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Abstract

ANTIBACTERIAL AND PROBIOTIC PROPERTIES OF LACTIC ACID BACTERIA ISOLATED FROM CHICKEN INTESTINE, ENTRAILS OF SWINE, AND SOIL AGAINST GASTROINTESTINAL AND UROGENITAL PATHOGENS

Pannapa Powthong, Pattra Suntornthiticharoen

ABSTRACT

The present work explores the isolation and selection of lactic acid bacteria (LAB) with probiotic potential, and antagonism against important gastrointestinal and urogenital pathogenic bacteria. Two hundreds and one isolates of LAB were isolated from 51 samples including chicken intestines, pig intestines, and fermented fish egg. These 201 isolates were selected for detecting antimicrobial activity against 20 of important gastrointestinal and urogenital pathogenic bacteria, Seventeen isolates exhibited antimicrobial activity. We observed that Enterobacter agglomerans and Citrobacter freundii were the most inhibited pathogen. The strains which revealed the best inhibitory power were CI 5/3 and CI 5/6, showed an opposing effect against almost tested pathogenic bacteria. Probiotic characteristic of the isolated microorganism were tested by observing acid, bile salt and salt tolerant, growth in wide temperature ranges (25 - 45°C), hemolysis pattern on blood agar, resistance to antibiotics and hydrophobicity. Isolates CI 5/3 and CI 5/6 showed probiotic properties. Both isolates were identified by API50CH to be Lactobacillus brevis. Our results demonstrate that some of the LAB strains may be good candidates for potential application as probiotics in animal and human and also as natural food preservatives.

Keywords: Lactic acid bacteria, probiotic, chicken intestine microbial, antimicrobial activity.


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