Advances of direct lactic acid fermentation

The present situation of research on direct fermentation of starch bearing materials to lactic acid was summarized. The direct lactic acid fermentation progress could be mainly classified into three types,including direct lactic acid fermentation with Rhizopus oryzae and amylolytic lactic acid bacteria,and simultaneous saccharification and ferment starchy biomass to lactic acid by simultaneously adding of degrading enzymes and lactic acid producing bacteria. It was pointed out that the efficiency of lactic acid fermentation could be increased by screening and constructing of potent amylolytic lactic acid bacteria or lactic acid-producing fungal. Meanwhile,the fermentation efficiency could be improved by obtaining the thermophilic microorganisms to raise the temperature of simultaneous saccharification and fermentation.