University of Khartoum

Study on the quality of pasteurized milk in Khartoum, Sudan

Study on the quality of pasteurized milk in Khartoum, Sudan

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Title: Study on the quality of pasteurized milk in Khartoum, Sudan
Author: Elmagli, Ali Ahmed Osman
Abstract: The present study was conducted to investigate the effects of storage conditions on the quality and shelf life of pasteurized milk in Khartoum State. Three areas were selected in Khartoum North State. (Halfaia, Safia and mahata El wsta) according to fluctuations in their electrical supply and immediate marketing. Sixty samples were collected from these areas. Other twenty samples were stored at 7OC in the laboratory, of the department of dairy production Faculty of Animal Production. These samples were examined to determine the total number of bacteria, coliform bacteria, Escherichia coli counts and, psychrotrophic bacterial count, the presence of Salmonella. and Proteus spp., in the pasteurized milk were also reported. Similarly, some physical and chemical tests were conducted to determine the percentages of fat, protein, ash, lactose, total solids and acidity. The counts of total bacteria were found to range between 65×104 and 65×1013 psychrophilic bacteria were between 65×104 and 65 ×1013, coliform between 65×103 and 65×1011 and of the E. coli between 0 and 65×1010. Using statistical analysis, the results showed that there were differences between counts, which reflected that storage conditions had effects on bacteria. The results also showed that pasteurized milk samples were free from Salmonella spp. whereas Proteus spp. were found in 20% of the samples examined. 6 Chemical and physical properties of pasteurized milk showed the following range of values: fat between 1%- 2.8% (2.12510 ±0.3042), titratable acidity was 0.14% -0.86% (0.2194±0.1718), protein was 2.13%- 3.6% (2.8254± 0.3203), lactose was 2.13%- 4.8% (3.8177± 0.5547) ash 0.33%- 0.69% (.6098± .06805), total solids was 4.03%- 11.32% (9.2824± 1.1982) and the freezing point was - 0.41-0.67 (-0.4734± 0.05032). The storage conditions showed significant effects (p<0.001) on chemical and physical properties of pasteurized milk. The results showed that 4% and 6% of the samples were positive to the phosphates test in storage 1 and 11, respectively. The present study concluded that the pasteurized milk distributed in Khartoum State was of low quality. Hence it was recommended that quality assurance programmes should be started to ensure that good quality milk and milk products are produced and consumed in the country
URI: http://hdl.handle.net/123456789/7989
Date: 2015-04-01


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