Effects of cultivation conditions on the optical purity of L(+)-lactic acid.
- Author:
Wu MENG
1
;
Shizhong LI
;
Wentao FENG
;
Hanxing ZHANG
;
Ruiming WANG
Author Information
1. College of Food and Bioengineering, Shandong Institute of Light Industry, Jinan 250353, China
- Publication Type:Journal Article
- MeSH:
Culture Media;
chemistry;
Fermentation;
Lactic Acid;
biosynthesis;
chemistry;
Rhizopus;
growth & development;
metabolism;
Stereoisomerism
- From:
Chinese Journal of Biotechnology
2009;25(11):1679-1683
- CountryChina
- Language:Chinese
-
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.
