As a natural organic acid, lactic acid has versatile applications in food, pharmaceutical, textile, leather and chemical industries
(Gao et al., 2011; Yun et al., 2003). The high raw material cost in the production of optically pure lactic acid has limited the applications of lactic acid in more fields, especially in polylactic acid (PLA). Recently, great attention has been paid to agro-industrial wastes which can replace the refined and costly raw materials Rice bran (RB) could be classified as yellow rice bran and white rice bran according to the rice milling process.