Arabinoxylan gels: Impact of the feruloylation degree on their structure and properties
Arabinoxylan gels: Impact of the feruloylation degree on their structure and properties
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DOI：
10.1021/bm049629a
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发表时间：
2005-01-01
影响因子：
6.2
通讯作者：
Micard, V
中科院分区：
文献类型：
--
作者：
Carvajal-Millan, E;Landillon, V;Micard, V
从水提取的小麦阿拉伯聚糖中化学制备降低阿魏酸（FA）含量的阿拉伯木聚糖（AX）样品，而不影响其其他结构性质。凝胶从这些部分阿魏酸化的WEAX（PF-WEAX）通过FA的酶促共价交联获得，导致形成二阿魏酸（di-FA）和三阿魏酸（tri-FA）。WEAX胶凝能力被发现有关的WEAX FA含量，而凝胶的结构和性能取决于新形成的共价交联的密度。WEAX的FA含量为1.4 - 2.3 μ g/mg AX，得到的凝胶具有0.20 - 0.43 μ g/mg AX的二-FA交联含量和5 - 44 Pa的G'值。对于WEAX凝胶与初始FA含量从1.6至2.3 μ g/mg AX，平均网目尺寸范围从331至263 nm的溶胀实验计算。凝胶的交联密度，确定从溶胀实验，高于那些可以从理论上估计的二FA和三FA含量的WEAX凝胶。该结果表明，除了二FA和三FA之外，更高的阿魏酸酯交联和物理缠结将有助于最终的WEAX凝胶结构。
Arabinoxylan (AX) samples of decreasing ferulic acid (FA) contents were chemically prepared from water-extractable wheat arabinoxylans without affecting their other structural properties. Gels were obtained from these partially feruloylated WEAX (PF-WEAX) by enzymatic covalent cross-linking of FA leading to the formation of diferulic (di-FA) and tri-ferulic acid (tri-FA). WEAX gelling ability was found related to the WEAX FA content whereas the gel structure and properties depended on the density of newly formed covalent cross-links. FA content of WEAX ranging from 1.4 to 2.3 mug/mg AX gave gels with di-FA cross-links contents from 0.20 to 0.43 mug/mg AX and G' values from 5 to 44 Pa. For WEAX gels with initial FA contents from 1.6 to 2.3 mug/mg AX, average mesh size ranging from 331 to 263 nm were calculated from swelling experiments. Cross-linking densities of gels, determined from swelling experiments, were higher than those that could be theoretically estimated from the di-FA and tri-FA content of WEAX gels. This result suggests that, in addition to di-FA and tri-FA, higher ferulate cross-linking and physical entanglements would contribute to the final WEAX gel structure.