Conversion of Agricultural Wastes to Lactic Acid by a Combination of Pentose-fermentative Lactic Acid Bacteria and Reversibly Soluble-insoluble Enzymes

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1) Glucose and xylose were mainly obtained from delignified rice straw by hydrolysis using cellulase preparation. Glucose and arabinose were mainly obtained from defatted rice bran by hydrolysis using amylase and cellulase preparations.2) Lactobacillus vaccinostericus, Lactobacillus pentosus, Pediococcus pentosaceus, and Enterococcus casseliflavus were selected as a xylose-fermented lactic acid bacterium. More lactic acid was produced from MRS medium containing xylose by E. casseliflavus as compared with other lactic acid bacteria.3) The amount of lactic acid produced did not increase in a fermentation using MRS medium containing xylose and glucose as a carbon source and E. casseliflavus.4) The maintenance of pH at a low value in a simultaneous saccharification and fermentation of non-sterilized rice bran allowed the selective growth of Lactobacillus rhamnosus, a lactic acid bacterium added. About 30 g/L of L-lactic acid was produced from defatted rice bran in a simultaneous saccharification and fermentation in which the pH was kept at 4.5.