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Detoxification of enterotoxigenic Bacillus cereus (JX455159) isolated from meat by a local strain of Lactobacillus plantarum (JX282192)

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Abstract

Raw minced meat samples (25) were randomly collected from different slaughterhouses in Dakhlia and Sharkyia Governorates, Egypt. One hundred and fifty Bacillus species related to the cereus group were isolated from the collected meat samples using Mannitol Yolk Polymyxin (MYP) agar plates. Purified bacterial cultures were then tested for their virulence factors with respect to hemolysin, protease and lecithinase. Of the tested Bacillus strains (150), 81, 95.3 and 76 % of total tested Bacillus strains were positive for hemolysin, protease and lecithinase tests, respectively. The identity of one of the most potent strains suspected and encoded as Bacillus cereus F23 was confirmed by amplifying its 16S rRNA gene. The partial nucleotide sequence of the amplified 16S rRNA gene of the tested strain was submitted to GenBank with accession number JX455159. Multiplex PCR amplification of enterotoxin genes in the tested strain, using specific primers, yielded amplicons of molecular sizes 695 and 565 bp for enterotoxins hblC and cytK, respectively. Thermal resistance of B. cereus F23 (JX455159) spores was determined by calculating D values at 65, 75, 85 and 95 °C for 36, 25, 19 and 16 min, respectively, and the calculated Z value was recorded as 0.119 °C. A lactic acid bacteria (LAB) strain isolated from pickles was preliminary identified as Lactobacillus plantarum F14 (LBF14) and later confirmed by detecting its 16S rRNA gene, and it was submitted to GenBank with accession number JX282192. The identified LAB strain was tested as a bioprotective agent against toxigenic B. cereus F23 spores both in minced meat samples and BHI broth medium. A reduction in B. cereus F23 population between 4 and 6 log cycles under different tested conditions was recorded. The activity of virulence factors (protease and lecithinase) decreased and hemolytic activity was completely inhibited in the presence of 103 CFU/ml of Lactobacillus plantarum F14 (JX282192). Inthe presence of 105 CFU/ml Lactobacillus plantarum F14 (JX282192), protease and lecithinase activities of B. cereus F23 were decreased by 85 and 71 %, respectively.

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Acknowledgment

We thank Prof. Dr. Azza Abozeid, for her encouragement during the investigation.

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  1. Botany and Microbiology Department, Faculty of Science, Zagazig University, Zagazig, Egypt

    Fifi M. Reda

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  1. Fifi M. Reda
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Correspondence to Fifi M. Reda.

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Reda, F.M. Detoxification of enterotoxigenic Bacillus cereus (JX455159) isolated from meat by a local strain of Lactobacillus plantarum (JX282192). Ann Microbiol 64, 287–296 (2014). https://doi.org/10.1007/s13213-013-0662-5

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  • DOI: https://doi.org/10.1007/s13213-013-0662-5

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