How to find the right Lab Antibodies AI guide
Written by an AI model from its trained knowledge.
What the AI looks for in Lab Antibodies
- Application-specific validation
- Buy only if the datasheet shows data for your exact application (western blot, IHC-P, IHC-F, flow, IP, IF, ChIP) in your sample type An antibody that works in western blot (denatured protein) often fails in IHC or flow (native protein), and the reverse.
- Species reactivity and host
- Reactivity must list your sample species; the host species must differ from the sample species, or you need a mouse-on-mouse style blocking protocol A secondary antibody cannot tell a same-species primary apart from endogenous immunoglobulin, which gives high background.
- Clonality
- Prefer recombinant or monoclonal for reproducibility; use polyclonal for signal amplification or for detecting denatured or low-abundance targets Polyclonals vary from lot to lot. Recombinant monoclonals are defined by sequence and stay consistent.
- Format and conjugate
- Match the fluorophore or enzyme conjugate to your instrument's lasers and filters or to your detection chemistry; buy carrier-free (no BSA or azide) if you plan to conjugate it yourself BSA and sodium azide interfere with labeling chemistry, and azide inhibits HRP.
- Traceability
- The catalog number, clone name, lot and an RRID should be identifiable These let you reorder the same reagent and report it correctly in publications.
- Cold chain
- Must ship on ice packs or dry ice as the datasheet specifies; store aliquoted at the stated temperature Heat exposure and repeated freeze-thaw cycles cause aggregation and loss of binding.
Brands that matter
- Cell Signaling Technology: Strong application-specific validation, especially for signaling and phospho-specific antibodies.
- Abcam: Very large catalog with many recombinant rabbit monoclonals.
- Thermo Fisher Scientific (Invitrogen): Broad catalog of primaries, secondaries and conjugates.
- BioLegend: Go-to source for flow cytometry conjugates, especially immunology markers.
- R&D Systems (Bio-Techne): Strong in cytokines, receptors and matched ELISA antibody pairs.
- Proteintech: Broad polyclonal and recombinant catalog that publishes knockout-based validation data.
- Jackson ImmunoResearch: Widely used for secondary antibodies, including cross-adsorbed versions.
- Santa Cruz Biotechnology: Huge catalog; check validation for each product carefully.
What to avoid
- Antibodies with no validation data for your application or species
- A primary raised in the same species as your tissue unless you add a dedicated blocking step
- Non-cross-adsorbed secondaries for multiplex staining
- Third-party listings that cannot confirm cold-chain shipping or the original lot
- Repeated freeze-thaw cycles of an unaliquoted vial
Questions
Monoclonal, recombinant or polyclonal?
Recombinant monoclonals give the best lot-to-lot reproducibility. Polyclonals recognize several epitopes, so they can be more sensitive but vary more between lots.
Why does my western-validated antibody fail in IHC?
Western blot detects denatured epitopes, while IHC and flow detect native or fixed ones. Validation does not transfer between applications.