title: Sweet sorghum bagasse and corn stover serving as substrates for producing sophorolipids.
abstract: To make the process of producing sophorolipids by Candida bombicola truly sustainable, we investigated production of these biosurfactants on biomass hydrolysates. This study revealed: (1) yield of sophorolipds on bagasse hydrolysate decreased from 0.56 to 0.54 and to 0.37 g/g carbon source when yellow grease was dosed at 10, 40 and 60 g/L, respectively. In the same order, concentration of sophorolipids was 35.9, 41.9, and 39.3 g/L; (2) under similar conditions, sophorolipid yield was 0.12, 0.05 and 0.04 g/g carbon source when corn stover hydrolysate was mixed with soybean oil at 10, 20 and 40 g/L. Sophorolipid concentration was 11.6, 4.9, and 3.9 g/L for the three oil doses from low to high; and (3) when corn stover hydrolysate and yellow grease served as the substrates for cultivating the yeast in a fermentor, sophorolipid concentration reached 52.1 g/L. Upon further optimization, sophorolipids production from ligocellulose will be indeed sustainable.
authors.affiliation: Department of Civil and Environmental Engineering, Southern Illinois University Carbondale, 1230 Lincoln Dr., Carbondale, IL, 62901, USA.
authors.forename: Abdul
authors.initials: A
authors.lastname: Samad
authors.affiliation: Department of Civil and Environmental Engineering, Southern Illinois University Carbondale, 1230 Lincoln Dr., Carbondale, IL, 62901, USA.
authors.forename: Ji
authors.initials: J
authors.lastname: Zhang
authors.affiliation: Cooperative Wildlife Research Laboratory and Department of Zoology, Life Science II, Carbondale, IL, 62901, USA.
authors.forename: Da
authors.initials: D
authors.lastname: Chen
authors.affiliation: National Bioenergy Center, National Renewable Energy Lab, 1617 Cole Blvd, Golden, CO, 80127, USA.
authors.forename: Xiaowen
authors.initials: X
authors.lastname: Chen
authors.affiliation: National Bioenergy Center, National Renewable Energy Lab, 1617 Cole Blvd, Golden, CO, 80127, USA.
authors.forename: Melvin
authors.initials: M
authors.lastname: Tucker
authors.affiliation: Department of Civil and Environmental Engineering, Southern Illinois University Carbondale, 1230 Lincoln Dr., Carbondale, IL, 62901, USA. liangy@siu.edu.|Material Technology Center, Southern Illinois University Carbondale, 1230 Lincoln Dr., Carbondale, IL, 62901, USA. liangy@siu.edu.
authors.forename: Yanna
authors.identifier: 0000-0003-4858-6330
authors.initials: Y
authors.lastname: Liang
mesh_terms: D018533:Biomass; D019149:Bioreactors; D002175:Candida / Q000378:metabolism*; D002482:Cellulose / Q000737:chemistry*; D003470:Culture Media / Q000737:chemistry; D006017:Glycolipids / Q000378:metabolism*; D007218:Industrial Microbiology; D045868:Sorghum / Q000737:chemistry*; D013024:Soybean Oil / Q000737:chemistry; D003313:Zea mays / Q000737:chemistry*
chemical_list: D003470:Culture Media; D006017:Glycolipids; D013024:Soybean Oil; D002482:Cellulose; C027433:bagasse
keywords: Candida (Starmerella) bombicola; Corn stover; Deacetylated and disc refined (DDR); Sophorolipids; Sweet sorghum bagasse