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CF®488A Annexin V and PI Apoptosis Kit

This kit contains CF488A-Annexin V to stain apoptotic cells and PI to stain necrotic cells.

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Apoptosis/viability marker

Phosphatidylserine/Annexin V, Dead cell stain, Apoptosis/necrosis assay

For live or fixed cells

For live/intact cells

Assay type/options

Endpoint assay

Detection method/readout

Fluorescence microscopy, Flow cytometry



Catalog #
100 assays
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Product Description

Phosphatidylserine (PS) is translocated from the inner to the outer surface of the cell for phagocytic cell recognition. The human anticoagulant, Annexin V, is a 35 kDa Ca2 -dependent phospholipid protein with a high affinity for PS. Annexin V labeled with CF®488A (Abs/Em= 490/515 nm) can identify apoptotic cells in green by binding to PS exposed on the outer leaflet. Our CF®488A dye is superior to fluorescein/FITC as it is not affected by pH and has much better photostability. Propidium iodide (PI) is impermeant to live cells or early apoptotic cells, but stains necrotic cells and late apoptotic cells with red fluorescence (Abs/Em with DNA = 535/617 nm). Both PI and Annexin V-CF®488A can be excited using the 488nm line of a flow cytometer.


1. Cell Death and Disease (2014), doi:10.1038/cddis.2013.550

2. Autophagy (2016), doi: 10.1080/15548627.2016.1147667

3. J Young Pharm. (2016), doi: 10.5530/jyp.2016.3.4

4. Molecular Medicine Reports (2017), doi: 10.3892/mmr.2017.6480


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Support & Faq

Apoptosis, Necrosis, and Cell Viability Kits

Fixation is not recommended after staining with the Viability/Cytotoxicity Assay Kit (cat. # 30027) as the dead cell dye, EthD-III will transfer to all cells and not maintain dead cell-specific staining.

Viability qPCR (vPCR) can be an alternative strategy. Using dead cell-specific dyes, PMA (cat. # 40019) or PMAxx (cat. # 40069) that covalently modify DNA (of only dead cells) after photo-crosslinking, a simple quantitative PCR (qPCR) amplification is used to selectively amplify live-cell DNA. Learn more about the vPCR technology.

Category: Apoptosis, Necrosis, and Cell Viability Kits

← FAQs

The ViaFluor® SE dyes are susceptible to hydrolysis. Ideally the DMSO stock solution should be prepared on the day of use, with the intent that each vial supplied is for single use. If smaller aliquots are desired, it would be best to aliquot the initial DMSO stock, at the time of reconstitution, into single use quantities and store at -20C, protected from light and moisture (desiccated), for up to a month. However, activity may be reduced over time. The dyes should only be added to aqueous buffer immediately before staining. The aqueous solution cannot be stored for reuse.

Category: Apoptosis, Necrosis, and Cell Viability Kits

← FAQs

MTT and XTT are colorimetric based assays, while resazurin can be measured using colorimetric or fluorescence detection. MTT is not a soluble product, so the cells must be lysed to solubilize the formazan salt before absorbance can be measured. XTT and resazurin do not require cell lysis, allowing kinetic monitoring of the same samples at different timepoints.

Category: Apoptosis, Necrosis, and Cell Viability Kits

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