. The ensilage is centrifuged (5° C.) at 1250 rpm (930 g) for 15 min to obtain the chitin, the liquid hydrolysates, and the pigment paste. The upper phase (pigment paste) is separated manually. The liquid hydrolysates are separated by decantation, and the sediment that constitutes the raw chitin is washed with distilled water to separate fine solids. The resulting liquid is collected and dried. The raw chitin, liquid hydrolysates and fine solids are dried at 60° C. All the fractions are stored to protect them from light.

The above protocol was carried out using HQE in three fermentation batches in duplicate as set forth in the following examples.

Example 1 Fermentation Control by Measurement of pH and Total Titratable Acidity (TTA, %)

The average initial values of pH and TTA were 7.31±0.10 and 0.53±0.09, respectively. As shown in FIG. 2, the pH was initially reduced to 6.5 by the addition of 2 M citric acid. Then, due to proteolysis and the release of ammonium, the pH increased again to 7.11±0.08 during the first 2 h, and later, the pH diminished by 28% (up to 5.28±0.01) during the 12 hours of fermentation. At approximately 24 hours of fermentation, the final pH was 4.57±0.15. In parallel to the decrease in pH a similar behavior was observed in the mean values of the TTA. During the first 2 hours of the average values of TTA were 1%, and then these values increased gradually to an average value of 3.33±0.23 at 24 hours, as shown in FIG. 2.

Example 2 Products of the Fermentation and Chemical Composition

After the fermentation process, the silage was centrifuged to separate the three principal products (chitin, liquid hydrolysate, and pigment paste). The other product, the fine solids were retained with the raw chitin wash. Table 5 shows the proportion recovered in each fraction. In dry weight, the bigger fraction corresponded to the liquid hydrolysate (55%), then the fine solids (29%), raw chitin (10%) and pigment paste (5%). In the fermented batch, the average value of dry weight was 32% (481.1±5.6 g).

Table 6 shows the chemical characterization of each of the four main products that were obtained through fermentation. The chitinous product (chitin) shows a partial demineralization reflected as ash. It also reveals high protein content (42.34%) quantified in the liquid hydrolysates. This facilitated the recovery of a pigment paste, consisting mainly of total lipids (42.67%), and produced a fraction abundant in ash (16.72%) in the fine solids.

TABLE 5 Products separated from fermentation Lipidic Dry matter Raw chitin Liquid hydrolysate paste Fine solids (g) (g) (g) (g) (g) 480.0 48.0 264.4 22.9 141.2 487.5 50.2 268.8 24.0 140.8 475.7 51.0 265.7 23.7 131.7 481.1 ± 5.6 49.5 ± 2.4 266.3 ± 4.6 23.3 ± 0.5 141.9 ± 5.5

TABLE 6 Chemical composition (dry weight) of the fermentation products Products % Protein % Ash % Total lipid Raw chitin 18.12 ± 0.15 4.36 ± 0.26 2.02 ± 0.46 Liquid hydrolysate 42.34 ± 0.03 7.96 ± 0.16 4.28 ± 0.28 Lipidic paste 30.80 ± 0.25 5.11 ± 0.16 42.67 ± 0.63  Fine solids 31.62 ± 0.10 16.72 ± 0.37  Nd

Example 3 Amino Acid Profile in the Dry Powder Hydrolysates

The amino acid content of dried hydrolysate was determined as described by Lopez-Cervantes et al., “Analysis of free amino acids in fermented shrimp waste by high-performance liquid chromatography”, Journal of Chromatography A, volume 1105, 1 (2006). Table 6 shows the total amino acid profile of the dry powder hydrolysates. The proportion of essential amino acids was of 52.5% to dry powder hydrolysates.

TABLE 7 Amino acid profile dry powder hydrolysates (mg per g dry weight) Amino acid Dry powder hydrolysates Aspartic acid 38 Glutamic acid 39 Serine 16 Histidina* 9 Glycine 28 Threonine* 14 Alanine 30 Proline 8 Tyrosine* 70 Arginine 18 Valine* 20 Methionine* 4 Isoleucine* 15 Leucine* 23 Phenylalanine* 39 Lysine* 13 Total 394 * Essential amino 207 acids

Example 4 Quantification of Glucosamine in Raw Chitin

In the chitin, the content of glucosamine was quantified as an index of purity. The contents of glucosamine in chitin were 516, 619 and 640 mg per g (dry weight), these values correspond to the results of three fermentation batches carried out in duplicate. Therefore, the average amount of glucosamine in this study was 591 mg per g dry weight of chitin. The method for quantification of glucosamine was reported by Lopez-Cervantes et al., “Quantitation of glucosamine from shrimp waste using HPLC” Journal of Chromatographic Science, volume 45, 1 (2007).

