The present disclosure provides organophosphorous (OP) compounds of Formula (I), Formula (II) and Formula (III):OP-Peptide-Linker-CP (I),OP-Peptide-Linker (II)； andwherein OP isincluding that structure corresponding to a reactive organophosphorous reagent, nerve agent or pesticide, or a pesticide P═S to P═O metabolite； P is the Sp or Rp stereoisomer； X is oxygen, sulfur, selenium or imino； R and R′ are as described； Peptide is a sequence of amino acids containing a serine, threonine or tyrosine to which the OP is attached, wherein the total number of amino acids is between 7 and 41； Linker is an amino acid or is derived from another bifunctional reagent capable of covalently attaching an OP-peptide to a CP； and CP is a carrier protein used to display haptens for antibody generation. The disclosure also provides methods for generating monoclonal or polyclonal antibodies specific for an OP-Peptide of a compound of Formula (I) or Formula (II) that can be used to diagnose the presence, identity, and quantity of OP adducts.
