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Structural studies of the exopolysaccharide from Lactobacillus plantarum C88 using NMR spectroscopy and the program CASPER

文献类型： 外文期刊

作者： Fontana, Carolina 1 ; Li, Shengyu 2 ; Yang, Zhennai 3 ; Widmalm, Goran 1 ;

作者机构： 1.Stockholm Univ, Arrhenius Lab, Dept Organ Chem, S-10691 Stockholm, Sweden

2.Jilin Acad Agr Sci, Inst Agrofood Technol, Changchun 130033, Peoples R China

3.Beijing Technol & Business Univ, Sch Food Sci, Beijing 100048, Peoples R China

关键词： CASPER;Exopolysaccharide;Lactobacillus plantarum;NMR;O-Acetylation

期刊名称：CARBOHYDRATE RESEARCH （ 影响因子：2.104； 五年影响因子：2.192 ）

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收录情况： SCI

摘要： Some lactic acid bacteria, such as those of the Lactobacillus genus, have the ability to produce exopolysaccharides (EPSs) that confer favorable physicochemical properties to food and/or beneficial physiological effects on human health. In particular, the EPS of Lactobacillus plantarum C88 has recently demonstrated in vitro antioxidant activity and, herein, its structure has been investigated using NMR spectroscopy and the computer program CASPER (Computer Assisted Spectrum Evaluation of Regular polysaccharides). The pentasaccharide repeating unit of the O-deacetylated EPS consists of a trisaccharide backbone, -> 4)-alpha-DGalp-(1 -> 2)-alpha-D-Glcp-(1 -> 3)-beta-D-Glcp-(1 ->, with terminal D-Glc and D-Gal residues (1.0 and 0.8 equiv per repeating unit, respectively) extending from O3 and O6, respectively, of the -> 4)-alpha-D-Galp-(1 -> residue. In the native EPS an O-acetyl group is present, 0.85 equiv per repeating unit, at O2 of the alpha-linked galactose residue; thus the repeating unit of the EPS has the following structure: -> 4)[beta-D-Glcp-(1 -> 3)][beta-D-Galp-(1 -> 6)]alpha-D-Galp2Ac-(1 -> 2)-alpha-D-Glcp-(1 -> 3)-beta-D-Glcp-(1 ->. These structural features, and the chain length (similar to 10(3) repeating units on average, determined in a previous study), are expected to play an important role in defining the physicochemical properties of the polymer. (C) 2014 Elsevier Ltd. All rights reserved.

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