Japanese Journal of Food Microbiology
Online ISSN : 1882-5982
Print ISSN : 1340-8267
ISSN-L : 1340-8267
Antibacterial Action of Kefir against Escherichia coli O157: H7
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Keywords: Kefir, E. coli O157: H7, pH

1999 Volume 16 Issue 4 Pages 245-247


Kefir, which is a fermented milk product that was recently introduced in Japan is becaming available for widespread consumption.
Because there is the effect of controlling the growth of food poisoning bacteria in acid milk, it is expected that the growth of E. coli O157: H7 in kefir can be similarly controlled. When E. coli ATCC or E. coli O157: H7 was cultivated in a pH-neutral condition, the growth of the bacterium was not influenced at all regardless of the presence of kefir. On the other hand, when E. coil ATCC or E. coli O157: H7 was cultivated in pH-acid condition, the growth of these was markedly inhibited. The growth of E. coli ATCC of 109 cfu/ml or E. coli O157: H7 of 107 cfu/ml to which kefir of pH 4 was added was especially completely inhibited in a short time.
These results suggested that an antibacterial substance to the growth of E. coli ATCC or E. coli O157: H7 was existed in kefir.

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