标题：The Investigation of Beta-Lactamase by Using Iodometric Test and Chromogenic Cephalosporin Test (Nıtrocephin) in the Bacteria Isolated from White Chees, Raw and Pasteurized Milk Samples
摘要：In the investigation; 197 samples from several different milk companies have been worked between the periods of October 1993 March 1994. Among 197 samples; 103 was raw, 52 was pasteurized milk and 42 was white cheese. A bacterial production has been seen in the 190 samples of totally 197 raw, pasteurized milk and cheese samples where no production has been seen in 7 of them. 597 bacteria have been isolated from 190 samples which shows production in our investigation, the presence of beta-lactamase enzyme of totally 598 isolated bacteria from raw and pasteurized milk and white cheese has been tested by using iodometric test 311 (52.10%) have negative beta-lactamase enzyme. Among 286 beta-lactamase positive bacteria; 142 are isolated from raw milk, 74 from pasteurized milk and 70 from white cheese in the 187 of 286 beta-lactamase positive bacteria; the presence of enzyme has been controlled additionally by using chromogenic cephalosporin test (Nitrocephin) method 128 (44.75%) of 286 beta-lactamase positive bacteria are named as Escherichia coli ; when 40 (13.99%) as Klebsiella ; 36 (12.59%) Enterobacter ; 46 (16.08%) Staphylococcus aureus ; 2 (0.70%) Staphylococcus epidermidis ; 1 (0.35%) Pseudomonas ; 1 (0.35%) Serratia ; 30 (10.49%) Bacillus and 2 (0.70%).
