원문정보
초록
영어
Lactic acid is a chemical compound that widely used in many industries as a food additive, a solvent, and a precursor for biodegradable plastic. This useful compound is produced by either chemical synthesis or microbial fermentation, but only biosynthesized one has high optical purity. Biomass such as corn, wheat, and tapioca are commonly used, but these materials should be imported. For this reason, we choose rice bran and broken rice which are most abandoned biomass as byproducts of a rice-polishing mill in South Korea for this study. Fermentation was performed at 37 °C, pH 6.5 with Ammonia water, with of 250 rpm in Fed-batch. The third forth of the fermentation broth was replaced with broken rice hydrolyzate. This process was repeated twice. The obtained lactic acid, yield, and productivity were 347.8g/L, 96.58%, and 0.71 g/L·hr, respectively.