title: [Effects of cultivation conditions on the optical purity of L(+)-lactic acid].
abstract: 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.
authors.affiliation: College of Food and Bioengineering, Shandong Institute of Light Industry, Jinan 250353, China
authors.forename: Wu
authors.initials: W
authors.lastname: Meng
authors.forename: Shizhong
authors.initials: S
authors.lastname: Li
authors.forename: Wentao
authors.initials: W
authors.lastname: Feng
authors.forename: Hanxing
authors.initials: H
authors.lastname: Zhang
authors.forename: Ruiming
authors.initials: R
authors.lastname: Wang
mesh_terms: D003470:Culture Media / Q000737:chemistry; D005285:Fermentation; D019344:Lactic Acid / Q000096:biosynthesis* / Q000737:chemistry; D012233:Rhizopus / Q000254:growth & development / Q000378:metabolism*; D013237:Stereoisomerism
chemical_list: D003470:Culture Media; D019344:Lactic Acid