Mohammad Reza Koushki

Department of  Food Technology Research,National Nutrition and Food Technology Research Institute, Faculty of Nutrition Science and  Food Technology,ShahidBeheshti University of Medical  Sciences, Tehran, Iran.


Pasteurized milk is consumed widely in all socioeconomic classes and consider as the main source of milk for people in Iran. In recent years increased price of pasteurized milk caused by elimination of subsidies resulted decrease in milk consumption and also a possibility of adulterations which may lead to low microbial quality of the products.The present investigation envisaged the microbiological quality of 103 pasteurized milk samples collected randomly from fruit and vegetablesmarkets in Tehran and evaluated them by enumeration of aerobic mesophilic microorganisms, coliforms and detection of Escherichia coli on expiration date. Coliforms, Escherichia coli and aerobic mesophilic microorganisms were in compliance with Iranian National Standard limits in 78.6%, 92/9% and 40.8% of the studied samples, respectively. No significant difference was found between pouches and bottles in terms of Escherichia coli.To conclude, the present study confirmed the partial satisfactory quality of pasteurized milk packages in Tehran urban area. Promotion of public awareness about consumption of pasteurized milk andprecise implementation of HACCP and its prerequisite programs to achieve high quality pasteurized milk is recommended.

Keywords: Pasteurized milk, Microbiological quality, Packaging, Expiration date.