Research Article Open Access

Microbiological Quality of Heat-Treated Milk During Storage

Authors

Nagla Bourae Ahmed Hassan
Department of Food Science and Technology, Faculty of Agriculture, University of Khartoum, Shambat, P.O. Box 32, Postal Code 13314, Khartoum North, Sudan
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Mohamed Osman Mohamed Abdalla
Department of Dairy Production, Faculty of Animal Production, University of Khartoum, Khartoum, Sudan
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Abdel Azim Ahmed Mohamed Nour
Department of Food Science and Technology, Faculty of Agriculture, University of Khartoum, Shambat, P.O. Box 32, Postal Code 13314, Khartoum North, Sudan
Published on: November 15, 2009
DOI 10.3923/pjn.2009.1845.1848
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Abstract

This study was carried out to evaluate the microbial load of heat treated milk during storage. Collected raw milk samples were subjected to heat treatment at 98oC for 1.87 min (High Pasteurization, HP) and 85oC for 40 min (Low Pasteurization, LP) in addition to Ultra High Temperature Treated (UHT) milk samples which were purchased from local market. Milk samples were subjected to microbial examination, titratable acidity and pH at 1, 10, 20 and 30 day intervals. Results indicated that total bacteria and lactic acid bacteria count significantly increased with time during storage period, together with increase in titratable acidity of all samples tested, while pH gradually decreased towards the end. The following genera were isolated from milk samples: Bacillus, Micrococcus, Saphylococcus, Enterobacter, Pseudomonas, Streptococcus, Pediococcus and Lactobacillus.

Keywords:

HP milk, LP milk, microbiological examination, storage period, UHT milk

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Copyright (c) 2009 Asian Network for Scientific Information

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This work is licensed under a Creative Commons Attribution 4.0 International License.

This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution and reproduction in any medium, provided the original author and source are credited.

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How to Cite

Ahmed Hassan, N. B., Mohamed Abdalla, M. O., & Mohamed Nour, A. A. A. (2009). Microbiological Quality of Heat-Treated Milk During Storage. Pakistan Journal of Nutrition, 8(12), 1845–1848. https://doi.org/10.3923/pjn.2009.1845.1848
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