title: Enhancement of l-lactic acid production via synergism in open co-fermentation of Sophora flavescens residues and food waste.
abstract: In this study, Sophora flavescens residues (SFR) were used for l-lactic acid production and were mixed with food waste (FW) to assess the effects of different compositions of SFR and FW. Positive synergistic effects of mixed substrates were achieved with co-fermentation. Co-fermentation increased the proportion of l-lactic acid by decreasing the co-products of ethanol and other organic acids. A maximum l-lactic acid concentration of 48.4g/L and l-lactic acid conversion rate of 0.904g/g total sugar were obtained through co-fermentation of SFR and FW at the optimal ratio of 1:1.5. These results were approximately 6-fold those obtained during mono-fermentation of SFR. Co-fermentation of SFR and FW provides a suitable C/N ratio and pH for effective open fermentative production of l-lactic acid.
authors.affiliation: Department of Environmental Engineering, School of Civil and Environmental Engineering, University of Science and Technology Beijing, 30 Xueyuan Road, Haidian District, Beijing 10083, China; Beijing Key Laboratory on Resource-Oriented Treatment of Industrial Pollutants, University of Science and Technology Beijing, 30 Xueyuan Road, Haidian District, Beijing 10083, China. Electronic address: zhengjin2810@163.com.
authors.forename: Jin
authors.initials: J
authors.lastname: Zheng
authors.affiliation: Department of Environmental Engineering, School of Civil and Environmental Engineering, University of Science and Technology Beijing, 30 Xueyuan Road, Haidian District, Beijing 10083, China; Beijing Key Laboratory on Resource-Oriented Treatment of Industrial Pollutants, University of Science and Technology Beijing, 30 Xueyuan Road, Haidian District, Beijing 10083, China. Electronic address: gaoming402@163.com.
authors.forename: Ming
authors.initials: M
authors.lastname: Gao
authors.affiliation: Department of Environmental Engineering, School of Civil and Environmental Engineering, University of Science and Technology Beijing, 30 Xueyuan Road, Haidian District, Beijing 10083, China; Beijing Key Laboratory on Resource-Oriented Treatment of Industrial Pollutants, University of Science and Technology Beijing, 30 Xueyuan Road, Haidian District, Beijing 10083, China. Electronic address: wangqh59@163.com.
authors.forename: Qunhui
authors.initials: Q
authors.lastname: Wang
authors.affiliation: Department of Environmental Engineering, School of Civil and Environmental Engineering, University of Science and Technology Beijing, 30 Xueyuan Road, Haidian District, Beijing 10083, China. Electronic address: 17701343909@163.com.
authors.forename: Juan
authors.initials: J
authors.lastname: Wang
authors.affiliation: Beijing Academy of Agricultural and Forestry Sciences, No. 11 Shuguang Garden Road, Haidian District, Beijing 100097, China. Electronic address: sunxiaohong19675@aliyun.com.
authors.forename: Xiaohong
authors.initials: X
authors.lastname: Sun
authors.affiliation: Department of Environmental Engineering, School of Civil and Environmental Engineering, University of Science and Technology Beijing, 30 Xueyuan Road, Haidian District, Beijing 10083, China. Electronic address: 1060719203@qq.com.
authors.forename: Qiang
authors.initials: Q
authors.lastname: Chang
authors.affiliation: Laboratory of Microbial Environmental Protection, Tropical Microbiology Unit, Center for International Education and Research of Agriculture, Faculty of Agriculture, Kyushu University, 6-10-1 Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan; Laboratory of Functional Food Design, Department of Functional Metabolic Design, Bio-Architecture Center, Kyushu University, 6-10-1 Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan. Electronic address: tashiro@agr.kyushu-u.ac.jp.
authors.forename: Yukihiro
authors.initials: Y
authors.lastname: Tashiro
mesh_terms: D019149:Bioreactors / Q000382:microbiology*; D005285:Fermentation; D005502:Food; D019344:Lactic Acid / Q000032:analysis / Q000096:biosynthesis / Q000378:metabolism; D062611:Solid Waste; D029909:Sophora / Q000378:metabolism*
chemical_list: D062611:Solid Waste; D019344:Lactic Acid
keywords: Co-fermentation; Food waste; Sophora flavescens residue; Synergism; l-Lactic acid production