Аннотация:A new approach is proposed to obtain specific immunoreagents for detection of fluoroquinolones (FQs) that have a cyclopropyl radical in the 1st position of the quinolone core. The recommended immunogens should use coupling to a protein carrier via a carboxyl group in the 3rd position of the FQs, whereas solid-phase antigens for immunoassay should be obtained using the active groups of the radical in the 7th position. The given approach was applied to produce polyclonal antibodies against 3 FQs, danofloxacin (DAN), clinafloxacin (CLI), and moxifloxacin (MOX). The developed 15 enzyme immunoassays based on their use are characterized by detection limits of 0.5 ng/mL for DAN, 1.0 ng/mL for CLI, and 0.5 ng/mL for MOX. Interactions of the antibodies with 25 representatives of FQs were studied, and the possibility of using the obtained reagents for immunodetection of FQs with broad cross-reactivity was shown.