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《Journal of Anhui Agricultural Sciences》 2008-07
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Study on the Isolation and Identification of Streptococcus thermophilus from Acidophilus Milk and Its Probiotic Characteristics

LI Gong-mei et al (Subject of Preventive Veterinary Medicine,Jilin Agricultural University,Changchun,Jilin 130118)  
[Objective] The aim of the research was to discuss the probiotic characteristics of Streptococcus thermophilus in acidophilus milk.[Method] S.thermophilus was isolated from acidophilus milk by using MRS agar medium to make biochemical identification by sugar fermentation test.The antibacterial characteristics and bile salt tolerance of S.thermophilus were studied and the effects of different pH value on S.thermophilus were analyzed.[Result] The results of microscope detection showed that this bacterium was Gram positive and it was confirmed as S.thermophilus through biochemical identification.S.thermophilus had inhibitory effects on common pathogens in human intestine,especially its inhibitory effects on Escherichia coli and Staphylococcus aureus were obvious.S.thermophilus was tolerant to the bile salt environment in human intestine and survived in its specific site.S.thermophilus could be tolerant to strong acid and survive in gastric acid.It grew well in near-neutral pH value environment.[Conclusion] S.thermophilu could play the probiotic function in human intestine and protect the body from the invasion of pathogens.
【CateGory Index】: TS252.1
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