畜牧与饲料科学 ›› 2017, Vol. 38 ›› Issue (8): 1-1.doi: 10.12160/j.issn.1672-5190.2017.08.001

• 基础科学 • 上一篇    下一篇

酸驼乳中益生乳酸菌的分离筛选

张七斤;吕天星;于晨龙;陈光明;苏日娜;李智   

  1. 内蒙古农业大学,内蒙古呼和浩特010018
  • 出版日期:2017-08-20 发布日期:2017-08-20
  • 通讯作者: 张七斤
  • 作者简介:张七斤(1966-),男,教授,博士,硕士生导师,主要研究方向为动物传染病诊断及防治和动物微生态。
  • 基金资助:
    国家自然科学基金项目(31160508).

Isolation and Screen of Probiotic Lactic Acid Bacteria from Traditional Fermented Camel Milk

ZHANG Qi-jin, LU Tian-xing, YU Chen-long, CHEN Guang-ming, Surina, LI Zhi (Inner Mongolia Agricultural University, Hohhot 010018, China)   

  • Online:2017-08-20 Published:2017-08-20

摘要: 旨在评价酸驼乳中乳酸菌的益生特性。采用常规方法从内蒙古阿拉善牧区采集的酸驼乳中分离乳酸菌;利用16S rDNA PCR及序列分析法对分离到的乳酸菌进行种水平鉴定;通过体外抑菌试验和耐酸、耐胆盐试验评价乳酸菌的益生特性。结果表明,从酸驼乳中分离到的1株疑似乳酸菌被鉴定为短乳杆菌,将其命名为Lactobacillus breris LT;该菌株的代谢产物对4种常见肠道性致病菌(大肠杆菌、金黄色葡萄球菌、鼠伤寒沙门菌、单增李斯特菌)均表现出良好的抑菌特性,且抑菌特性不受胃蛋白酶和胰蛋白酶的影响;该菌株能够在低pH值(2.0、3.0)和高胆盐含量(0.1%-0.3%)的MRS培养基上生长。该研究结果为酸驼乳中优质乳酸菌资源的开发利用提供了科学依据。

Abstract: This study aimed to assess the probiotic features of the lactic acid bacteria from traditional fermented camel milk. Isolation of the lactic acid bacteria from traditional fermented camel milk produced in pastoral area of Alxa of Inner Mongolia was performed with conventional techniques; the isolate was identified to species level by using 16S rDNA PCR and sequence analysis; the probiotic features of the isolate were evaluated by bacteriostatic test in vitro and acid tolerance as well as bile tolerance tests. The results showed that a suspected lactic acid bacteria strain was isolated from the traditional fermented camel milk and was confirmly identified as Lactobacillus breris (designated as Lactobacillus breris LT); the metabolic products of the isolate exhibited good antibacterial activity against the common enteric pathogenic bacteria (Escherichia coli, Staphylococcus aureus, Salmonella typhimurium, Listeria monocytogenes ) which was not inhibited by the digestion of pepsin and trypsin; the growth of the isolate in MRS agar with low pH value (2.0 and 3.0) and high concentrations of bile (0.1%-0.3%) was observed. Our study provides a scientific basis for the development and application of excellent lactic acid bacteria resources in traditional fermented camel milk.

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