title: Structural studies of the exopolysaccharide from Lactobacillus plantarum C88 using NMR spectroscopy and the program CASPER.
abstract: 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)-α-D-Galp-(1→2)-α-D-Glcp-(1→3)-β-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)-α-D-Galp-(1→ residue. In the native EPS an O-acetyl group is present, 0.85 equiv per repeating unit, at O2 of the α-linked galactose residue; thus the repeating unit of the EPS has the following structure: →4)[β-D-Glcp-(1→3)][β-D-Galp-(1→6)]α-D-Galp2Ac-(1→2)-α-D-Glcp-(1→3)-β-D-Glcp-(1→. These structural features, and the chain length (∼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.
authors.affiliation: Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, S-106 91 Stockholm, Sweden.
authors.forename: Carolina
authors.initials: C
authors.lastname: Fontana
authors.affiliation: Institute of Agro-Food Technology, Jilin Academy of Agricultural Sciences, Changchun 130033, PR China.
authors.forename: Shengyu
authors.initials: S
authors.lastname: Li
authors.affiliation: School of Food Science, Beijing Technology and Business University, Beijing 100048, PR China.
authors.forename: Zhennai
authors.initials: Z
authors.lastname: Yang
authors.affiliation: Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, S-106 91 Stockholm, Sweden. Electronic address: gw@organ.su.se.
authors.forename: Göran
authors.initials: G
authors.lastname: Widmalm
mesh_terms: D002240:Carbohydrate Sequence; D055598:Chemical Phenomena; D048191:Lactiplantibacillus plantarum / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D008969:Molecular Sequence Data; D011135:Polysaccharides, Bacterial / Q000737:chemistry*; D013223:Statistics as Topic / Q000379:methods*
chemical_list: D011135:Polysaccharides, Bacterial
keywords: CASPER; Exopolysaccharide; Lactobacillus plantarum; NMR; O-Acetylation