阿拉伯木聚糖
蜡
极限抗拉强度
结晶度
化学
木糖
透氧性
阿拉伯糖
木聚糖
支化(高分子化学)
化学工程
多糖
材料科学
高分子化学
有机化学
复合材料
氧气
发酵
结晶学
工程类
作者
Susanna Heikkinen,Kirsi S. Mikkonen,Kari Pirkkalainen,Ritva Serimaa,Catherine Joly,Maija Tenkanen
标识
DOI:10.1016/j.carbpol.2012.09.085
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 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.
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