Inhibition of Clostridium perfringens by a novel strain of Bacillus subtilis isolated from the gastrointestinal tracts of healthy chickens

Applied and Environmental Microbiology
Alex Yeow-Lim Teo, Hai-Meng Tan

Abstract

The objectives of this study were to isolate beneficial strains of microorganisms from the gastrointestinal tracts of healthy chickens and to screen them against Clostridium perfringens, a causative agent of necrotic enteritis in poultry. One of the bacteria isolated, a strain of Bacillus subtilis, was found to possess an anticlostridial factor that could inhibit the C. perfringens ATCC 13124 used in this study. The anticlostridial factor produced by B. subtilis PB6 was found to be fully or partially inactivated in the presence of pronase, trypsin, and pepsin. In contrast, the antimicrobial activity of the anticlostridial factor was not affected by treatment at 100 or 121 degrees C or by treatment with any of the organic solvents used in the study. The optimum growth temperature and optimum pH for production of the anticlostridial factor were 37 degrees C and 6.20, respectively. Using the mass spectroscopy-mass spectroscopy technique, the apparent molecular mass of the anticlostridial factor was estimated to be in the range from 960 to 983 Da. In terms of the antimicrobial spectrum, the anticlostridial factor was inhibitory toward various strains of C. perfringens implicated in necrotic enteritis in poultry, Clostridium diffici...Continue Reading

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