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Title: Effects of Lignin-Metal Complexation on Enzymatic Hydrolysis of Cellulose

Source: J. Agric. Food Chem. 2010, 58, 7233-7238; 2010

Author(s)Liu, H.; Zhu, J.Y.; Fu, S.Y.

Publication Year: 2010  View PDF »

Category: Journal Articles
Associated Research Project(s):   FPL-4709-1A

Abstract: This study investigated the inhibition of enzymatic hydrolysis by unbound lignin (soluble and insoluble) with or without the addition of metal compounds. Sulfonated, Organosolv, and Kraft lignin were added in aqueous enzyme-cellulose systems at different concentrations before hydrolysis. The measured substrate enzymatic digestibility (SED) of cellulose was decreased by 15% when SL was added to a concentration of 0.1 g/L due to nonproductive adsorption of enzymes onto lignin. Cu(II) and Fe(III) were found to inhibit enzymatic cellulose hydrolysis in the presence of lignin. Ca(II) and Mg(II) were found to reduce or eliminate nonproductive enzyme adsorption by the formation of lignin-metal complex. The addition of Ca(II) or Mg(II) to a concentration of 10 mM can almost completely eliminate the reduction in SED caused by the nonproductive enzyme adsorption onto the lignins studied (SL, OL, or KL at concentration of 0.1 g/L). Ca(II) was also found to reduce the inhibitive effect of bound lignin in pretreated wood substrate, suggesting that Ca(II) can also form complex with bound lignin on pretreated solid lignocelluloses. Significant improvement in SED of about over 27% of a eucalyptus substrate produced by sulfite pretreatment to overcome recalcitrance of lignocellulose (SPORL) was achieved with the application of Ca(II).

Keywords: Biomass, utilization, biotechnology, pretreatment, lignocellulose, biodegradation, cellulose, hydrolysis, enzymes, industrial applications, lignin, calcium, magnesium, adsorption, absorption, Eucalyptus, iron, fermentation, sugars, hemicellulose, SPORL, bioconversion, biorefining, wood extractives, chemical utilization, saccharification

Publication Review Process: Informally Refereed (Peer-Reviewed)

File size: 828 kb(s)

Date posted: 07/15/2010

This publication is also viewable on Treesearch:  view
RITS Product ID: 35737
Current FPL Scientist associated with this product
Zhu, JunYong
Research General Engineer
  

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