مقايسه ميزان آلودگي باكتريولوژيكي شيرخام و پاستوريزه در شهركرد در سال 1385

Comparison of bacterial contamination of raw and pasteurized milk used in Shahrekord in 2006

Background and aim: Milk is very important for the human nutrition. Control and monitoring of its preparation, transport, storage and presentation, based on healthy principals is essential. Therefore, this study was aimed to compare bacterial contamination of raw and pasteurized milk used in Shahrekord, Iran in 2006. Methods: This descriptive-analytical study is a descriptive analytical which has been done in 2006 in milk production factories in Shahrekord Township. In this order, 300 samples of raw milk using sterile containers of 200 cc volume, from five points and also randomly 120 samples of pasteurized milk from milk production factories have been gathered, on winter and summer seasons. Coli forms measured using MPN method in lactose broths medium and total count method used for the total bacteria in violate red bile Agar medium. E. coli determined in eosin methylene blue medium and lMVIC tests were used for coli form differentiation. Data were analyzed using descriptive statistics and Chi-square, Mann-Whitney, and Kruskal- Wallistests. Results: The results showed that 208 of300 (70%) and 242 of300 (80.S%) of the raw milk samples were contaminated with E. coli and coli forms, respectively. The most (88%) and the least (%S8.3) rate of contamination were in the samples from southwest and northeast area, respectively (P