Specific enzymatic tailoring of wheat arabinoxylan reveals the role of substitution on xylan film properties

被引：34

作者：

Heikkinen, Susanna L. ^{[1
]}

Mikkonen, Kirsi S. ^{[1
]}

Pirkkalainen, Kari ^{[2
]}

Serirnaa, Ritva ^{[2
]}

Joly, Catherine ^{[3
]}

Tenkanen, Maija ^{[1
]}

机构：

[1] Univ Helsinki, Dept Food & Environm Sci, FIN-00014 Helsinki, Finland

[2] Univ Helsinki, Dept Phys, FIN-00014 Helsinki, Finland

[3] Univ Lyon 1, IUT DGB, LRGIA EA 3733, F-01000 Bourg En Bresse, France

来源：

CARBOHYDRATE POLYMERS | 2013年 / 92卷 / 01期

基金：

芬兰科学院;

关键词：

Wheat arabinoxylan; Arabinofuranosidases; Branching; Film; Material properties; WATER-VAPOR PERMEABILITY; BETA-GLUCAN; FLOUR;

D O I：

10.1016/j.carbpol.2012.09.085

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

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.

引用

页码：733 / 740

页数：8

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