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Effects of sugar inhibition on cellulases and β-glucosidase during enzymatic hydrolysis of softwood substrates

  • Session 6A Biomass Pretreatment and Hydrolysis
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Abstract

A quantitative approach was taken to determine the inhibition effects of glucose and other sugar monomers during cellulase and β-Glucosidase hydrolysis of two types of cellulosic material: Avicel and acetic acid-pretreated softwood. The increased glucose content in the hydrolysate resulted in a dramatic increase in the degrees of inhibition on both β-Glucosidase and cellulase activities. Supplementation of mannose, xylose, and galactose during cellobiose hydrolysis did not show any inhibitory effects on β-Glucosidase activity. However, these sugars were shown to have significant inhibitory effects on cellulase activity during cellulose hydrolysis. Our study suggests that high-substrate consistency hydrolysis with supplementation of hemicellulose is likely to be a practical solution to minimizing end-product inhibition effects while producing hydrolysate with high glucose concentration.

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Correspondence to John N. Saddler.

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Xiao, Z., Zhang, X., Gregg, D.J. et al. Effects of sugar inhibition on cellulases and β-glucosidase during enzymatic hydrolysis of softwood substrates. Appl Biochem Biotechnol 115, 1115–1126 (2004). https://doi.org/10.1385/ABAB:115:1-3:1115

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  • DOI: https://doi.org/10.1385/ABAB:115:1-3:1115

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