Abstract
Objectives: The objective of this study was to assess the keeping quality of powder milk sold at local markets in Mansoura City, Egypt, and to isolate the contaminated bacteria particularly Salmonella spp., E. coli and Staphylococcus aureus from these milk samples. Materials and methods: A total of 50 powder milk samples were collected from different sources at Mansoura, Egypt. The samples were subjected for physical examination to determine their pH and acidity. Microbiologcal assessment of the samples were done by Total Bacterial Count (TBC), Total Coliform Count (TCC), True fecal E. coli count, and Most Probable Number (MPN), and Total mold and yeast count. Results: Minimum and maximum values of TBC were 0.45×102 cfu/gm and 5.11×103 cfu/gm milk powder, respectively. On the other hand, minimum and maximum values of fungal count were 0.08×102/gm and 2×102/gm samples, respectively. No E. coli and Salmonella spp. could be isolated from the samples. However, 18% (n=9/50) samples were found to be contaminated with Staph. aureus. Conclusion: Based on the Egyptian Standards, the samples were satisfactory in terms of the association of Salmonella spp., E. coli, and fungi. Contamination with Staph. aureus warrans the public health. Thus, appropriate care and preventive measures are suggested.
Highlights
Milk is a highly nutritious food that serves as an excellent growth medium for a wide range of microorganisms (Rajagopal et al, 2005)
Microbiologcal assessment of the samples were done by Total Bacterial Count (TBC), Total Coliform Count (TCC), True fecal E. coli count, and Most Probable Number (MPN), and Total mold and yeast count
The samples were subjected for microbiological analyses; for this, Total Viable Count (TVC), Most Probable Number (MPN), Total Coliform Count (TCC), and molds and yeasts counts were performed according to the methods described by Richter et al (1992), Masud et al (2012), Nazir et al (2005a) and Nasrin et al (2007)
Summary
Milk is a highly nutritious food that serves as an excellent growth medium for a wide range of microorganisms (Rajagopal et al, 2005). Poor sanitary practices in processing and may cause public health hazard due to the presence of pathogenic bacteria, mold and yeast. Various bacteria of public health concern such as Salmonella spp., Listeria monocytogenes, Campylobacter jejuni, Yersinia enterocolitica, pathogenic strains of Escherichia coli and enterotoxigenic strains of Staphylococcus aureus may be found in milk and dairy products (Tatini and Kauppi, 2003). For this reason, emphasis should be given on the quality and microbiological assessment of milk powder, which is crucial for the assessment of quality and safety, conformation with standards and specifications, and regulatory compliance. This study was undertaken to assess the keeping quality of powder milk sold at local markets in Mansoura City, Egypt, and to isolate Salmonella spp., E. coli and Staph. aureus from powder milk
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