Isolation and characterization of physicochemical and material properties of arabinoxylans from barley husks
Isolation and characterization of physicochemical and material properties of arabinoxylans from barley husks
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DOI：
10.1016/j.carbpol.2005.02.009
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发表时间：
2005-08-29
影响因子：
11.2
通讯作者：
Gatenholm, P
中科院分区：
文献类型：
--
作者：
Höije, A;Gröndahl, M;Gatenholm, P
比较了从大麦皮中提取阿拉伯聚糖的不同方法，研究了不同方法对大麦皮中阿拉伯聚糖的得率、组成、理化性质和物质特性的影响。分离涉及盐酸或酶预处理，浸渍或有机溶剂脱木素和碱溶液提取。得到四个分离的阿拉伯木聚糖级分。分离的级分中的阿拉伯木聚糖含量在50%和83%之间变化，在亚氯酸盐脱木质素的样品中含量最高。除糖组成外，还测定了木质素和蛋白质的量。这些样品的分子量在35，000和45，000 g/mol之间变化，通过SEC在水和DMSO中测定。通过水浇铸制备膜，并且脱木质素的样品形成透明且柔性的膜。通过拉伸试验评价了亚氯酸盐脱木素膜的力学性能。断裂应力为50 MPa，断裂应变为2.5%。在50%RH和100%RH下的平衡水分含量的测量表明，膜是高度吸湿的。(C)2005爱思唯尔有限公司保留所有权利。
Different methods of isolating arabinoxylans from barley husks were compared and the effect of isolation method on yield, composition and physicochemical as well as material properties was investigated. The isolation involved HCl or enzyme pretreatment, chlorite or organosolv delignification and an extraction with aqueous alkali. Four fractions of isolated arabinoxylan were obtained. The arabinoxylan content in the isolated fractions varied between 50 and 83%, with the highest content in the chlorite-delignified sample. In addition to the sugar composition, the amount of lignin and protein was determined. The molecular weights of these samples varied between 35,000 and 45,000 g/mol, determined by SEC in water and DMSO. Films were made by water casting, and the delignified samples formed clear and flexible films. The mechanical properties of the chlorite-delignified films were evaluated by tensile testing. The stress at break was 50 MPa and strain at break 2.5%. Measurement of the equilibrium moisture content at 50% RH and 100% RH showed that the films were highly hygroscopic. (C) 2005 Elsevier Ltd. All rights reserved.