Investigation of Beta-Lactam Residues in Unpacked Milk Consumed in Sanliurfa

Summary: It was aimed to investigate qualitatively the detection of beta-lactam residues in milk samples consumed in Sanliurfa region. The samples were collected in winter and summer seasons. In the experiments, Bacillus stearothermophilus was used as the sensitive microorganism. 96 of 300 milk samples were positive for inhibitory substances. Of positive results, 64 samples contained beta-lactam antibiotics and 32 samples were related to other residues that have antimicrobial activity. This study showed that ratio of the milk samples contained beta-lactam and other antimicrobial residue was high.