期刊
CARBOHYDRATE POLYMERS
卷 92, 期 1, 页码 733-740出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2012.09.085
关键词
Wheat arabinoxylan; Arabinofuranosidases; Branching; Film; Material properties
资金
- University of Helsinki
- Academy of Finland [132150]
- Academy of Finland (AKA) [132150, 132150] Funding Source: Academy of Finland (AKA)
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 alpha-L-arabinofuranosyl (Araf) units in beta-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 (beta-relaxation) and increased the degree of crystallinity of the films. (C) 2012 Elsevier Ltd. All rights reserved.
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