MODIFIED DELVOTEST-P FOR THE QUANTITATIVE ESTIMATION OF PENICILLIN INRAW-MILK

The standard Delvotest P was initially assessed as a screening method for detecting samples with >0.006 IU/ml penicillin which constitutes a failure under current EC legislation. In order to allow the test to b e used for confirmatory purposes it was subsequently modified by dilut ing the sample with antibiotic-free raw milk and the probability of ob taining an accurate (+/- 0.001 IU/ml) result was found to be 59, 75, 8 4, 89, 92, 95, 96 and 87% when 1 to 8 determinations, respectively, we re carried out on a single sample over the concentration range 0 to 0. 008 IU/ml.