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《Journal of Huazhong Agricultural》 2005-03
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Survival of Two Lactic Acid Bacteria of Piglet Intestine under Low pH, Bile Salt and Heat Treatment

Wu Huifen Mao Shengyong Yao Wen Zhu Weiyun (College of Animal Science and Technology, Nanjing Agricultural University, Nanjing 210095, China )  
Effects of low pH, bile salt and heat on the survival of strain L5 and L7 were studied. The results showed that there was no obvious effect on the survival of L5 during 150 minute incubation at pH over 2. 5; and L5 was still able to survive well within 30 minute incubation at pH 1. 5. Strain L7 exhibited a lower acid tolerance than L5, and it was only able to survive at pH 3. 5 and 4. 5. Bile salt affected the growth of the two strain, but the effect was minimal within 1 h incubation with bile salt concentration at 1%. Under the same concentration of bile salt, the bacteria counts decreased as incubation proceeded. When the bile salt concentration was over 2%, the survival count was affected severely. Treatment with 50℃ had no effect on survival of L5,but temperature above 80 'C had significant effect on the survival of L5.
【Fund】: 国家自然科学基金项目(30005005)资助
【CateGory Index】: S852.6
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