Abstract: The present disclosure relates to a gene recombinant vector of a collagenase, comprising a collagenase gene, wherein an amino acid sequence of a collagenase encoded by the collagenase gene is shown in SEQ ID NO. 1; moreover, a genetically engineered strain of the collagenase and a preparation method of the collagenase are also disclosed; and the collagenase prepared according to the invention is capable of degrading a bone collagen, and improving a yield of a low-molecular-weight bone collagen peptide.

Abstract: The present disclosure relates to a gene recombinant vector of a collagenase, comprising a collagenase gene, wherein an amino acid sequence of a collagenase encoded by the collagenase gene is shown in SEQ ID NO. 1; moreover, a genetically engineered strain of the collagenase and a preparation method of the collagenase are also disclosed; and the collagenase prepared according to the invention is capable of degrading a bone collagen, and improving a yield of a low-molecular-weight bone collagen peptide.

Abstract: The present disclosure discloses a novel magnesium phosphate-alkali activated composite cementitious material with rapid hardening, early strength, and high water resistance and a preparation method thereof. The composite cementitious material is a mixture system of a magnesium phosphate cementitious material interweaving and coexisting with an alkali-activated cementitious material, where the alkali-activated cementitious material is prepared by alkali activation of an activatable mineral using a hydration product of a high-alkalinity magnesium phosphate cementitious material prepared from an alkaline hydrophosphate. The composite cementitious material obtained ensures excellent mechanical properties while actively converting part of or all of air-hardening material components into a hydraulic material, so that the problem of poor water resistance of the magnesium phosphate cementitious material can be effectively solved.

Abstract: A hairpiece with identical front and back appearances includes a first hair layer, a support layer, and a second hair layer, where the support layer is located between the first hair layer and the second hair layer; and the first hair layer and the second hair layer are fixedly connected to the support layer. In the hairpiece, since the front and back sides of the hairpiece have the same appearance, the user can wear the hairpiece directly, without bothering to distinguish the front and back sides. This avoids the risk of reversing the front and back sides of the hairpiece, and improves the aesthetics and delicacy of the hairpiece.

Abstract: A hairpiece accessory with a light, thin and soft net bottom includes a net bottom and hair wefts fixed onto the net bottom, where the hair wefts are arranged in rows, and each row of the hair wefts includes a plurality of short hair wefts, the short hair wefts are spaced evenly, and short hair wefts in every two adjacent rows are staggered. In the hairpiece accessory, the staggered hair wefts cover the entire net bottom, which ensures the appearance quality, and avoids the problem of large thickness and hardness of the net bottom, thereby making the hairpiece accessory soft and improving the wearing comfort.

Abstract: The present invention discloses a preparation method of instant bone milk, including: washing edible animal bones and then crushing, adding a certain amount composite effect enhancer, performing two high pressure hydrolysis-instantaneous pressure relief in high pressure hydrolysis chamber, collecting liquid-phase materials, performing centrifugation for degreasing, wet sieving, homogenizing, spray drying to obtain powdered instant bone milk. A device for preparation method of instant bone milk comprises a high-pressure hydrolysis tank, a grading conveying pipe and a gas-liquid separator. The instant bone milk prepared by the present invention has stable chemical structure, uniform particle size distribution and regular normal distribution, high protein solubility and good solution stability. And the preparation method has simple process, low cost equipment and good versatility.

Abstract: The invention discloses a liquefaction device of hard bone, comprising: outer cavity having upper end detachably sealed with upper cover, and lower end openable/closable sealed with lower sealing cover, first liquefaction cavity coaxially slidably disposed in outer cavity, stainless steel cage disposed coaxially in first liquefaction cavity, second liquefaction cavity fixed to outer sidewall of outer cavity such that lower end portion of outer cavity is located in second liquefaction cavity. The invention also provides a method for co-production of bone collagen polypeptide and ultrafine bone powder based on liquefaction device, including: selecting hard bones, crushing; performing first-stage and second-stage liquefaction to obtain liquid phase and solid phase; centrifuging, concentrating, drying liquid phase to obtain bone collagen polypeptide; drying, coarsely and superfine pulverizing solid phase to obtain ultrafine bone powder.

Abstract: The present invention discloses a preparation method of instant bone milk, including: washing edible animal bones and then crushing, adding a certain amount composite effect enhancer, performing two high pressure hydrolysis-instantaneous pressure relief in high pressure hydrolysis chamber, collecting liquid-phase materials, performing centrifugation for degreasing, wet sieving, homogenizing, spray drying to obtain powdered instant bone milk. A device for preparation method of instant bone milk comprises a high-pressure hydrolysis tank, a grading conveying pipe and a gas-liquid separator. The instant bone milk prepared by the present invention has stable chemical structure, uniform particle size distribution and regular normal distribution, high protein solubility and good solution stability. And the preparation method has simple process, low cost equipment and good versatility.

Abstract: The invention discloses a liquefaction device of hard bone, comprising: outer cavity having upper end detachably sealed with upper cover, and lower end openable/closable sealed with lower sealing cover, first liquefaction cavity coaxially slidably disposed in outer cavity, stainless steel cage disposed coaxially in first liquefaction cavity, second liquefaction cavity fixed to outer sidewall of outer cavity such that lower end portion of outer cavity is located in second liquefaction cavity. The invention also provides a method for co-production of bone collagen polypeptide and ultrafine bone powder based on liquefaction device, including: selecting hard bones, crushing; performing first-stage and second-stage liquefaction to obtain liquid phase and solid phase; centrifuging, concentrating, drying liquid phase to obtain bone collagen polypeptide; drying, coarsely and superfine pulverizing solid phase to obtain ultrafine bone powder.