Survival and Growth of <I>C. jejuni</I> and <I>C. coli</I> at Low pH
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概要
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The effect of low pH on survival and growth of <I>C. jejuni</I> and <I>C. coli</I> were studied in Brain Heart Infusion broth acidified with hydrochloric, acetic, citric, maleic, succinic, malic or lactic acid. The survival and growth of <I>C. jejuni</I> and <I>C. coli</I> at low pH depended in the type of acid present. The cells of <I>C. jejuni</I> and <I>C. coli</I> died within 3 h at pH 4.0 adjusted with each organic acid at either 10 or 25°C. In broth adjusted to pH 5.0 with lactic or acetic acid, the cells decreased in number within 24 h and 48 h, respectively, at 10°C. At pH 5.0 adjusted with other acids and at 10°C, the cells survived over 48 h. The cells of <I>C. jejuni</I> held for 48 h at 25°C decreased in number in broth adjusted to pH 5.5 with any organic acid. <I>C. jejuni</I> and <I>C. coli</I> grew at pH 5.7 acidified with hydrochloric, citric, succinic, malic or lactic acid; however they failed to grow at the same pH value acidified with acetic or malic acid. The lowest pH at which <I>C. jejuni</I> and <I>C. coli</I> grew in these acids was 6.5.
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