Document Detail

Effect of ionic liquid pretreatment on the structure of hemicelluloses from corncob.
MedLine Citation:
PMID:  23057617     Owner:  NLM     Status:  Publisher    
Pretreatment is the key to unlock the recalcitrance of lignocellulosic biomass for the productions of biofuels. Ionic liquids pretreatment has drawn increased attention due to its numerous advantages over conventional methods. In this study, corncob was submitted to pretreatments with 1-ethyl-3-methylimadazolium acetate (EMIMAc) or/and H(2)O/DMSO followed by alkaline extraction to isolate hemicelluloses. The hemicellulosic fractions obtained were comprehensively characterized with a series of chemical and spectroscopic technologies including GPC, TGA, HPAEC, FT-IR, and 1 and 2 dimensional NMR. The results showed that the fractions prepared with ionic liquid pretreatments exhibited relatively higher average molecular weights (196230-349480 g/mol) than the fraction prepared without pretreatment (M(w), 96260 g/mol). Furthermore the pretreated fractions demonstrated higher thermal stability as compared to the fractions without pretreatment. Structural characterization indicated that all the fractions were similar, which are composed of (1→4)-linked β-D-xylopyranosyl backbone substituted with arabinofuranosyls attached to O-2 and O-3 and with 4-O-methyl-α-D-glucuronic acid also linked to O-2.
Shao-Ni Sun; Ming-Fei Li; Tong-Qi Yuan; Feng Xu; Run-Cang Sun
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-10-12
Journal Detail:
Title:  Journal of agricultural and food chemistry     Volume:  -     ISSN:  1520-5118     ISO Abbreviation:  J. Agric. Food Chem.     Publication Date:  2012 Oct 
Date Detail:
Created Date:  2012-10-12     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0374755     Medline TA:  J Agric Food Chem     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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