Provision of Ultrasensitive Quantitative Gold Immunochromatography for Rapid Monitoring of Olaquindox in Animal Feed and Water Samples

Olaquindox (OLA), used as a medicinal feed additive, has been put under ban due to hazard concerns over animal-derived food security. In this study, a simple, rapid, ultrasensitive, and quantitative gold immunochromatography assay (GICA) was established to analyze OLA in animal feed samples and surface water samples to monitor food security. Various trying has been experimented to improve the sensitivity. The IC50 of the optimized method is 3.35 μg L−1 for feedstuff and 0.35 μg L−1 for environmental water. The recoveries ranged from 77.33 to 86.91 % (CV