Example 5 Contents of Astaxanthin and Profile of Fatty Acids in Pigment Paste

Astaxanthin is the main pigment in the lipidic paste obtained from fermented shrimp waste. The content of astaxanthin ranged from 1.98 to 2.25 mg g−1 of dry lipidic paste, and the average is 2.11 mg g−1 of dry lipidic paste. Astaxanthin was determined by a version of the method of Lopez-Cervantes et al., “Quantification of astaxanthin in shrimp waste hydrolysate by HPLC” Biomedical Chromatography, volume 20, 981 (2006).

In the pigment paste, fourteen fatty acids were identified. The palmitic acid (C16:0), and the oleic acid (C18:1n9) were found in higher quantity.

Claims

1. A microbial composition comprising ATCC Patent Deposit Designation PTA-10861

2. A microbial composition comprising (a) one or more lactic acid bacteria (LAB) and (b) one or more microorganisms selected from the group of genera consisting of Bacillus, Azotobacter, Trichoderma, Rhizobium, Clostridium, Pseudomonas, Streptomyces., Micrococcus, Nitrobacter and Proteus.

3. The microbial composition of claim 2 wherein said LAB is selected from the genera consisting of Lactobacillus, Pediococcus, Lactococcus, and Streptococcus.

4. The microbial composition of claim 2 wherein said LAB is selected from the group consisting of Lactobacillus acidophilus and Lactobacillus casei.

5. The microbial composition of claim 2 wherein said LAB is selected from the group consisting of Lactobacillus acidophilus (Bioderpac, 2008) and Lactobacillus casei (Bioderpac, 2008).

6. The microbial composition of claim 2 wherein said Bacillus is selected from the group consisting of Bacillus subtilis, Bacillus cereus, Bacillus megateriu, Bacillus licheniformis and Bacillus thuringiensis, said Azotobacter is Azotobacter vinelandii, said Trichoderma is Trichoderma harzianum, said Rhizobium is Rhizobium japonicum, said Clostridium is Clostridium pasteurianu and said Pseudomonas is Pseudomonas fluorescens.

7. The microbial composition of claim 2 wherein said Bacillus is selected from the group consisting of Bacillus subtilis (SILoSil® BS), Bacillus cereus (Bioderpac, 2008), Bacillus megaterium (Bioderpac, 2008), Bacillus licheniformis (Bioderpac, 2008) and Bacillus thuringiensis (strains HD-1 and HD-73 (SILoSil° BT)), said Azotobacter is Azotobacter vinelandii (Bioderpac, 2008), said Trichoderma is Trichoderma harzianum (TRICHOSIL), said Rhizobium is Rhizobium japonicum (Bioderpac, 2008), said Clostridium is Clostridium pasteurianu (Bioderpac, 2008) and said Pseudomonas is Pseudomonas fluorescens (Bioderpac, 2008).

8. The microbial composition of claim 2 wherein at least one of said Bacillus, Azotobacter, Trichoderma, Rhizobium, Clostridium, Pseudomonas, Streptomyces., Micrococcus, Nitrobacter and Proteus is a chitinolytic strain.

9. A biodegradation process comprising:

mixing a marine animal or marine animal by-product with the microbial composition of any of claims 1 through 11 to form a mixture;
fermenting said mixture; and
separating said mixture into solid, aqueous and lipid fractions.

10. The process of claim 9 wherein said marine animal is a marine arthropod.

11. The process of claim 10 wherein said marine arthropod is selected from the group consisting of shrimp, crab and krill.

12. The process of claim 9 wherein said marine animal is fish.

13. The process of claim 9 wherein said microbial composition comprises ATCC Patent Deposit Designation PTA-10861.

14. The process of claim 9 wherein said fermenting is by facultative aerobic fermentation.

15. The process of claim 9 wherein said separating is by centrifugation.

16. The process of claim 9 wherein said fermenting is at a temperature of about 30° C. to 40° C.

17. The process of claim 16 wherein said fermenting is carried out at a pH between about 4.3 and 5.0

18. The process of claim 16 wherein said fermentation is carried out for about 24-96 hours.

19. The process of claim 14 wherein said aqueous fraction comprises amino acids, chitosan and glucosamine

20. The process of claim 19 wherein said aqueous fraction further comprises trace elements.

21. The aqueous fraction made according to claim 19 or 20.

22. The process of claim 12 wherein said solid fraction comprises chitin.

23. The solid fraction made according to claim 22.

24. A composition comprising HYTb.

25. A composition comprising HYTc.

Patent History
Publication number: 20120315668
Type: Application
Filed: Jun 25, 2012
Publication Date: Dec 13, 2012
Applicant: Agrinos AS (Lysaker)
Inventors: Jaime López-Cervantes (Obregon), Dalia Isabel Sánchez-Machado (Obregon), Karl Reiner Fick Rochin (Los Naranjos)
Application Number: 13/519,112
Classifications
Current U.S. Class: Process Involving Micro-organisms Of Different Genera In The Same Process, Simultaneously (435/42); Mixed Culture (435/252.4)
International Classification: C12P 39/00 (20060101); C12N 1/20 (20060101);