Normal rabbit IgG is the standard isotype control for assay systems running rabbit-derived target primary antibodies. Used as a rabbit IgG isotype control, it matches the host species and immunoglobulin class of your test antibody without contributing specific antigen binding, isolating non-specific signal from true target detection.
A well-designed isotype control antibody runs at the same concentration as the rabbit IgG control it mirrors. Concentration matching is not a procedural formality. It is the only condition under which the control actually tells you something useful about your secondary antibodies’ binding behavior in the absence of a specific antigen. Rat IgG and rabbit IgG isotype controls serve parallel roles in their respective species systems but are not interchangeable in rabbit-primary assay designs.
Rabbit IgG isotype control preparations from Equitech-Bio are sourced from normal rabbit IgG pools to reflect the natural polyclonal distribution of rabbit immunoglobulins. In flow cytometry applications, the isotype control establishes the gating threshold that separates genuine surface marker staining from background fluorescence. In ELISA and western blotting, it confirms that your polyclonal antibody secondary detection step is reading target binding rather than matrix interference.
For other protein-protein interactions and non-specific binding assessment in complex matrices, protein-protein interaction controls require a matched control antibody at every concentration point. For downstream detection, goat IgG antibody and human IgG antibodies extend isotype control coverage across additional species. Research use only.
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