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Annexin V-FITC Early Apoptosis Detection Kit
Cellular Assay Kits
Assay Kit

Annexin V-FITC Early Apoptosis Detection Kit #6592

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F Image 1 - Annexin V-FITC Early Apoptosis Detection Kit

Flow cytometric analysis of Jurkat cells untreated (left) or treated with camptothecin (10uM, 4 hr; right) using Annexin V-FITC Early Apoptosis Detection Kit.

F Image 2 - Annexin V-FITC Early Apoptosis Detection Kit

Confocal immunofluorescent analysis of live Jurkat cells, untreated (left) or camptothecin-treated (right), using Annexin V-FITC Conjugate (green). Red = Propidium Iodide (fluorescent DNA dye). Blue pseudocolor = DRAQ5® #4084 (fluorescent DNA dye).

To Purchase # 6592S
Product # Size Price
1 Kit  (100 assays) N/A

Product Includes Quantity (with Count)
Annexin V-FITC Conjugate 1 x 100 µl
10X Annexin V Binding Buffer 2 x 1.5 ml
Propidium Iodide (PI) Solution 1 x 1.3 ml



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Protocol Id:

#6592 Annexin V-FITC Early Apoptosis Detection Kit Protocol

A. Solutions and Reagents

    Note: Prepare solutions with reverse osmosis deionized (RODI) or equivalent grade water.

  1. 20X Phosphate Buffered Saline (PBS) (#9808): To prepare 1L 1X PBS, add 50ml 20X PBS to 950ml dH20 and mix.
  2. 10X Annexin V Binding Buffer: To prepare 10mL 1X Annexin-V Binding Buffer, add 1ml 10X Binding Buffer to 9ml dH20 and mix. Keep on ice.

B. Test Procedure

  1. Collect cells of interest by centrifugation.
  2. Wash cells with ice-cold PBS or culture medium.
  3. Resuspend cells at 105 or 106 cells/ml with 1x Annexin V Binding Buffer. Aliquot 96µl of cell suspension in an assay tube.
  4. Add 1 µl Annexin V-FITC Conjugate and 12.5 µl Propidium Iodide (PI) Solution to each 96µl cell suspension. Allow cells to incubate 10 min on ice in the dark.
  5. Dilute the cell suspension to a final volume of 250 µl/ assay with ice-cold, 1X Annexin V Binding Buffer. Analyze immediately.

posted June 2020

Protocol Id: 2044

Product Description

The Annexin V-FITC Early Apoptosis Detection Kit enables researchers to identify early apoptotic cells within a cell population. Annexin V-FITC conjugated protein binds to cell surfaces expressing phosphatidylserine, an early apotosis marker. Cells stained with propidium iodide (PI), a non-cell-permeable DNA dye, indicate necrotic cells. Cells stained with both PI and annexin V-FITC demonstrate later stage apoptosis and early necrosis. This kit provides enough reagent to perform 100 assays, based on a 250 μl assay volume.


Annexin V belongs to the annexin family of proteins consisting of over 160 members. All annexin family members share the same charactersistic of Ca2+-dependent binding to negatively charged phospholipid surfaces (1). During early apoptosis, phosphatidylserine (PS) is translocated from the cytosolic side of the plasma membrane to the cellular surface. This translocation exposes PS to the extracellular environment with the plasma membrane left intact (2). Annexin V protein demonstrates high affinity, specificity, and sensitivity for PS and can be used as a marker of early apoptosis. In order to rule out "leaky" necrotic cells, annexin V must be used in tandem with reagents that determine the integrity of the cell membrane, such as propidium iodide (2).

  1. Boersma, H.H. et al. (2005) J Nucl Med 46, 2035-50.
  2. Vermes, I. et al. (1995) J Immunol Methods 184, 39-51.

Pathways & Proteins

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For Research Use Only. Not For Use In Diagnostic Procedures.

Cell Signaling Technology is a trademark of Cell Signaling Technology, Inc.
The Annexin V-FITC conjugate is a product manufactured for Cell Signaling Technology, Inc. by TAU Technologies BV.

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