Preservation of Raw Milk of Khartoum State (Sudan) by the Lactoperoxidase System

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ElYas, Ibtisam
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This study was carried out at Khartoum State to evaluate the hygiene and the quality of milk after preservation with Lactoperoxidase Enzyme System (LPS). The milk was collected directly from a traditional farm, the collection and examination of samples was done during April- June 2005. The result indicated that non significant differences were found for total bacterial counts, coliform counts and acidity in the treated milk samples. Moreover this study showed that total bacterial counts and the acidity were not affected by temperature (room and refrigerator) after treatment with Lactoperoxidase System (LPS). Also the treatment of raw milk with the LPS revealed non significant differences in acidity due to variation of storage temperature. However the result indicated that there were significant differences in total bacterial and coliform counts (p<0.001) of the raw milk stored at both room and refrigerator temperatures. The raw milk samples revealed the presence of five organisms and they were identified as Escherichia colt, Citrobacter freundit, Yersinia enterocolitica, Staphylococcus ctureus and Enterococcus feacalis. However the treated milk (with lactoperoxidase system) revealed the presence of E. feacalis, which take time before it was disappeared (9 days for refrigerated treated milk). Thus the present study encourages the uses of lactoperoxidase enzyme system for preservation of milk where cooling facilities are not available to ensure its safety. However the addition of the enzymes should be done by trained authorized persons.
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Lactoperoxidase system, bacteria, bovine milk, storage, shelf life, Sudan