AtaGenix Laboratories
AtaGenix Laboratories
Release time: 2026-03-23 View volume: 2
An antibody is only as useful as the applications it has been validated for. This guide explains the five most common validation assays — WB, IHC, IF, ELISA, and FC — what each one tests, when each is necessary, and how to design a practical validation strategy for your research antibody.
Using an antibody in an application it hasn’t been validated for is one of the most common causes of irreproducible results. Each assay places different demands on the antibody: WB requires recognition of denatured linear epitopes, while IF and FC require binding to native conformation. An antibody that works perfectly in WB may fail completely in IF, and vice versa. Proper validation before use saves time, reagents, and data integrity.
| Assay | Full Name | What It Tests | Epitope State | Key Output |
|---|---|---|---|---|
| WB | Western Blot | Specificity & molecular weight | Denatured (linear) | Single band at expected MW |
| IHC | Immunohistochemistry | Tissue localization & expression pattern | Fixed (partially denatured) | Specific staining pattern in tissue |
| IF | Immunofluorescence | Subcellular localization | Fixed or native | Fluorescence signal at expected compartment |
| ELISA | Enzyme-Linked Immunosorbent Assay | Binding affinity & quantification | Coated (may be native or denatured) | Titer, EC50, quantitative readout |
| FC | Flow Cytometry | Cell-surface or intracellular expression | Native (surface) or fixed (intracellular) | % positive cells, MFI shift |
Validate for every application you plan to use. At minimum, most research antibodies should be tested in WB (specificity baseline) plus the application(s) required for your experiments. If you plan to use the antibody in IHC, validate in IHC — WB validation alone does not guarantee IHC performance, because the epitope conformation differs between denatured and fixed states.
Wrong epitope state: Antibody raised against native protein fails in WB (denatured), or vice versa.
Cross-reactivity: Antibody binds homologous proteins or non-specific targets. Use knockout/knockdown controls to confirm specificity.
Species mismatch: Antibody validated in human samples may not cross-react with mouse ortholog (or vice versa). Always check species reactivity.
Fixation artifacts: Over-fixation in IHC/IF can mask epitopes. Antigen retrieval conditions must be optimized per antibody.
Need multi-application validated antibodies? AtaGenix provides custom antibody development with WB, IHC, IF, ELISA, and FC validation as standard or add-on services.
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