The role of resistance to bile salts and acid tolerance of exopolysaccharides (EPSS) produced by yogurt starter bacteria
2010
Boke, H., Gazi University, Ankara (Turkey). Faculty of Science and Arts | Aslim, B., Gazi University, Ankara (Turkey). Faculty of Science and Arts | Alp, G., Gazi University, Ankara (Turkey). Faculty of Medicine
The aim of this study was to investigate a possible relation between EPS production and resistance to bile salts and tolerance to low pH. Eight strains which produced the highest and lowest amount of EPS (16-211 mg/l) were selected among 54 bacteria isolated from yogurt. Additionally, they were tested for resistance to bile salts (0.15, 0.3%) and tolerance to low pH (2.0-3.0). After treatment with bile salts and acid, viable bacteria (log cfu ml- 1) were determined by surface plating. The high EPS producing strains (B3, G12, W22) showed a significant (P is less than 0.05) protective effect against low pH (pH 2.0). All Streptococcus thermophilus (W22, T12) and L. bulgaricus (B3, G2) strains showed a significant (P is less than 0.01) protective effect against bile salts (0.3%).
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