Yield-determining factors in high-solids enzymatic hydrolysis of lignocellulose

纤维素酶 纤维二糖 化学 纤维素 水解 酶水解 产量(工程) 吸附 基质(水族馆) 木质素 产物抑制 木质纤维素生物量 发酵 半纤维素 生物量(生态学) 总溶解固体 挥发性悬浮物 化学工程 悬浮物 食品科学 材料科学 有机化学 废水 废物管理 农学 环境工程 非竞争性抑制 生物 海洋学 工程类 冶金 地质学
作者
Jan B. L. Kristensen,Claus Felby,Henning Jørgensen
出处
期刊:Biotechnology for Biofuels [Springer Science+Business Media]
卷期号:2 (1) 被引量:603
标识
DOI:10.1186/1754-6834-2-11
摘要

Working at high solids (substrate) concentrations is advantageous in enzymatic conversion of lignocellulosic biomass as it increases product concentrations and plant productivity while lowering energy and water input. However, for a number of lignocellulosic substrates it has been shown that at increasing substrate concentration, the corresponding yield decreases in a fashion which can not be explained by current models and knowledge of enzyme-substrate interactions. This decrease in yield is undesirable as it offsets the advantages of working at high solids levels. The cause of the 'solids effect' has so far remained unknown.The decreasing conversion at increasing solids concentrations was found to be a generic or intrinsic effect, describing a linear correlation from 5 to 30% initial total solids content (w/w). Insufficient mixing has previously been shown not to be involved in the effect. Hydrolysis experiments with filter paper showed that neither lignin content nor hemicellulose-derived inhibitors appear to be responsible for the decrease in yields. Product inhibition by glucose and in particular cellobiose (and ethanol in simultaneous saccharification and fermentation) at the increased concentrations at high solids loading plays a role but could not completely account for the decreasing conversion. Adsorption of cellulases was found to decrease at increasing solids concentrations. There was a strong correlation between the decreasing adsorption and conversion, indicating that the inhibition of cellulase adsorption to cellulose is causing the decrease in yield.Inhibition of enzyme adsorption by hydrolysis products appear to be the main cause of the decreasing yields at increasing substrate concentrations in the enzymatic decomposition of cellulosic biomass. In order to facilitate high conversions at high solids concentrations, understanding of the mechanisms involved in high-solids product inhibition and adsorption inhibition must be improved.
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