Overview
Rabbit polyclonal antibodies (pAbs) are immunological reagents generated by immunizing rabbits with target antigens. Unlike monoclonal antibodies, pAbs recognize multiple epitopes on an antigen, enhancing detection sensitivity in complex samples. They are produced through a multi-step process involving animal immunization, serum collection, and purification (e.g., protein A/G affinity chromatography). Due to their broad epitope coverage, rabbit pAbs are less prone to antigen-binding failure caused by minor structural changes. However, batch-to-batch variability is a consideration. They dominate applications requiring high signal amplification, such as detecting low-abundance proteins in research or clinical diagnostics.
Physical and Chemical Properties
Rabbit pAbs are typically IgG-class immunoglobulins with a molecular weight of ~150 kDa. They consist of two heavy and two light chains linked by disulfide bonds. The purified form appears as a clear liquid, though serum-derived preparations may be slightly opalescent due to lipoprotein content. These antibodies are stable in neutral buffers (e.g., PBS, pH 7.4) but degrade under repeated freeze-thaw cycles. Additives like glycerol (10–50%) or BSA (1–5%) are often included to stabilize formulations. Their solubility depends on the buffer ionic strength; precipitation may occur in high-salt conditions.
Main Applications
In research, rabbit pAbs are workhorses for Western blotting, immunohistochemistry (IHC), and immunofluorescence (IF), where their multi-epitope binding improves target detection. They are also used in ELISA kits for diagnostic markers (e.g., infectious diseases, cancer biomarkers). Therapeutics leverage pAbs for passive immunization, such as rabies or snake antivenom. Emerging applications include conjugated pAbs for imaging (e.g., near-infrared dyes) and drug delivery systems. Their versatility makes them indispensable in proteomics and signal transduction studies.
Safety and Storage
Rabbit pAbs may contain endotoxins or residual pathogens from serum. Use gloves and lab coats when handling. For in vivo applications, ensure endotoxin levels are <1 EU/mg (tested by LAL assay). Store lyophilized pAbs at -20°C; reconstituted aliquots should avoid repeated freezing/thawing. Liquid formulations often include sodium azide (0.02–0.05%) as a preservative—discard if turbidity or precipitation occurs. Always centrifuge briefly before use to remove aggregates.
B2B Procurement Guide
When sourcing rabbit pAbs, prioritize suppliers providing detailed CoA (Certificate of Analysis) with specificity validation (e.g., knockout-validated for research use). Key metrics include titer (by ELISA), cross-reactivity data, and purity (SDS-PAGE ≥90%). For bulk orders, request pilot batches to test performance in your specific assay. Consider customized services (e.g., pre-adsorption to remove non-target reactivity). Lead times vary: off-the-shelf pAbs ship in 1–2 weeks, while custom productions take 3–6 months. Negotiate volume discounts for recurring purchases.
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