Open fermentative production of l-lactic acid using white rice bran by simultaneous saccharification and fermentation. (December 2015)

• Record Type: Journal Article
• Authors: Wang, Yong; Cai, Di; He, Meiling; Wang, Zheng; Qin, Peiyong; Tan, Tianwei
• Is Part Of: Bioresource technology. Volume 198(2015)
• Page Start: 664
• Page End: 672
• Publication Date: 2015-12
• Subjects: White rice bran -- l-Lactic acid -- Corn steep liquor powder -- Bacillus coagulans -- Simultaneous saccharification and fermentation; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2015.09.010
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: A two-stage strategy was efficiently used forl -lactic acid production from WRB. A stepwise controlled pH was proposed for indigenous bacteria suppression. A balanced process was obtained under an open SSF process. Abstract: To reduce raw material cost for lactic acid production, white rice bran as an important byproduct in rice milling, was used inl -lactic acid production by open simultaneous saccharification and fermentation (SSF). Although one thermotolerant strain was used at a temperature as high as 50 °C, the open fermentation was still inefficient due to the indigenous thermophilic bacteria from corn steep liquor powder. A stepwise controlled pH was proposed in open SSF process, and no complicated pretreatment or sterilization was needed before fermentation. In batch fermentation, 117 g L −1 lactic acid was obtained, and the productivity and yield reached 2.79 g L −1 h −1 and 98.75%, respectively. These results showed an efficient way to develop high value-added products from white rice bran.