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半纤维素

半纤维素的最常见的分子模体

半纤维素(英語:Hemicellulose)是与纤维素共同存在于大多数植物细胞壁的一类杂聚多糖(矩阵型多糖,如阿糖基木聚糖[1]。纤维素是结晶的、强壮的、抗水解,聚合度为7000-15000。半纤维素是随机的、非结晶结构;强度低;在稀条件下或多种半纤维素酶作用下易于水解,聚合度为500-3000。

组成

半纤维素包括木聚醣、聚半乳糖葡萄糖甘露糖、聚阿拉伯糖半乳糖、葡甘露聚醣,和聚葡萄糖甘露糖等。

粗制的半纤维素可将其分为一个中性组分(半纤维素A)和一个酸性组分(半纤维素B)。 半纤维素是由几种不同类型的单糖构成的异质多聚体,这些糖是五碳糖六碳糖,包括木糖阿拉伯糖甘露糖半乳糖鼠李糖等。木聚糖在木质组织中占总量的50%。

参阅

  1. ^ Scheller, Henrik Vibe; Ulvskov, Peter. Hemicelluloses. Annual Review of Plant Biology. 2010, 61: 263–289 [2021-11-10]. ISSN 1545-2123. PMID 20192742. doi:10.1146/annurev-arplant-042809-112315. (原始内容存档于2022-05-11). 
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半纤维素
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