津晋地区原料奶中微生物污染程度分析与鉴定

Analysis and Identification on Contamination Status of Raw Milk in Tianjin and Shanxi Regions

沙门氏菌是一种重要的人畜共患肠道疾病致病菌,它引起的食物中毒已成为一类最常见且危害性较大的细菌性食物中毒。本研究对我国津晋地区原料奶中微生物污染情况进行分析与鉴定,主要包括菌落总数、大肠菌群和沙门氏菌的检测。结果显示:津晋地区原料奶来源不同,奶源质量有较大差别。菌落总数平均在104～107CFU/mL之间,存在许多超标奶;大肠菌群数差别较大,晋奶源质量很好,大肠菌群数均低于110MPN/mL,天津地区乳品厂A大肠菌群数最高为1100MPN/mL,乳品厂B受到大肠菌群的严重污染,几乎均大于或等于11000MPN/mL;沙门氏菌未检出。研究证实了津晋地区原料奶的质量和安全性不容忽视。

Salmonella is one of the most important gastrointestinal pathogens for human and animals.Approximately 70% 80% of bacterial food poisoning cases are caused by Salmonella in China.Therefore,food poisoning caused by Salmonella has become one of the most common and comparatively pernicious bacterial species.The contamination in raw milk from Tianjin and Shanxi regions in China was investigated by determining total bacterial count and coliform bacteria and Salmonella bacteria.The results indicated that the quality of raw milk from different sources in the two regions exhibited a great difference.The average total bacterial counts varied from 104 CFU/mL to 107 CFU/mL.Most of the tested samples could meet the quality standard and few of them were unqualified.However,coliforms bacterial count exhibited tremendous difference among samples from different sources.The quality of raw milk from Shanxi region was better than that from Tianjin region.The coliforms bacterial count was lower than 110 MPN/mL in the samples from Shanxi region.However,The coliforms bacterial count in the samples from Factory A were up to 1100 MPN/mL and from Factory B were no less than 11000 MPN/mL,respectively,although no Salmonella was detected.Therefore,the quality and safety issues of raw milk from the two regions can not be ignored.