期刊
CARBOHYDRATE POLYMERS
卷 132, 期 -, 页码 59-66出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2015.06.023
关键词
Amylopectin; Glucoamylase; Gluco-oligosaccharide; Maltodextrins
In the conversion of starch to fermentable glucose for bioethanol production, hydrolysis of amylopectin by alpha-amylases and glucoamylases is the slowest step. In this process, alpha-1,6-branched gluco-oligosaccharides accumulate and are slowly degraded. Glucoamylases that are able to degrade such branched oligosaccharides faster are economically beneficial. This research aimed at the isolation and characterisation of branched gluco-oligosaccharides produced from amylopectin digestion by a-amylase, to be used as substrates for comparing their degradation by glucoamylases. Branched gluco-oligosaccharides with a DP between five and twelve were purified using size exclusion chromatography. These structures were characterised after labelling with 2-aminobenzamide using UHPLC-MSn analysis. Further, the purified oligosaccharides were used to evaluate the mode-of-action of a glucoamylase from Hypocrea jecorina. The enzyme cleaves the alpha-1,4-linkage adjacent to the alpha-1,6-linkage at a lower rate than that of alpha-1,4-linkages in linear oligosaccharides. Hence, the branched gluco-oligosaccharides are a suitable substrate to evaluate glucoamylase activity on branched structures. (C) 2015 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据