Molecular characteristics of an exopolysaccharide from Lactobacillus rhamnosus KF5 in solution

被引：28

作者：

Shao, Li ^{[1
,2
]}

Wu, Zhengjun ^{[2
]}

Tian, Fengwei ^{[1
]}

Zhang, Hao ^{[1
]}

Liu, Zhenmin ^{[2
]}

Chen, Wei ^{[1
]}

Guo, Benheng ^{[1
,2
]}

机构：

[1] Jiangnan Univ, Sch Food Sci & Technol, Wuxi 214122, Peoples R China

[2] Bright Dairy & Food Co Ltd, Ctr Technol, State Key Lab Dairy Biotechnol, Shanghai 200436, Peoples R China

来源：

INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES | 2015年 / 72卷

基金：

国家高技术研究发展计划(863计划);

关键词：

Lactobacillus rhamnosus; Exopolysaccharides; SEC-MALLS; AFM; Conformation; Solution properties; SIZE-EXCLUSION CHROMATOGRAPHY; ATOMIC-FORCE MICROSCOPY; LIGHT-SCATTERING; INTRINSIC-VISCOSITY; CHAIN CONFORMATION; DILUTE-SOLUTIONS; POLYSACCHARIDE; WATER; MACROPHAGES; WEIGHT;

D O I：

10.1016/j.ijbiomac.2014.10.015

中图分类号：

Q5 [生物化学]; Q7 [分子生物学];

学科分类号：

071010 ; 081704 ;

摘要：

The molecular weight and chain conformation of an exopolysaccharide (EPS), 52, from Lactobacillus rhamnosus KF5 were determined by size-exclusion chromatography combined with multi-angle laser light scattering (SEC-MALLS), dynamic light scattering (DLS), viscometry and atomic force microscopy (AFM). The weight-average molecular weight (M-w), intrinsic viscosity [eta], radii of gyration (R-g) and hydrodynamic radii (R-h) were 7.5 x 10(5) Da, 2.331 dL/g, 44.3 nm and 29.4 nm, respectively. The conformational parameters were calculated from the above data according to the theory of dilute polymer solutions. The Mark-Houwink-Sakurada exponent alpha was found to be 0.687, and the value of the structure-sensitive parameter rho(R-g/R-h) was 1.51. The results revealed that the EPS S2 existed as a random coil conformation in 0.1 M NaNO3 aqueous solution. AFM further confirmed the random coil morphology of this molecule in aqueous solution. EPS S2 present extended chains (fibrous morphology), with circular side chains, dispersed in SDS solution. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：1429 / 1434

页数：6