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  • Title: Confirmatory test results on milk from commercial sources that tested positive by beta-lactam antibiotics screening tests.
    Author: Moats WA.
    Journal: J AOAC Int; 1999; 82(5):1071-6. PubMed ID: 10513009.
    Abstract:
    Fifty-four milk samples from commercial sources that tested positive for beta-lactam antibiotics were analyzed by a multiresidue liquid chromatographic (LC) procedure based on LC fractionation. Penicillin G and cephapirin were the beta-lactam antibiotics found most frequently. Some samples did not contain detectable beta-lactam antibiotics. In a few, the presence of a beta-lactam antibiotic was suspected because certain LC fractions tested positive for antimicrobial activity, which was no longer present in a replicate treated with beta-lactamase. However, the unknowns could not be identified by LC analysis.
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