Cellulase Inhibition by High Concentrations of Monosaccharides

Chia-Wen Hsieh, David Cannella, Henning Jørgensen, Claus Felby, Lisbeth Garbrecht Thygesen

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Biological degradation of biomass on an industrial scale culminates in high concentrations of end products. It is known that the accumulation of glucose and cellobiose, end products of hydrolysis, inhibit cellulases and decrease glucose yields. Aside from these end products, however, other monosaccharides such as mannose and galactose (stereoisomers of glucose) decrease glucose yields as well. NMR relaxometry measurements showed direct correlations between the initial T 2 of the liquid phase in which hydrolysis takes place and the total glucose production during cellulose hydrolysis, indicating that low free water availability contributes to cellulase inhibition. Of the hydrolytic enzymes involved, those acting on the cellulose substrate, that is, exo- and endoglucanases, were the most inhibited. The β -glucosidases were shown to be less sensitive to high monosaccharide concentrations except glucose. Protein adsorption studies showed that this inhibition e ff ect was most likely due to catalytic, and not binding, inhibition of the cellulases.
Original languageEnglish
JournalJournal of Agricultural and Food Chemistry
Volume62
Pages (from-to)3800-3805
ISSN0021-8561
DOIs
Publication statusPublished - 2014

Keywords

  • Water availability
  • Enzymatic hydrolysis
  • T 2 relaxation
  • Cellulase adsorption
  • Cellulase inhibition

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