Human IL-21 ELISA Kit (Colorimetric)


ELISA: IL-21 ELISA Kit [NBP1-84816] - Standard curve

Product Details

Reactivity HuSpecies Glossary
Applications ELISA
Suitable Sample Type
Cell culture supernatant, serum, plasma (EDTA, citrate), buffered solution
Standard Curve Range
78 - 5,000 pg/mL
20.0 pg/mL

Order Details

Human IL-21 ELISA Kit (Colorimetric) Summary

The assay detects both natural and recombinant human IL-21. The interference of circulating factors of the immune system was evaluated by spiking these proteins at physiologically relevant concentrations into serum. There was no crossreactivity detected.
Standard Curve Range
78 - 5,000 pg/mL
20.0 pg/mL
Assay Type
Sandwich ELISA
CV% < 7.7%
CV% < 5.8%
Spike Recovery
The mean recovery for sera was 71%, for plasma (EDTA) 42%, for plasma (citrate) 58% and for cell culture supernatant 95%.
Sample Volume
50 uL
Kit Type
ELISA Kit (Colorimetric)


Application Notes
This kit is an enzyme-linked immunosorbent assay for quantitative detection.

Packaging, Storage & Formulations

Storage of components varies. See protocol for specific instructions.

Kit Components

  1. Wash Buffer Concentrate 20x (PBS with 1% Tween 20)
  2. Substrate Solution (tetramethyl-benzidine)
  3. Streptavidin-HRP
  4. Stop Solution (1M Phosphoric acid)
  5. Sample Diluent
  6. Human IL-21 Standard lyophilized, 10 ng/mL upon reconstitution
  7. Biotin-Conjugate anti-human IL-21 monoclonal antibody
  8. Assay Buffer Concentrate 20x (PBS with 1% Tween 20 and 10% BSA)
  9. Adhesive Films
  10. Aluminium pouch(es) with a Microwell Plate coated with monoclonal antibody to human IL-21

Alternate Names for Human IL-21 ELISA Kit (Colorimetric)

  • CVID11
  • IL21
  • IL-21
  • IL-21Za11interleukin-21
  • interleukin 21
  • interleukin-21 isoform
  • Za11


The human IL-21 ELISA is an enzyme-linked immunosorbent assay for the quantitative detection of human IL-21. Interleukin-21 is a member of the type-I cytokine family. Structurally, IL-21 shows homology to IL-2, IL-4, and IL-15 proteins. IL-21 shares the common gamma-chain with these three cytokines, but, in addition, binds to a unique IL-21R alpha chain, and activates the JAK/STAT pathway. IL-21 has pleiotropic actions, from augmenting the proliferation of T cells and driving the differentiation of B cells into memory cells and terminally differentiated plasma cells to augmenting the activity of natural killer cells. IL-21 is mainly produced by activated T-cells, but targets a broad range of lymphoid and myeloid cells of the immune system and therefore is able to regulate innate and acquired immune responses. IL-21 has pathologic function in immune-inflammatory diseases. Data suggest the existence of a positive autocrine loop that could help to amplify and stabilize IL-21-driven, T cell-mediated responses. Moreover, it has antitumour activity and may have a role in the development of autoimmunity. IL-21 may have therapeutic potentials as an antitumor agent in the clinic.


This product is for research use only and is not approved for use in humans or in clinical diagnosis. ELISA Kits are guaranteed for 6 months from date of receipt.

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Gene Symbol IL21