Rat IgG is the primary immunoglobulin class in rat serum, carrying the structural framework of immunoglobulin G across heavy and light chains that define antigen binding geometry and Fc fragment effector interactions. In research systems where the primary antibody is rat-derived, every downstream detection step depends on reagents raised and purified against rat IgG H L specifically.
Goat anti-rat IgG is the standard secondary pairing for rat-primary detection, binding rat IgG H L across the intact molecule, with specificity that pre-adsorption against cross-reactive species reinforces. Anti-rat IgG H-chain-specific formats offer more targeted specificity for applications where light-chain cross-reactivity would introduce background in a multiplex system. Mouse IgG antibody and rat IgG occupy distinct structural niches within rodent immunology, and the same species logic that governs isotype control selection applies equally to secondary antibody pairing.
Equitech-Bio’s rat serum-derived anti-rat IgG antibody preparations are purified by agarose beads-based affinity methods to remove non-immunoglobulin serum proteins and deliver a clean immunoglobulin fraction. In early brain injury and neuronal apoptosis research, rat-derived primary antibodies targeting neural markers are routinely detected using horseradish peroxidase-conjugated goat anti-rat IgG secondaries. Anti-goat serum cross-adsorption steps prevent interference when goat-derived reagents are present elsewhere in the same protocol.
For parallel rabbit-target detection in the same workflow, rabbit IgG antibody products provide species-matched coverage without cross-reactivity with rat IgG binding channels. Research use only.
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