Development of a monoclonal antibody assay and a lateral flow strip test for the detection of paromomycin residues in food matrices

A monoclonal antibody (MAb) was produced against paromomycin and used in the development of an immunoassay and a lateral flow strip test for the detection of paromomycin residues in food matrices. The MAb had 25.1% cross-reactivity with neomycin, but was insensitive to other aminoglycosides. Tested under optimized conditions in 0.01 M phosphate-buffered saline, the half maximum inhibitory concentration (IC50) of the MAb was 0.61ng/ml for paromomycin and 2.43ng/ml for neomycin, with results obtained within 90min. The mean recoveries from spiked food matrices were within the range of 64.56-105.85% for paromomycin and 54.08-100.55% for neomycin. The strip test results for different food matrices were obtained within 5min and showed visual detection limits of 2.5-20ng/ml (mu g/kg) for paromomycin and 10-30ng/ml for neomycin. Therefore, the developed immunoassay and strip test can be used in food analysis for routinely monitoring not only paromomycin but also neomycin residues.