A cytometric bead array uses populations of fluorescent beads as the solid phase instead of a microplate well. Each bead population carries a specific capture antibody. You incubate multiple bead populations together in a single tube with sample and detection antibodies, then read the result on a flow cytometer. This lets you measure more than 5 analytes at once from one small-volume reaction, instead of using separate ELISA wells.
Antibody & Protein Arrays
Cytometric Bead Arrays for solution-based high throughput protein detection
Cytometric bead arrays for multiplex cytokine quantification on your existing flow cytometer
Bead-based arrays couple capture antibodies to beads with a defined size and fluorochrome combination, so you get multiplex protein measurement without buying extra instruments. Each bead type carries a single capture antibody. You incubate your sample with the bead mixture, then add biotinylated detection antibodies. A PE-conjugated streptavidin reporter then generates a signal proportional to the captured protein. The bead identity tells you which analyte you are measuring, and you quantify each one against a standard curve.
Cytometric bead arrays work with most standard flow cytometers. You do not need a dedicated instrument, and a run takes about four hours. Premade panels are available for human, mouse, and rat samples. You can also build customised arrays from a large library of validated antibody pairs. These cover cytokines, chemokines, growth factors, and signalling proteins.
Magnetic bead variants use magnetic beads for automated washing with a magnetic separator. This reduces hands-on time and lets you integrate the assay with liquid handling systems.
When to Use Cytometric Bead Arrays
- If you already run flow cytometry and want to add protein quantification without buying an extra instrument, use cytometric bead arrays. They run on your existing flow cytometer.
- If you need to measure more than 5 cytokines or proteins at once from a small sample volume, choose the multiplexed bead format. It needs a single tube incubation rather than separate ELISA wells for each analyte.
- If reagent cost per data point matters, compare bead arrays to running individual ELISAs for each target. Bead array formats are far more efficient when you measure multiple analytes from the same sample.
- If you need a custom panel for specific proteins not in a premade kit, use custom assembly. It draws from a large validated antibody pair library that covers most common targets for human, mouse, and rat.
- If you process many samples in a high-throughput setting and need automated washing, choose magnetic bead kits. They work with magnetic separators and automated liquid handlers.
- If you need the highest sensitivity for low-abundance cytokines below standard bead array detection limits, consider glass-slide antibody arrays instead. They use a semi-quantitative fluorescence readout, with similar multiplexing and potentially higher sensitivity for demanding samples.
Applications
Existing-instrument integration
Cytometric bead arrays add multiplexed protein quantification to a flow cytometer already in your lab, without a dedicated instrument purchase.
T-helper subset profiling
Bead arrays quantify T-helper subset-defining cytokines together, including IFN-gamma, IL-4, IL-17A, and IL-10, from a single 25-microlitre sample.
Immuno-oncology profiling
Bead arrays profile cytokine responses to checkpoint inhibition and CAR-T activation, complementing potency readouts from cell-based functional assays.
Translational biomarker studies
Multi-analyte serum biomarker profiling in clinical cohorts benefits from bead array throughput, with quantitative antibody arrays for larger panels.
Sepsis research
IL-6, IL-8, IL-10, and TNF-alpha quantification from one sample suits time-sensitive panels, with glass-slide antibody arrays for low-abundance targets.
Allergy and asthma research
IL-5, IL-13, and eotaxin panels support Th2-driven allergic and asthma models from limited sample volumes.
Product Catalog
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Cytometric Bead Arrays
Multiplex Cytokine Quantification on Your Existing Flow Cytometer
Frequently asked questions
Compatibility requires a flow cytometer equipped with blue and red lasers, capable of detecting fluorescence in the PE and APC channels. Check the assay's bead classification scheme against your instrument's laser and filter configuration. Some systems use bead size differences. Others use gradient fluorescence intensity coding.
Sensitivity varies by analyte and kit. Cytometric bead arrays typically achieve limits of detection between 1 and 10 pg/ml for cytokines. This is comparable to many sandwich ELISA kits. For very low-abundance targets, glass-slide antibody arrays, which give a semi-quantitative fluorescence readout, may offer higher sensitivity. Bead arrays make up for this with multiplexing efficiency when you measure many analytes from a limited sample.
Yes. Most cytometric bead array platforms offer a library of individual bead populations, each pre-coupled to a specific capture antibody. To build a custom panel, combine the single-plex bead populations you need into one tube. The panel size depends on two things. It depends on how many bead populations your instrument can resolve, and how many validated capture antibodies exist for your target species.
Parent category: Protein arrays
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