PE Annexin V

Pricing & Availability
Regulatory Status
Other Names
Annexin A5
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Product Citations
Human T leukemia cell line Jurkat, treated (left) or non-treated (right) with BioLegend’s anti-human CD95 (EOS9.1) mAb (Cat. No. 305704) for 4 hours at 37°C, then stained with Annexin V- PE for 15 minutes at 37°C in Annexin V Binding buffer. Helix NP Green (Cat. No. 425303 at 1.25 nM) added 5 minutes at room temperature prior to running tubes.
  • PE_Annexin-V_kit_082412
    Human T leukemia cell line Jurkat, treated (left) or non-treated (right) with BioLegend’s anti-human CD95 (EOS9.1) mAb (Cat. No. 305704) for 4 hours at 37°C, then stained with Annexin V- PE for 15 minutes at 37°C in Annexin V Binding buffer. Helix NP Green (Cat. No. 425303 at 1.25 nM) added 5 minutes at room temperature prior to running tubes.
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640907 25 tests $98
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640908 100 tests $226
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640947 300 tests $445
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Annexin V (or Annexin A5) is a member of the annexin family of intracellular proteins that binds to phosphatidylserine (PS) in a calcium-dependent manner. PS is normally only found on the intracellular leaflet of the plasma membrane in healthy cells, but during early apoptosis, membrane asymmetry is lost and PS translocates to the external leaflet. Fluorochrome-labeled Annexin V can then be used to specifically target and identify apoptotic cells. Annexin V Binding Buffer (Cat. # 422201) is recommended for use with Annexin V staining. Annexin V binding alone cannot differentiate between apoptotic cells and necrotic. Therefore, we recommend using our Helix NP™ Blue (Cat. No. 425305), Helix NP™ Green (Cat. No. 425303) or Helix NP™ NIR (Cat. No. 425301). Early apoptotic cells will exclude 7-AAD and PI, while late stage apoptotic cells and necrotic cells will stain positively, due to the passage of these dyes into the nucleus where they bind to DNA.

Product Details
Technical data sheet

Product Details

Verified Reactivity
Human, Mouse, Rat
Reported Reactivity
Other Species
Phosphate-buffered solution, pH 7.2, containing 0.09% sodium azide and BSA (origin USA)
The purified protein was conjugated with PE under optimal conditions.
Lot-specific (to obtain lot-specific concentration and expiration, please enter the lot number in our Certificate of Analysis online tool.)
Storage & Handling
The Annexin V solution should be stored undiluted between 2°C and 8°C, and protected from prolonged exposure to light. Do not freeze.

FC - Quality tested

Recommended Usage

Each lot of this product is quality control tested by immunofluorescent staining with flow cytometric analysis. For flow cytometric staining, the suggested use of this reagent is 5 µl per 100,000 - million cells in a 100 µl volume of Annexin V Binding Buffer (Cat No. 422201). It is recommended that the reagent be titrated for optimal performance for each application.

Excitation Laser
Blue Laser (488 nm)
Green Laser (532 nm)/Yellow-Green Laser (561 nm)
Application Notes

Annexin V Staining
1. Wash cells twice with cold BioLegend Cell Staining Buffer (Cat. No. 420201) and then resuspend cells in Annexin V Binding Buffer (Cat. No. 422201) at a concentration of 1x106 cells/mL.
2. Transfer 100 µL of cell suspension in 5 mL test tube.
3. Add 5 µL of PE Annexin V.
4. Add 10 µL of PI solution (Cat. No. 421301) or 7-AAD (Cat. No. 420403/420404).
5. Gently vortex the cells, and incubate for 15 min at room temperature (25°C), in the dark.
6. Add 400 µL of Annexin V Binding Buffer (Cat. No. 422201) to each tube. Analyze by flow cytometry.

For a better experience detecting apoptosis, we now recommend Apotracker™. Cell staining with Apotracker™ is Calcium independent. Thus, no special buffers are required, and the protocol can be shortened for single-step co-staining with other reagents.

