Antibody pairs, consisting of carefully selected and matched capture and detection antibodies, are vital components in ELISA kits and other sandwich-based immunoassays. These pairs are designed to ensure high specificity and sensitivity for the target antigen, providing researchers with reliable tools for quantifying proteins. At Abcam, we have developed over 1800 antibody pairs using our recombinant rabbit monoclonal antibodies to ensure optimized specificity, sensitivity, and reproducibility.

By ELISA format

Selecting the right ELISA format is an important first step when building a custom assay. Antibody pairs are most commonly used in sandwich ELISA workflows but can also support other formats depending on the target and assay design.

Sandwich ELISA (most common)

Matched antibody pairs are specifically designed for sandwich ELISA assays, where a capture antibody binds the target antigen and a detection antibody enables sensitive quantification. This format is ideal for larger proteins with multiple epitopes and delivers high specificity and sensitivity.

Competitive ELISA

For small molecules or targets with limited epitopes, competitive ELISA formats may be required. While antibody pairs are less commonly used in this format, they can support assay development workflows where flexibility in detection strategy is needed.

Custom ELISA development

Antibody pairs provide the flexibility to design and optimize your own ELISA assays, including selection of detection labels, substrates, and readout systems. This makes them a powerful option for researchers developing assays for novel or less characterized targets.

Key features

We use monoclonal antibodies for the best sensitivity: monoclonal antibodies bind to one specific epitope on the target antigen, reducing cross-reactivity and background noise, offering improved signal quality and sensitivity.

^{Fig. 1 A rabbit monoclonal antibody pair for Human IL-1Ra allows a significant gain in sensitivity compared to a rabbit polyclonal pair to the same target.}

^{Fig 2. Lot-to-lot comparison of polyclonal versus monoclonal antibody-based ELISA detection.
Left panel: Rabbit polyclonal detector shows significant variability between lots when measuring fibrinogen (ng/mL), with signal-to-noise ratios differing across concentrations.
Right panel: Rabbit monoclonal antibody pair demonstrates consistent performance between lots when detecting mouse IL-33 (pg/mL), as indicated by overlapping O.D. (450 nm) curves.}

Our pairs are provided as individual capture and detector antibodies, unconjugated and in a carrier-free format (free from BSA and Azide). This means they are ready for conjugation, as there will be no interference from proteins or stabilizers with the conjugation site, and you can select your label of choice.

Designed for assay development

Our antibody pairs are developed to support flexible, high-performance assay design across a wide range of research applications.

Optimized pairing for performance

Each capture and detection antibody pair is carefully selected and validated to work together, reducing the need for extensive screening and optimization.

Carrier-free format for flexibility

Supplied without stabilizers such as BSA or azide, these antibodies are ready for conjugation, allowing you to choose the detection chemistry that best fits your workflow.

Scalable from research to validation

Antibody pairs are suitable for early-stage research through to assay validation, supporting applications from biomarker discovery to translational research.

Compatible with multiple detection systems

Use with colorimetric, chemiluminescent, or fluorescent detection methods depending on your sensitivity and instrumentation requirements.

Key benefits of carrier-free recombinant monoclonal antibody pairs

Streamlined workflow

Using pre-validated antibody pairs reduces the time and effort required to develop and optimize ELISA assays and other sandwich-based immunoassays.

Enhanced sensitivity and reproducibility

Consistent pair performance leads to reliable experimental outcomes.

Versatility

Suitable for a wide array of applications, from basic research to specific disease biomarker detection.

Using our recombinant monoclonal antibody pairs in your ELISA/immunoassays workflows not only simplifies the experimental setup but also enhances the reliability and accuracy of your results, empowering your research with precision.