abstract |
PURPOSE:To selectively assimilate only L-aspartic acid and readily obtain D- aspartic acid, by cultivating a specific microorganism capable of assimilating only the L-aspartic acid in a culture medium containing DL-aspartic acid. CONSTITUTION:A microorganism, belonging to the genus Bacterium, Escherichia, Serratia Alcaligenes, Flavobacterium, Providencia, Pseudomonas, Debaryomyces, Hansenula, Pichia, Saccharomycopsis, Candida, Torulopsis, Cryptococcus, etc., and having selective assimilating ability to assimilate only L-aspartic acid without assimilating D-aspartic acid is cultivated in a culture medium containing DL-aspartic acid as a carbon and nitrogen sources. The resultant culture fluid is then subjected to centrifugation to remove the microbial cells therefrom and afford the aimed D-aspartic acid. |