DPPH
抗氧化剂
化学
单糖
渗透性休克
凝胶渗透色谱法
多糖
食品科学
甘露糖
色谱法
分子质量
清除
生物化学
有机化学
酶
基因
聚合物
作者
Fengrui Yang,Jiuliang Chen,Shuhong Ye,Zhaofang Liu,Yan Ding
标识
DOI:10.1016/j.procbio.2021.12.023
摘要
In this study, the antioxidant properties of exopolysaccharides (EPS) produced by Lysinibacillus sphaericus Ya6 under different osmotic stress were investigated. High-performance liquid chromatography was used to analyse the monosaccharide composition of EPS. High-performance gel permeation chromatography was used to determine the molecular weight of EPS. Results suggested that EPS produced by Lysinibacillus sphaericus Ya6 was a homogenous polysaccharide with molecular weight of 89.62 kDa, which was composed of mannose and glucose. The molecular weight and monosaccharide composition of polysaccharides changed under osmotic stress conditions. In vitro antioxidant determinations found that all EPS had activity of scavenging 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical and superoxide anion. And with the aggravation of osmotic stress, the scavenging activity of EPS produced by Lysinibacillus sphaericus Ya6 on DPPH radical was enhanced from 39.30 ± 0.19 % (control condition) to 72.54 ± 0.3 %.
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