Monoclonal antibody-based enzyme-linked immunosorbent assay for the aminoglycoside antibiotic kanamycin in foodstuffs

Monoclonal antibodies to the aminoglycoside antibiotic kanamycin (KM) were obtained as a result of the complex immunization of mice with glutaraldehyde conjugates of BSA with KM, tobramycin (TM), and gentamicin. With the use of these antibodies, an indirect competitive enzyme-linked immunosorbent assay was developed. This method allows for the determination of up to 1.2 ng/ml of an antibiotic in water solutions, milk, and eggs, and up to 2.5 ng/ml in honey. The recovery rate in these products spiked with KM was 83, 84, and 96%, respectively. The assays of KM based on homologous and heterologous solid-phase conjugates were estimated. Under these conditions the cross-reactivity with TM could vary from 7 to 54%. The same indexes for amikacin were more constant and reached 7–8%. The other aminoglycosides showed no inhibitory activity.