Characterization and Immunological Activity of Exopolysaccharide from Lacticaseibacillus paracasei GL1 Isolated from Tibetan Kefir Grains

被引：14

作者：

Wang, Xiaomeng ^{[1
]}

Tian, Juanjuan ^{[1
]}

Zhang, Xueliang ^{[1
]}

Tang, Nanyu ^{[1
]}

Rui, Xin ^{[1
]}

Zhang, Qiuqin ^{[1
]}

Dong, Mingsheng ^{[1
]}

Li, Wei ^{[1
]}

机构：

[1] Nanjing Agr Univ, Coll Food Sci & Technol, Weigang Rd, Nanjing 210095, Peoples R China

来源：

FOODS | 2022年 / 11卷 / 21期

基金：

中国国家自然科学基金;

关键词：

Lacticaseibacillus paracasei GL1; exopolysaccharide (EPS); structure characterization; immunomodulatory activity; LACTIC-ACID BACTERIA; STRUCTURAL-CHARACTERIZATION; STAPHYLOCOCCUS-AUREUS; POLYSACCHARIDES; PURIFICATION; STRAIN; OPTIMIZATION; MACROPHAGES;

D O I：

10.3390/foods11213330

中图分类号：

TS2 [食品工业];

学科分类号：

0832 ;

摘要：

Two exopolysaccharide fractions (GL1-E1 and GL1-E2) of Lacticaseibacillus paracasei GL1 were isolated with the molecular weights of 3.9 x 10(5) Da and 8.2 x 10(5) Da, respectively. Both fractions possessed mannose, glucose, and galactose in molar ratios of 1.16:1.00:0.1, and 3.81:1.00:0.12, respectively. A structural arrangement of two fractions was proposed by methylation, one-dimensional and two-dimensional nuclear magnetic resonance experiments. The backbone of GL1-E1 consisted of -> 4)-alpha-D-Glcp(1 ->, -> 3,4)-alpha-D-Manp(1 ->, -> 3,6)-alpha-D-Manp(1 ->, -> 6)-alpha-D-Manp(1 ->, and -> 6)-alpha-D-Galp(1 -> with alpha-D-Glcp at branching point. The backbone of GL1-E2 consisted of -> 4)-alpha-D-Glcp(1 ->, -> 3,4)-alpha-D-Manp(1 ->, -> 3,6)-alpha-D-Manp(1 ->, -> 6)-alpha-D-Manp(1 ->, -> 6)-alpha-D-Galp(1 ->, and -> 4)-beta-D-Manp(1 ->, and the side chain also consisted of alpha-D-Manp residue. In addition, the differential scanning calorimetry (DSC) analysis indicated that both GL1-E1 and GL1-E2 had good thermal stability. Furthermore, the two fractions could promote the viability of RAW264.7 cells and exert an immunomodulatory role by enhancing phagocytosis, increasing nitric oxide (NO) release and promoting the expression of cytokines.

引用

页数：18

共 55 条

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