Anti-Helicobacter pylori Activity of a Lactobacillus sp. PW-7 Exopolysaccharide

Foods

Xueqing Tian¹  Shujun Wang¹  Jingfei Hu¹  Jing Lu¹  Tong Wei¹  Hangjie Wu¹  Mingsheng Lyu¹ 

[1] Jiangsu Key Laboratory of Marine Bioresources and Environment, Jiangsu Key Laboratory of Marine Biotechnology, Jiangsu Ocean University, Lianyungang 222005, China;

关键词: Helicobacter pylori;    Lactobacillus plajomi;    exopolysaccharide;    antibacterial activity;    antioxidant activity;   

DOI  :  10.3390/foods10102453

来源: DOAJ

【 摘 要 】

Helicobacter pylori is a cause of gastric cancer. We extracted the exopolysaccharide (EPS) of Lactobacillus plajomi PW-7 for antibacterial activity versus H. pylori, elucidating its biological activity and structural characteristics. The minimum inhibitory concentration (MIC) of EPS against H. pylori was 50 mg/mL. Disruption of the cell membranes of pathogenic bacteria by EPS was indicated via the antibacterial mechanism test and confirmed through electron microscopy. EPS also has antioxidant capacity. The IC₅₀ of EPS for 2,2-Diphenyl-1-picrylhydrazyl (DPPH) radical, superoxide anions, and hydroxyl radicals were 300 μg/mL, 180 μg/mL, and 10 mg/mL, respectively. The reducing power of EPS was 2 mg/mL, equivalent to 20 μg/mL of ascorbic acid. EPS is a heteropolysaccharide comprising six monosaccharides, with an approximate molecular weight of 2.33 × 10⁴ Da. Xylose had a significant effect on H. pylori. EPS from L. plajomi PW-7 showed potential as an antibacterial compound and antioxidant, laying a foundation for the development of EPS-based foods.

【 授权许可】

Unknown