Document Detail


Specific enzymatic tailoring of wheat arabinoxylan reveals the role of substitution on xylan film properties.
MedLine Citation:
PMID:  23218361     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
To increase understanding of the applicability of agro biomass by-products as biodegradable film formers, the effect of wheat arabinoxylan (WAX) fine structure on film properties was studied by applying specific enzyme modifications. WAX was selectively modified to mimic the natural variations of different arabinoxylans, particularly the degree of mono and disubstitution of α-l-arabinofuranosyl (Araf) units in β-d-xylopyranosyl (Xylp) backbone residues. The resulting modified WAX samples had similar arabinose-to-xylose (Ara/Xyl) ratios, but they differed in the number of unsubstituted Xylp units. The substitution of WAX was found to affect, in particular, tensile strength, crystallinity, and oxygen permeability properties of the films, as statistically significant decreases in tensile strength and oxygen permeability took place after WAX de-branching. An increase in the number of unsubstituted Xylp units decreased the temperature of relaxation of small-scale molecular motions of WAX (β-relaxation) and increased the degree of crystallinity of the films.
Authors:
Susanna L Heikkinen; Kirsi S Mikkonen; Kari Pirkkalainen; Ritva Serimaa; Catherine Joly; Maija Tenkanen
Publication Detail:
Type:  Journal Article     Date:  2012-10-08
Journal Detail:
Title:  Carbohydrate polymers     Volume:  92     ISSN:  1879-1344     ISO Abbreviation:  Carbohydr Polym     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2012-12-10     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8307156     Medline TA:  Carbohydr Polym     Country:  England    
Other Details:
Languages:  eng     Pagination:  733-40     Citation Subset:  IM    
Copyright Information:
Copyright © 2012 Elsevier Ltd. All rights reserved.
Affiliation:
Department of Food and Environmental Sciences, P.O. Box 27, FIN-00014, University of Helsinki, Finland. Electronic address: susanna.l.heikkinen@helsinki.fi.
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