Safety and quality aspects of dried milk products / Aml Elsayed Ibrahim Eldesoky ; Supervised Nagah Moustafa Hafiz , Mena Fouad Saad

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

Samples of fifty whole milk powder and thirty of each skim milk powder, powdered infant milk formula and milk-cereal based infant formula were collected from various shops, supermarkets and pharmacies in Giza and Cairo Governates, Egypt. Whole and skim milk powder samples were graded according to their sensory parameters and its evaluation were revealed that 60.00% and 56.67% of excellent quality, respectively. By analysis of their chemical compositions (moisture%, total solids%, fat%, protein%, and titratable acidity %); all samples were within range established by Egyptian standards. Lead and mercury were measured in a mean value of 0.243 ± 0.069 and 0.261 ± 0.052 mg/kg for whole milk powder samples in a percentage of (68.00 & 34.00%), while 0.150 ± 0.037 and 0.347 ± 0.110 mg/kg in a percentage of (66.67 & 40.00%) for skim milk powder, respectively. In addition, lead, cadmium, aluminum, arsenic and mercury were measured in a range concentration of 0.384-0.480, 0.014-0.015, 0.296-0.761, 0.174-0.233 and 0.236-0.345 mg/kg of the examined powdered infant milk formula. All dried samples were investigated to the presence of melamine and cyanuric acid, melamine could be detected in 30.00% of whole milk powder, 73.33% of skim milk powder, 66.67% of powdered infant milk formula and 83.33% milk-cereal based infant formula samples, but cyanuric acid was not detected in all samples. Total aerobic bacteria were present in mean values of 4.97 {u00D7} 102 ±1.21 {u00D7} 102, 2.25 {u00D7} 102 ±0.40 {u00D7} 102, 0.23 {u00D7} 102 ± 0.02 {u00D7} 102 and 3.47 {u00D7} 102 ± 0.50 {u00D7} 102 CFU/g for whole milk powder, skim milk powder, powdered infant milk formula and milk-cereal based baby formula, respectively. While mean values of aerobic spore formers were as follows: 4.33 {u00D7} 102 ±1.625 {u00D7} 102, 0.36 {u00D7} 102 ±0.064 {u00D7} 102, 0.25 {u00D7} 102 ±0.026 {u00D7} 102 and 2.39 {u00D7} 102 ±0.322 {u00D7} 102 CFU/g of 50 samples of whole milk powder, 23/30 of skim milk powder, 30 of powdered infant milk formula and 30 milk-cereal based infant formula, respectively. Yeasts were only found in two whole milk powder samples with a mean value of 0.65 {u00D7} 102 ± 0.05 {u00D7} 102 CFU/g

Issued also as CD