title: Improving rheology and enzymatic hydrolysis of high-solid corncob slurries by adding lignosulfonate and long-chain fatty alcohols.
abstract: The effects of lignosulfonate (SXSL) and long-chain fatty alcohols (LFAs) on the rheology and enzymatic hydrolysis of high-solid corncob slurries were investigated. The application of 2.5% (w/w) SXSL increased the substrate enzymatic digestibility (SED) of high-solid corncob slurries at 72 h from 31.7 to 54.0%, but meanwhile it increased the slurry's yield stress and complex viscosity to make the slurry difficult to stir and pump. The smallest molecular weight (MW) SXSL fraction had the strongest enhancement on SED. The SXSL fraction with large MW had a negative effect on rheology. n-Octanol (C8) and n-decanol (C10) improved the rheological properties of high-solid slurry and are strong enough to counteract the negative effect of SXSL. Furthermore, C8 and C10 clearly enhanced the enzymatic hydrolysis of high-solid corncob slurries with and without SXSL. A mechanism was proposed to explain the observed negative effect of SXSL and the positive effect of LFAs on the rheological properties.
authors.affiliation: School of Chemistry and Chemical Engineering and ‡State Key Laboratory of Pulp and Paper Engineering, South China University of Technology , Guangzhou, China.
authors.forename: Hongming
authors.initials: H
authors.lastname: Lou
authors.forename: Shun
authors.initials: S
authors.lastname: Wu
authors.forename: Xiuli
authors.initials: X
authors.lastname: Li
authors.forename: Tianqing
authors.initials: T
authors.lastname: Lan
authors.forename: Dongjie
authors.initials: D
authors.lastname: Yang
authors.forename: Yuxia
authors.initials: Y
authors.lastname: Pang
authors.forename: Xueqing
authors.initials: X
authors.lastname: Qiu
authors.forename: Xuehui
authors.initials: X
authors.lastname: Li
authors.forename: Jinhao
authors.initials: J
authors.lastname: Huang
mesh_terms: D055162:Biocatalysis; D001709:Biotechnology / Q000295:instrumentation / Q000379:methods*; D002480:Cellulase / Q000737:chemistry*; D005233:Fatty Alcohols / Q000737:chemistry; D005656:Fungal Proteins / Q000737:chemistry*; D008031:Lignin / Q000031:analogs & derivatives / Q000737:chemistry; D012212:Rheology; D014242:Trichoderma / Q000201:enzymology; D014783:Viscosity; D003313:Zea mays / Q000737:chemistry*
chemical_list: D005233:Fatty Alcohols; D005656:Fungal Proteins; C001545:lignosulfuric acid; D008031:Lignin; D002480:Cellulase
keywords: corncob slurry; high-solid enzymatic hydrolysis; lignosulfonate; long-chain fatty alcohols; rheology