Microbiological quality of milk and spray dried skim milk powder used as ice cream ingredients in Karnal
Arora, A.; Sudarsanam, T.S.
Journal of Food Science and Technology (Mysore) 23(1): 170-172
Samples of raw milk from the National Dairy Research Institute (NDRI) at Karnal and from a market source were examined for microbial counts. Milk from both sources had standard plate counts <30 000/ml, the max. prescribed for pasteurized milk, but Gram-negative bacteria and coliforms were present in the NDRI milk. Spray-dried skim milk, prepared from NDRI milk and used in the preparation of ice cream mixes, was shown to be contaminated with coliforms, sporeforming bacteria, yeasts, moulds and staphylococci. Use of pasteurized or boiled milk in the manufacture of ice cream mixes, and storage of dried milk in air-tight containers in dust-free rooms is suggested as a means of avoiding contamination of ice cream mixes.