Nội dung chính của bài viết
Bacillus clausii has been used as probiotic bacteria in dietary supplements because of its main probiotic activities, including its multi-antibiotic resistance, digestive enzyme production, vitamin synthesis, and immunomodulatory effects. In this study, heat, and acid-stability, acute and sub-acute toxicity were conducted to evaluate the stability and safety of liquid-suspension probiotics (LiveSpo® Clausy, LiveSpo Pharma) containing spores of Bacillus clausii ANA39 strain at ≥ 2 billion CFU/5 mL. The result showed that the B. clausii ANA39 spores were heat-resistant, acid pH-stable, and long-time survivors with the remaining survival rate of 80%, 60%, and 80% at treatment conditions of 800C, pH 2.0 for 20 min, and at 300C for 24 months respectively. Acute toxicity data in mice indicated LD50 was not detectable, even at an extremely high dosage of 60 mL/kg (equivalent to 2.4 x 1010 CFU/kg), indicating LiveSpo® Clausy was an unclassified category. The sub-acute toxicity results showed that the rabbits administrated with B. clausii ANA39 at the dosages of 0.93 mL/kg rabbit/day (equivalent to 0.37 x 109 CFU ANA39 spores/kg rabbit/day) and 2.80 mL/kg rabbit/day (equivalent to 1.12 x 109 CFU of B. clausii ANA39 spores/kg rabbit/day) were healthy and steadily gained weight without any abnormal physiology and anatomy. In conclusion, LiveSpo® Clausy probiotics are resistant to high temperatures and low pH acids, stable for at least 24 months at room temperature, and safe for use as a food supplement.
Chi tiết bài viết
Acid stability, acute toxicity, Bacillus clausii, heat stability, spore, sub-acute toxicity
Tài liệu tham khảo
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