title: Efficient production of lactic acid from sucrose and corncob hydrolysate by a newly isolated Rhizopus oryzae GY18.
abstract: The aim of this study is to investigate production of L-lactic acid from sucrose and corncob hydrolysate by the newly isolated R. oryzae GY18. R. oryzae GY18 was capable of utilizing sucrose as a sole source, producing 97.5 g l(-1) L-lactic acid from 120 g l(-1) sucrose. In addition, the strain was also efficiently able to utilize glucose and/or xylose to produce high yields of L-lactic acid. It was capable of producing up to 115 and 54.2 g l(-1) lactic acid with yields of up to 0.81 g g(-1) glucose and 0.90 g g(-1) xylose, respectively. Corncob hydrolysates obtained by dilute acid hydrolysis and enzymatic hydrolysis of the cellulose-enriched residue were used for lactic acid production by R. oryzae GY18. A yield of 355 g lactic acid per kg corncobs was obtained after 72 h incubation. Therefore, sucrose and corncobs could serve as potential sources of raw materials for efficient production of lactic acid by R. oryzae GY18.
authors.affiliation: Department of Biotechnology, College of Food Science and Nutritional Engineering, China Agricultural University, No. 17 Qinghua Donglu, Haidian District, PO Box 294, Beijing, 100083, China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Guo
authors.forename: Qiaojuan
authors.initials: Q
authors.lastname: Yan
authors.forename: Zhengqiang
authors.initials: Z
authors.lastname: Jiang
authors.forename: Chao
authors.initials: C
authors.lastname: Teng
authors.forename: Xinlei
authors.initials: X
authors.lastname: Wang
mesh_terms: D002482:Cellulose / Q000378:metabolism; D005285:Fermentation; D005947:Glucose / Q000378:metabolism; D006868:Hydrolysis; D019344:Lactic Acid / Q000096:biosynthesis*; D012233:Rhizopus / Q000145:classification* / Q000378:metabolism*; D013395:Sucrose / Q000378:metabolism*; D014994:Xylose / Q000378:metabolism; D003313:Zea mays / Q000737:chemistry*
chemical_list: D019344:Lactic Acid; D013395:Sucrose; D002482:Cellulose; D014994:Xylose; D005947:Glucose