HRP-conjugated anti-pig primary antibodies are immunoglobulins that directly bind a porcine antigen and carry a covalently attached horseradish peroxidase enzyme. HRP catalyzes the oxidation of substrates such as TMB or DAB in the presence of hydrogen peroxide, producing a chromogenic or chemiluminescent signal proportional to the amount of target antigen. Conjugation is typically achieved by the periodate method, which oxidizes carbohydrate residues on the HRP molecule to reactive aldehydes that couple to amine groups on the immunoglobulin; the resulting conjugates are characterized by an enzyme-to-protein molar ratio, commonly around 4.0 for anti-pig IgG (Fc)-HRP preparations. Direct HRP labeling eliminates the secondary antibody incubation step, reducing assay time and avoiding cross-reactivity from anti-pig secondary reagents, which is particularly advantageous when working with porcine tissues that contain endogenous immunoglobulins.

Applications

HRP-conjugated anti-pig reagents are validated across several immunoassay platforms. ELISA is a major application, with recommended working dilutions typically ranging from 1:1,000 to 1:10,000 for anti-pig IgG (Fc)-HRP and 1:4,000 to 1:8,000 for anti-pig IgG (H+L)-HRP. Western blotting employs dilutions of approximately 1:1,000 to 1:50,000 depending on the conjugate and target. Immunohistochemistry on frozen and formalin-fixed, paraffin-embedded porcine tissues is performed at dilutions of roughly 1:100 to 1:1,000. HRP-conjugated anti-pig transferrin has been used for enzyme-immunocytochemical and immunohistochemical detection of transferrin at the cellular and subcellular level, as well as in ELISA and Western blotting. HRP-conjugated anti-pig myostatin is validated for immunocytochemistry, Western blotting, and immunoprecipitation. For anti-pig immunoglobulin reagents, applications also include dot blot, immunomicroscopy, and fluorescence-based plate assays.