Journal of Dali University ›› 2022, Vol. 7 ›› Issue (8): 33-36.

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Detection of Common Pathogenic Bacterium in the Ghee Made by Ethnic Minority Farmers in an Area of Yunnan

Chen Zhaofang12Cao Xiaolan1Yu Wenjing1Du Juan1Wu Youcong1*   

  1. 1.Pre-clinical College Dali University Dali Yunnan 671000 China 2. Department of Basic Medicine Dali Nursing Vocational College Dali Yunnan 671000 China

  • Received:2021-06-24 Revised:2021-07-09 Online:2022-08-15 Published:2022-09-16

Abstract: Objective: To investigate the microbiological indexes in the ghee made by ethnic minority farmers in an area of Yunnan, and to provide reference for the food safety of the ghee. Methods: 35 ghee samples were collected. The total number of bacteria and molds/yeast in the samples were detected after a series of dilution, and the food-borne pathogens were identified according to colony characteristics, morphological staining and biochemical reaction. Results: Bacteria were detected in all the 35 samples(100.0% detection rate), the logarithm value of CFU(lgCFU) in the 35 samples ranged from 4.08 to 5.31 per gram, and the total number of bacteria in 26 ghee samples(74.3% exceeding standard rate) exceeded the standard number. Molds/yeasts were detected in 31 samples(88.6% detection rate), with lgCFU value of 2.00-4.98 per gram, and bacteria in these 31 samples all exceeded the standard in CFU counting. Additionally, intestinal pathogens were detected in 4 species(11.4% detection rate); 3 strains were suspected as Shigella species, and 1 as Proteus species. Staphylococcus aureus and Escherichia coli were not detected in the samples. Conclusion: The sanitary microbiological index of the ghee in this area is worrying. The mold contamination is serious, and intestinal pathogens are isolated from some samples.

Key words:

ethnic minority">; homemade ghee">; total number of colonies">; pathogenic bacterium

CLC Number: