| 摘要 |
PROBLEM TO BE SOLVED: To produce D-lactic acid at a low cost. SOLUTION: A microorganism belonging to the genus Bacillus and having an ability to produce the D-lactic acid having an optical purity of >=90% from an assimilable carbon source is cultured at 31 to 45 deg.C. The culture is preferably carried out under an anaerobic condition bubbled with carbon dioxide, nitrogen, or argon at pH 4.5 to 7.0 using sodium carbonate, sodium bicarbonate, or ammonia in a culture medium containing a yeast extract in a low concentration of >=0.1% and <0.5%. The D-lactic acid having a high optical purity and a high chemical purity is collected from the culture product.
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