[Effects of cultivation conditions on the optical purity of L(+)-lactic acid].
The effect of cultivation conditions on the optical purity of L(+)-lactic acid produced by Rhizopus oryzae HZS6 was investigated. The isomeric composition of lactic acid was influenced by the supplementation of L(+)-lactic acid to fermentation medium. L(+)-isomer increased with the dosage, no D(-)-lactic acid was observed when the concentration of supplemented L(+)-lactic acid in matrix was > or = 1.5 g/L. However, the L(+)-lactic acid yield, biomass and glucose conversion rate decreased with the dosage. With the same method, the supplementation of L(+)-lactic to substrate had no influence on isomeric composition of lactic acid by Lactobacillus and Escherichia coli.
Meng
Wu
W
College of Food and Bioengineering, Shandong Institute of Light Industry, Jinan 250353, China
Li
Shizhong
S
Feng
Wentao
W
Zhang
Hanxing
H
Wang
Ruiming
R
D003470:Culture Media / Q000737:chemistry; D005285:Fermentation; D019344:Lactic Acid / Q000096:biosynthesis* / Q000737:chemistry; D012233:Rhizopus / Q000254:growth & development / Q000378:metabolism*; D013237:Stereoisomerism
D003470:Culture Media; D019344:Lactic Acid