文献类型： 外文期刊

第一作者： Sun Yuan-Lin

作者： Sun Yuan-Lin;Zhang Jun-Ming;Gu Xiao-Hong;Shan Fang;Cui Wu-Wei

作者机构：

关键词： Black-grained wheat;Pentosan;Partial acid hydrolysis;Methylation analysis

期刊名称：CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE （ 影响因子：0.65； 五年影响因子：0.481 ）

ISSN： 0251-0790

年卷期： 2012 年 33 卷 5 期

页码：

收录情况： SCI

摘要： The hydrolytic characteristics and the structural features of substitute degree as well as substitute patterns of pentosans (AEPH) from black-grained wheat bran were analyzed. AEPH was hydrolyzed with 0.02, 0.1, and 0.2 mol/L trifluoroacetic acid(TFA), respectively. The structural features and M-w of AEPH were studied with methylation methods, combined with GC-MS and HPLC instruments. The results indicated that the residues of sugar constituents were mainly Araf and Xylp, with an Ara/Xyl(A/X) ratio of 0.60 and a high average molecular weight (M-w) of 3.81 x 10(5). AEPH contained a xylan backbone of 1 -> 4 linked Xylp residues which was mono- or disubstituted with Araf groups at position O3, O2 or at both O2 and O3 positions. The relative composition ratio of un-, mono-, and di-substituted Xylp in the arabinoxylan fraction was 57.7 22.0:6.2, with a high proportion of unsubstituted to substituted Xylp (2. 1), and a very low proportion of di-to monosubstituted Xylp residues(d/m, 0.3). Araf side groups were linked to Xylp residues of the backbone as terminal Araf single units. Moreover, small quantities of 1 -> 2, and 1 -> 5 linked Araf indicated the presence of short arabinan side chains terminated with T-Xylp residues.

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