Submerged fermentation technology for the production of high optical purity L-lactic acid by Rhizopus oryzae was studied in this paper. The results were as follows:
A mutagenized strain Rhizopus oryzae ASS.819 was used to produce L-lactic acid from sweet potato starch, and the fermentation technology in shake flask was investigated at first. The results showed that the optimal compositions of medium(%) were 15 sweet potato starch hydrolyte, 0.40 (NH4)2SO4, 0.03 KH2PO4, 0.044 ZnS...