Safety Assessment and Probiotic Evaluation of Enterococcus Faecium YF5 Isolated from Sourdough |
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Authors: | Qianglai Tan Hengyi Xu Zoraida P Aguilar Shanshan Peng Suqin Dong Baogui Wang Ping Li Tingtao Chen Feng Xu Hua Wei |
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Affiliation: | 1. State Key Laboratory of Food Science and Technology, Nanchang Univ., 235 Nanjing Donglu, Nanchang 330047, P.R. China, Jiangxi‐OAI Joint Research Inst., Nanchang Univ., , Nanchang, China;2. State Key Laboratory of Food Science and Technology, Nanchang Univ., , Donglu, Nanchang 330047, P.R., China;3. Dept. of Immunochemistry, Covance Laboratories, Inc., , Chantilly VA, U.S.A.;4. Jiangxi‐OAI Joint Research Inst., Nanchang Univ., , China |
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Abstract: | Enterococcus faecium YF5, a strain previously isolated from sourdough, was assessed for safety and probiotic potential. Its virulence and antibiotic resistant phenotypes (cytolysin and gelatinase production, antibiotic susceptibility) and genes (cylA, gelE, ace, agg, esp, and vanA) were surveyed. Results indicated that the tested virulence determinants were nontoxic. In addition, E. faecium YF5 was sensitive to 3 antibiotics such as amoxicillin, vancomycin, and chloramphenicol. Furthermore, results of in vivo animal acute oral toxicity of E. faecium YF5 studies were similar to the control group that indicated no abnormalities. In addition, E. faecium YF5 stably survived in low pH, bile salts, gastric, and intestinal fluids in vitro. Moreover, E. faecium YF5 was found to adhere to human colon cancer cell line HT‐29 at 3.39 (±0.67) × 105 CFU/mL. When cocultured with pathogenic organisms (Enterobacter sakazakii CMCC45402, Escherichia coli CMCC44102, enterohemorrhage Escherichia coli O157: H7 CMCC44828, Salmonella Typhimurium CMCC50071, Shigella flexneri 301, and Shigella sonnei ATCC 29930) and 2 gram‐positive strains (Listeria monocytogenes CMCC54001 and Staphylococcus aureus CMCC 26003), it inhibited these foodborne pathogens with exception of S. aureus. Therefore, E. faecium YF5 can be regarded as a safe strain and it may be used as a probiotic preparation or for microecologics. |
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Keywords: | Enterococcus faecium probiotic evaluation safety assessment sourdough |
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