Invitrogen™ LIVE/DEAD™ Fixable Near-IR Dead Cell Stain Kit, for 633 or 635 nm excitation

• Stable—dyes are freeze dried in separate vials to maintain stability
• Robust—staining pattern is the same before and after fixation
• Bright signal—allows for easy distinction between live/dead cells in single channel

Stable

The product is sold in tubes with DMSO and in lyophilized flow tubes and plates which require no DMSO. Amine reactive dyes in solution will lose their effectiveness over a short period of time, therefore it is recommended to completely use material once rehydrated.

Robust

Dead cell discriminator stains can lose sensitivity after treatment with fixatives such as formaldehyde or ethanol-based fixation methods required for intracellular phosphorylation studies. The LIVE/DEAD™ Fixable Near-IR Stain is an amine reactive dye that binds covalently to intracellular and extracellular amines, and the staining pattern is preserved following formaldehyde fixation.

Optimal brightness

The LIVE/DEAD™ Fixable Near-IR stain was selected based on its fluorescent properties to provide a bright signal when excited with a red laser. The near-IR fluorescent reactive dye has an excitation maximum of ∼633 nm making it ideal for use with the red or HeNe laser with an emission of ∼775 nm. Since live and dead cells can be discriminated using a single dye and a single channel of a flow cytometer, it is an ideal choice for multi-color experiments.

How it works

In cells with compromised membranes, the dye reacts with free amines both in the cell interior and on the cell surface, yielding intense fluorescent staining. In viable cells, the dye's reactivity is restricted to the cell-surface amines, resulting in less intense fluorescence. The difference in intensity is typically greater than 50-fold between live and dead cells, allowing for easy discrimination.

Colors available

LIVE/DEAD™ Fixable Dead Cell Stains are available in a wide variety of colors to meet your multi-color panel needs.