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Identification and measurement of beta-lactam antibiotic residues in milk: integration of screening kits with liquid chromatography.
Journal of AOAC International 1995 July
A procedure for identifying and quantitating violative beta-lactams in milk is described. This procedure integrates beta-lactam residue detection kits with the multiresidue automated liquid chromatographic (LC) cleanup method developed in our laboratory. Spiked milk was deproteinized, extracted, and subjected to reversed-phase LC using a gradient program that concentrated the beta-lactams. Amoxicillin, ampicillin, cephapirin, ceftiofur, cloxacillin, and penicillin G were, thus, separated into 5 fractions that were subsequently tested for activity by using 4 kits. beta-lactams in the positive fractions were quantitated by analytical LC methods developed in our laboratory. The LC cleanup method separated beta-lactam antibiotics from each other and from interferences in the matrix and also concentrated the antibiotics, thus increasing the sensitivity of the kits to the beta-lactam antibiotics. The procedure facilitated the task of identifying and measuring the beta-lactam antibiotics that may be present in milk samples.
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