alexa The safety of Bacillus subtilis and Bacillus indicus as food probiotics.
Food & Nutrition

Food & Nutrition

Journal of Probiotics & Health

Author(s): Hong HA, Huang JM, Khaneja R, Hiep LV, Urdaci MC,

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Abstract AIMS: To conduct in vitro and in vivo assessments of the safety of two species of Bacillus, one of which, Bacillus subtilis, is in current use as a food supplement. METHODS AND RESULTS: Cultured cell lines, Caco-2, HEp-2 and the mucus-producing HT29-16E cell line, were used to evaluate adhesion, invasion and cytotoxicity. The Natto strain of B. subtilis was shown to be able to invade and lyse cells. Neither species was able to adhere significantly to any cell line. The Natto strain was also shown to form biofilms. No strain produced any of the known Bacillus enterotoxins. Disc-diffusion assays using a panel of antibiotics listed by the European Food Safety Authority (EFSA) showed that only Bacillus indicus carried resistance to clindamycin at a level above the minimum inhibitory concentration breakpoints set by the EFSA. In vivo assessments of acute and chronic dosing in guinea pigs and rabbits were made. No toxicity was observed in animals under these conditions. CONCLUSIONS: Bacillus indicus and B. subtilis should be considered safe for oral use although the resistance of B. indicus to clindamycin requires further study. SIGNIFICANCE AND IMPACT OF THE STUDY: The results support the use of B. subtilis and B. indicus strains as food supplements. This article was published in J Appl Microbiol and referenced in Journal of Probiotics & Health

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