Design and synthesis of immunoconjugates and development of competition inhibition enzyme-linked immunosorbent assay (CIEIA) for the detection of O-isopropyl methylphosphonofluoridate (sarin): An organophosphorous toxicant

► Production of polyclonal antibodies against organophosphorous toxicant sarin (GB). ► The haptens used in the present studies have not been studied so far. ► Antibodies showed negligible cross reactivity (CR) with other OP toxicants. ► CIEIA to distinguish GB agent in the presence of other OP toxicants or pesticide. ► Polyclonal antibodies for the selective detection of sarin.