Application References

(PubMed link indicates BioLegend citation)
  1. Koopman G, et al. 1994. Blood 84:1415.
  2. Vermes I, et al. 1995. J. Immunol. Methods 184:39.
  3. Dachary-Prigent J, et al. 1993. Blood 81:2554.
  4. Sekine C, et al. 2009. Int Immunol. PubMed
  5. Grujic M, et al. 2010. J. Immunol. 185:1730. PubMed
Product Citations
  1. Roblek M, et al. 2022. Front Oncol. 12:777634. PubMed
  2. Desikan SA, et al. 2022. STAR Protoc. 3:101388. PubMed
  3. Chiu Y, et al. 2017. Nat Commun. 8:14324. PubMed
  4. Symeonidou V, et al. 2021. Cell Rep. 37:109900. PubMed
  5. Kulkarni PP, et al. 2021. Haematologica. . PubMed
  6. Carriere PP, et al. 2018. Int J Oncol. 53:1442. PubMed
  7. Liu Y, et al. 2022. Cancer Discov. :. PubMed
  8. Hinterbrandner M, et al. 2021. JCI Insight. 6:e151797. PubMed
  9. Bartleson JM, et al. 2020. Nat Immunol. 1384:21. PubMed
  10. Liu J, et al. 2021. Sci Adv. 7: . PubMed
  11. Herman KD, et al. 2022. Front Immunol. 13:956991. PubMed
  12. Fuhrmann F et al. 2016. eLife. 5 pii: e20616. PubMed
  13. Blümel E, et al. 2020. Oncoimmunology. 9:1751561. PubMed
  14. MacDonald A, et al. 2021. Front Immunol. 12:755995. PubMed
  15. Lei L, et al. 2021. J Cell Mol Med. . PubMed
  16. Paterson N, et al. 2022. Elife. 11:. PubMed
  17. Grinnemo KH, et al. 2019. Stem Cell Res Ther. 0.674305556. PubMed
  18. Blümel E, et al. 2019. Oncoimmunology. 8:e1641387. PubMed
  19. Krauss PL, et al. 2021. Front Immunol. 12:730672. PubMed
  20. Sun H, et al. 2017. J Autoimmun. 10.1016/j.jaut.2017.08.004. PubMed
  21. Malouf C, et al. 2021. Blood. 138:2066. PubMed
  22. Jakic B, et al. 2021. Cell Death Dis. 12:187. PubMed
  23. Verma N, et al. 2020. Sci Adv. 6:00. PubMed
  24. Hills LB, et al. 2021. J Immunol. 206:89. PubMed
  25. Ryan P, et al. 2016. Proc Natl Acad Sci U S A. 113(50):14378-14383. PubMed
  26. Olson WJ, et al. 2019. Cell Rep. 28:2878. PubMed
  27. Roy AG, et al. 2021. Int J Mol Sci. 22:. PubMed
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  29. Zhang X, et al. 2021. Front Pharmacol. 12:629513. PubMed
  30. Kamali K, et al. 2021. Front Immunol. 12:647900. PubMed
  31. Jeong S, et al. 2021. Cell Metab. 33:145. PubMed
  32. Lei L, et al. 2021. Front Cell Dev Biol. 659744:9. PubMed
  33. Mesnieres M, et al. 2021. Cell Reports. 36(8):109618. PubMed
  34. Stevens M, et al. 2016. Nat Biotechnol. 34:1161-1167. PubMed
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not an antibody (BioLegend Cat. No. 640907)
AB_2561298 (BioLegend Cat. No. 640908)
not an antibody (BioLegend Cat. No. 640947)

Antigen Details

Biology Area
Apoptosis/Tumor Suppressors/Cell Death, Cell Biology, Neuroscience
Gene ID
308 View all products for this Gene ID
View information about Annexin V on

Related FAQs

How is your Annexin made and what sequence does it cover?

It is made in E. coli, covering human aa Met1-Asp320.

How does pH and staining temperature affect Annexin V-Phosphatidylserine binding?

Annexin-Phosphatidylserine binding is lost below pH 5.2 and with prolonged incubation over a temperature of 42°C.

What type of PE do you use in your conjugates?
We use R-PE in our conjugates.
Why do I need to use Annexin V Binding Buffer?

Annexin V binding requires the presence of calcium in the solution.  So, we provide Annexin V Binding Buffer (cat # 422201), which is optimized for the best performance of Annexin V staining.

Can I use RPMI during Annexin V staining?

It is best to follow protocol as described on the product data sheet. Moreover, RPMI 1640 has a relatively high concentration of phosphate and low calcium ion concentration, which negatively impacts Annexin binding to its target phosphatidylserine (PS). Measurement of cell death by using Annexin V may also be significantly affected by time of incubation on ice, calcium concentration, and type of medium.

Can I freeze Annexin V conjugates?

It should not be frozen as it will lead to loss of biological activity due to dimerization.

Is Annexin V suitable for conjugation with the Maxpar® kit for CyTOF®?

Maxpar® Labeling kits require the protein to be partially reduced, so the metal chelate can be introduced through an SH group in the hinge region of the reduced antibody. Human Annexin V contains only one Cysteine which was reported to be chemically inactive. Thus, the Maxpar® labeling protocol would not work with Annexin V, unless a free –SH group can be introduced to Annexin V.  For more information regarding SH-mediated conjugation of Annexin V please consult published papers such as this one.

Go To Top Version: 7    Revision Date: 11/01/2023

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This data display is provided for general comparisons between formats.
Your actual data may vary due to variations in samples, target cells, instruments and their settings, staining conditions, and other factors.
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