Probiotic potential of Lactobacillus strains isolated from Lighvan yoghurt

This study investigates probiotic capability of Lactobacillus strains got from 5 samples of yogurt were gathered from provincial territory of Lighvan. Totally 100 strains were identified as Lactobacillus by phonotypical and biochemical testes. Then probiotic potential properties including ability to survive in reenacted gastrointestinal condition, resistance to bile salts, hindrance of pathogenic bacteria, and susceptibility of antibiotic discs were done. 34 strains survived in acidic and bile condition. Among these 34 strains, 15 Lactobacillus strains including Y1 to Y15 showed good probiotic potential. Y1, Y5 and Y13 were resistant to all the used bile concentrations. All strains had strong resistance to vancomycin, streptomycin and gentamicin antibiotic disks. Y12 strain prevent the growth of all foodborne pathogens.Y3 strain showed highest (88.45%) and Y9 strain showed lowest viability (58.26%) in simulated gastrointestinal condition. All the strains demonstrated low sensitivity to the presence of conjugated bile salts. Y1, Y5, Y6, Y10, Y11 and Y15 strains exhibited the most elevated enzymatic activity of β-galactosidase. Y7 strain generated the highest amount (P