摘要:
2-Amino-(2)-thiazoline-4-carboxylic acid is prepared by dehydrochlorinating S-(.beta.-carboxy-.beta.-chloroethyl) isothiourea by adding it to an aqueous medium maintained at a pH ranging from 5.5 to 7.5 with an alkali.
摘要:
A method for producing L-cysteine and/or L-cystine which comprises:A. holding 2-amino-thiazoline-4-carboxylic acid in an aqueous solution at a pH of 5 to 11 in the presence of an effective amount of enzyme produced by a microorganism; said enzyme being capable of converting the 2-amino-thiazoline-4-carboxylic acid to L-cysteine and/or L-cystine, and said microorganism being capable of growing in a medium containing 2-amino-thiazoline-4-carboxylic acid as a nitrogen source; andB. recovering the L-cysteine and/or L-cystine formed from said aqueous solution.
摘要:
A process for producing .alpha.-L-aspartyl-L-phenylalanine methyl ester or its hydrohalide, which comprises subjecting 3-benzyl-6-carboxymethyl-2,5-diketopiperazine to partial hydrolysis with a strong acid in a solvent mixture of methanol and water.
摘要:
A decarboxylase in cells of Micrococcus strains converts tryptophan, phenylalanine, and substitution products thereof to the corresponding phenyl- and indolylethylamines. The enzyme can be recovered in pure state from the microorganisms, but cells and cell material are effective enzyme sources in the decarboxylation reaction.