Document Detail

Kinetic modeling analysis of maleic acid-catalyzed hemicellulose hydrolysis in corn stover.
MedLine Citation:
PMID:  18781694     Owner:  NLM     Status:  MEDLINE    
Maleic acid-catalyzed hemicellulose hydrolysis reaction in corn stover was analyzed by kinetic modeling. Kinetic constants for Saeman and biphasic hydrolysis models were analyzed by an Arrhenius-type expansion which include activation energy and catalyst concentration factors. The activation energy for hemicellulose hydrolysis by maleic acid was determined to be 83.3 +/- 10.3 kJ/mol, which is significantly lower than the reported E(a) values for sulfuric acid catalyzed hemicellulose hydrolysis reaction. Model analysis suggest that increasing maleic acid concentrations from 0.05 to 0.2 M facilitate improvement in xylose yields from 40% to 85%, while the extent of improvement flattens to near-quantitative by increasing catalyst loading from 0.2 to 1 M. The model was confirmed for the hydrolysis of corn stover at 1 M maleic acid concentrations at 150 degrees C, resulting in a xylose yield of 96% of theoretical. The refined Saeman model was used to evaluate the optimal condition for monomeric xylose yield in the maleic acid-catalyzed reaction: low temperature reaction conditions were suggested, however, experimental results indicated that bi-phasic behavior dominated at low temperatures, which may be due to the insufficient removal of acetyl groups. A combination of experimental data and model analysis suggests that around 80-90% xylose yields can be achieved at reaction temperatures between 100 and 150 degrees C with 0.2 M maleic acid.
Yulin Lu; Nathan S Mosier
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Biotechnology and bioengineering     Volume:  101     ISSN:  1097-0290     ISO Abbreviation:  Biotechnol. Bioeng.     Publication Date:  2008 Dec 
Date Detail:
Created Date:  2008-11-10     Completed Date:  2008-12-17     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7502021     Medline TA:  Biotechnol Bioeng     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1170-81     Citation Subset:  IM    
Agricultural and Biological Engineering, Laboratory of Renewable Resources Engineering, Purdue University, West Lafayette, Indiana 47907, USA.
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MeSH Terms
Maleates / metabolism*
Models, Theoretical
Polysaccharides / metabolism*
Xylose / metabolism
Zea mays / metabolism*
Reg. No./Substance:
0/Maleates; 0/Polysaccharides; 0/Xylose; 110-16-7/maleic acid; 8024-50-8/hemicellulose

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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