Abstract: The invention discloses a method for extracting phenylalanine from the broths obtained by enzymatic processes; this method consists in flocculating and filtering the broth, concentrating the filtrate followed by filtering off the resulting cinnamic acid, decolorating and concentrating the filtrate to obtain phenylalanine crystals at a very pure degree.

Abstract: A process for the preparation of the N-L-.alpha.-aspartyl-L-phenylalanine 1-methyl ester (aspartame) which is characterized by adding phosphoric acid and a lower alkyl alcohol to the reaction mixture containing N-formyl .alpha.-L-aspartyl- and .beta.-L-aspartyl-L-phenyl-alanine methyl ester and only one of the resultant deformylated isomers, i.e. aspartame phosphate precipitates.The .alpha.-isomer phosphate is collected by filtration and converted to free aspartame by treatment with a base.

Abstract: Disclosed is a process for purifying Tylosin by selective adsorption of the fermentation broth previously brought to 7.5-10.0 pH on polymeric resins and by subsequent deadsorption of the purified product with a aqueous-alcoholic or aqueous-acetonic solution and further purification of the eluate by filtration through macroreticular weak anion resins.

Abstract: A process for deformylation and separation of N-formyl-L- .alpha.-aspartyl-L-phenylalanine methyl ester from a mixture containing both .alpha. and .beta. isomers thereof, which comprises admixing with said isomeric mixture hydrogen peroxide and an organic acid.

Abstract: A process for preparing 6-APA and 7-ACA and derivatives therefore is disclosed wherein a penicillin or cephalosporin substrate is reacted with a molar excess of an oxalyl halide of the formula halCOCOhal whereby the COOM group of the substrate, wherein M represents hydrogen, metal or ammonium cations, is transformed into the group COOCOCOhal.

Abstract: Cephalosporin C is recovered from its fermentation broth by in situ formation of N-(p-nitrobenzoyl)cephalosporin C which is extracted therefrom and converted to 7-amino-cephalosporanic acid.

Abstract: Process for preparing an .alpha.-aminoalcohol of formula ##EQU1## wherein R represents hydrogen or alkyl of from 1 to 5 carbon atoms, which comprises contacting a compound of formula ##EQU2## wherein R has the same meaning as above, with an alcohol of formula R'-OH wherein R' represents benzyl or the group ##EQU3## in which R" and R"' are independently selected from hydrogen and alkyl of from 1 to 4 carbon atoms in an organic solvent, in the presence of a basic catalyst, at from about 140.degree. to about 170.degree.C., treating the obtained product of formula ##EQU4## wherein R and R' have the above meanings, with at least an equimolecular amount of a p-toluene-sulfonyl halide, at from about -5.degree. to about 20.degree.C. in the presence of a tertiary organic nitrogen-containing base and reacting in a closed system the resulting compound of formula ##EQU5## wherein R and R' are as above defined, with an excess of gaseous ammonia, in the presence of an inert organic solvent, at from about 95.degree.