الفهرس 
Risk assessment of some dairy products with special concern to safety issues
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Abstract
A total of 75 ice-cream samples and 75 white soft cheese samples (35 large scale and 40 small scale for each ice-cream and white soft cheese) were collected from street vendors, dairy shops and supermarkets in Cairo and Giza governorates. The collected samples were investigated for different types of hazards including, microbiological, chemical and physical. For microbiological examination; the mean count of total aerobic mesophilic bacteria, psychrotrophic bacteria, coliforms, fecal coliforms, yeast, mold and total staphylococci were 6.32 ±5.8, 5.2±4.5, 4.8 ± 4.4, 5.3 ± 4.7, 6.1 ± 5.8, 3.06 ±2.91, 5.13 ± 4.75, 2.55, 5.9 ± 5.6, 4.9 ± 4.5, 3.0 ± 2.6, 3.1± 2.9, 5.7 ± 5.2, 5.0 ± 4.5 for small and large scale ice-cream samples, respectively; and were 7.47 ± 6.98, 5.77 ±5.28, 6.70 ± 5.67, 5.33 ± 4.83, 7.71 ± 7.13, 3.43 ± 2.88, 6.30 ±5.99, 2.92 ± 2.53, 6.47 ± 5.71, 5.87 ± 5.39, 4.0 ± 3.89, 4.0 ± 3.93, 6.62 ± 5.08 ,5.5 ± 5.13 log cfu/g, for small and large scale white soft cheese samples, respectively. S. aureus was detected with incidence of 12.5%, 55.0%, 11.42% and 37.1% for small scale and large scale samples of ice-cream and cheese, respectively; while E. coli, salmonella, L. monocytogenes couldn’t be detected in all examined samples.For chemical hazards; aflatoxin M1 was examined using a commercial enzyme-linked immunosorbent assay (ELISA) and the obtained results revealed that 80% of the examined ice-cream and white soft cheese samples were contaminated with a mean value of 24.31 ± 8.11 and 14.19 ± 2.48 ppt, respectively. Some of the organochlorine pesticides (OCPs) and Polychlorinated biphenyls pesticides (PCBs) were examined using Gas chromatography (GC-MSMS); OCPs residues couldn’t be detected in all ice-cream samples, while Ü-HCH, Ý-HCH, Þ-HCH, P,P-DDT, o,p-DDT, p,p-DDE and Aldrin were detected in the examined white soft cheese samples with mean values of 0.02 ± 01, 0.03 ± 01, 0.03 ± 01, 0.03 ± 0.01, 0.05 ± 0.02, 0.01, 0.08 ppm., respectively