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Risk assessment of some dairy products with special concern to safety issues / Ahmed Hussein Abdallah Gadallah ; Supervised Abdelhay M. Abouzied , Karima M. Fahim

By: Contributor(s): Material type: TextTextLanguage: English Publication details: Cairo : Ahmed Hussein Abdallah Gadallah , 2020Description: 135 P. : charts , facimiles ; 25cmOther title:
  • تقييم المخاطر لبعض منتجات الألبان مع الأخذ فى الأعتبار عناصر السلامة [Added title page title]
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Dissertation note: Thesis (M.Sc.) - Cairo University - Faculty of Veterinary Medicine - Department of Food Hygiene and Control Summary: 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
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Thesis Thesis قاعة الرسائل الجامعية - الدور الاول المكتبة المركزبة الجديدة - جامعة القاهرة Cai01.10.06.M.Sc.2020.Ah.R (Browse shelf(Opens below)) Not for loan 01010110081493000
CD - Rom CD - Rom مخـــزن الرســائل الجـــامعية - البدروم المكتبة المركزبة الجديدة - جامعة القاهرة Cai01.10.06.M.Sc.2020.Ah.R (Browse shelf(Opens below)) 81493.CD Not for loan 01020110081493000

Thesis (M.Sc.) - Cairo University - Faculty of Veterinary Medicine - Department of Food Hygiene and Control

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

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