Causes of anomalous results in BRT~(R) test used for detection of antibiotic residuals in milk

摘要

In the present study, 273 milk samples from dairy cows which did not receive pharmacological treatment neither feeding with medications during the experiment, were analyzed. On each milk sample, the BRT~(r) inhibitor microbiology test answer, chemicalcomposition (fat, protein, lactose, total solid and solids-not-fat), somatic cell count (SCC) and concentration of the lactoperoxidase system components (LP: lactoperoxidase activity, SCN: thiocyanate, H_2O_2: hydrogen peroxide) were determined in order to study their possible influence on anomalous results. A logistical regression model using a stepwise approach indicated that milk samples with high protein percentage (3.32 g/100g) and high H_2O_2 concentrations (4.48 mg/ml) are the cause of positive false results, in comparison with the negative samples that presented lower levels of proteins (3.27 g/100g) and [H_2O_2] (2.23 mg/ml).