Polymer-based detection kits IHC - All tissues - Anti-Rabbit IgG - Alkaline phosphatase (AP)
Detection kits for immunohistochemistry (IHC) based on the polymers method are more recent than traditional kits using avidin and biotin conjugates such as ABC kits. Polymer-based kits offer several advantages over ABC kits, especially for multi-staining (multiplex) applications on the same tissue section or where high levels of endogenous biotin may be a problem.
The IHC detection systems based on the polymers method consist of a polymer of an active enzyme linked to a secondary antibody specific for a target primary antibody. This format makes it possible to significantly increase the amount of enzyme present at the site of localization and therefore a greater signal by converting a greater quantity of substrate into precipitate. Moreover, this system allows a one-step protocol instead of two with the ABC system (biotinylated antibody + avidin-enzyme complex).
The polymers may be based on dextran or similar molecules which have a large size (causing problems in some tissues) or micro-polymers that penetrate more easily into the tissue sections.
The Anti-Rabbit IgG polymer detection kits are designed to detect primary rabbit antibodies, it contains anti-rabbit IgG secondary antibodies linked to a polymer of alkaline phosphatase or HRP molecules.
The kits may or may not contain the blocking and dilution buffers and the substrate depending on the formats.
The most commonly used alkaline phosphatase substrates are Fast Red and Permanent Red. These 2 substrates form water-insoluble red precipitates when hydrolysed by alkaline phosphatase (AP). It is for this reason that they are commonly called chromogens. The localization of the target proteins is then carried out by microscopic visualization of the precipitates within the tissue.
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