Variation of levels of aflatoxin M1 in raw milk from different localities in the central areas of Punjab, Pakistan

The occurrence of aflatoxin M-1 (AFM(1)) in samples of raw milk of buffaloes and cows from different localities in the central areas of Punjab, the province of Pakistan, was determined by using high-performance liquid chromatography (HPLC) with prior clean-up step applying immunoaffinity columns. The present study has been designed to find out the variation of levels of aflatoxin M-1 in raw milk of different localities. Feed has major role for prevalence of aflatoxin M, in milk and different feed regimen is being used in different areas. Total 480 milk samples were analyzed, among these 360 were of buffalo milk and 120 were of cow milk. The percentage of AFM(1) contamination in buffalo milk and cow milk was 42.5% and 52.5%, respectively. The mean value of AFM(1) was 0.027 mu g L-1 in buffaloes' milk and was 0.044 mu g L-1 in cows' milk. In both types of milk, level of AFM(1) concentration was higher in milk samples obtained from urban and semi-urban areas and it was minimal in milk from rural areas. (C) 2007 Elsevier Ltd. All rights reserved.