D-Amino acid production from racemic amino acids by a microbial asymmetric degradation

To obtain D-amino acid from a mixture of racemic amino acids, Proteus vulgaris, having the ability of selective degradation of L-isomer in various DL-amino acids mixtures, was used as a biocatalyst. D-Isomer crystals of valine, leucine, isoleucine, histidine and ornithine were isolated at a good yield (25 similar to 41%) from the reaction mixture after 24 similar to 72 hours.