Studies on acid, bile salt and heat tolerance of two strains of enterococcus f aecium from swine
2008
Yang Guimei | Zhang Yonghong | Su Na
chinois. 为了筛选动物肠道中的有益优势菌，研究了2株分离自猪肠道的益生性屎肠球菌（E1，E7）的耐受特性。本试验设pH2，2．5，3，4的4个处理组，以pH7为对照组；设胆盐浓度分别为0．2％，0．4％，0．6％，0．8％，1％的5个处理组，以不含胆盐的培养液为对照组；温度设50，80，90℃，以37℃为对照，分别作用5，10，15，20min，经该3种方法处理后各取100μL培养液用细菌稀释计数法测定活菌数。结果表明：E1，E7都有较强的耐酸能力，在pH2时，作用2h后仍能检测到活菌。胆盐浓度达到0．4％时，E1，E7仍有一定的耐受能力，随胆盐浓度升高至0．6％时，活菌数由10. .2 CFU／mL降到10. .5 CFU／mL。2菌株在不同温度下经不同作用时间处理后呈不同的生长态势。[著者文摘]
Afficher plus [+] Moins [-]anglais. Tolerance of two strains of Enterococcus faecium from swine intestine to acid, bile salt and thermal tolerance was investigated. The pH value were 2, 2. 5, 3, 4, pH7 as the control ; The concentration of bile salt were 0.2%, 0.4%, 0.6%, 0.8%, 1%, culture fluid of free bile salt as the control; The two strains were treated with 50, 80, 90 ℃ for 5, 10, 15, 20 min respectively,100μL of culture solution from three kinds of disposals, were obtained to determine the survival counts by dilution method of bacteria counting. The results showed that E1 and E7 had significant acid resistance, the survival counts of E1 and E7 could be detected when pH value was at 2 after two hours. The survival counts of E1 and E7 could be detected when incubated in medium with 0. 4% bile salt, but declined from 10. .2CFU/mL to 10. .5CFU/mL while the concentration of bile was increased to 0. 6 %.
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