Shop All Cell Viability Kits

CellROX™ Deep Red Flow Cytometry Assay Kit (Invitrogen™)

The CellROX™ Deep Red Flow Cytometry Assay Kit enables the flow cytometric detection of reactive oxygen species (ROS) in live cells. The kit includes the novel, fluorogenic CellROX™ Deep Red Reagent, as well as SYTOX™ Blue dead cell stain, N-acetyl cysteine (an antioxidant, for negative control), and tert-butyl hydroperoxide solution (TBHP, an inducer of ROS).

View a selection guide for all CellROX® Reagents and Kits.

The CellROX™ Deep Red Flow Cytometry Assay Kit features:

• Fluorogenic probe formulated for flow cytometry that is oxidized in the presence of ROS
• Multicolor compatibility—minimal overlap with fluorophores excited by other laser lines, allowing easy multiplexing with other reagents
• Simple protocol—cells can be stained in complete media or other appropriate buffer, no need for serum free media

The CellROX™ Deep Red Detection Reagent is cell-permeable and non-fluorescent or very weakly fluorescent while in the reduced state. Upon oxidation, the reagent exhibits a strong fluorogenic signal that has absorption/emission maxima of 644/665 nm and remains localized in the cytoplasm. When used together with the included SYTOX™ Blue Dead Cell Stain, oxidatively stressed and non-stressed cells are reliably distinguished from dead cells by flow cytometry.

LIVE/DEAD™ Viability/Cytotoxicity Kit, for mammalian cells (Invitrogen™)

The LIVE/DEAD® Viability/Cytotoxicity Kit is a quick and easy two-color assay to determine viability of cells in a population based on plasma membrane integrity and esterase activity. The kit can be used in flow cytometry, fluorescence microscopy, and with fluorescence microplate readers.

Advantages Over Alternative Methods Include:


•  Faster
•  Safer
•  More sensitive
•  Less expensive

Easily Use with a Wide Variety of Techniques and Cell Types
Ubiquitous intracellular esterase activity and an intact plasma membrane are distinguishing characteristics of live cells. The LIVE/DEAD® Viability/Cytotoxicity Kit quickly discriminates live from dead cells by simultaneously staining with green-fluorescent calcein-AM to indicate intracellular esterase activity and red-fluorescent ethidium homodimer-1 to indicate loss of plasma membrane integrity. It is adaptable to most eukaryotic cells where cytotoxic conditions produce these cellular effects. The assay is useful with a variety of fluorescence-detection methodologies.

Sensitive, Safe, and Efficient

The LIVE/DEAD® Viability/Cytotoxicity Kit is more sensitive than Trypan blue exclusion, a commonly used method for live/dead cell discrimination. The cost-effective LIVE/DEAD® Viability/Cytotoxicity Kit is highly sensitive due to the bright fluorescence of both dyes upon interacting with either live (for calcein-AM) or dead (for ethidium homodimer-1) cells. Background levels are low due to the fact that both dyes are virtually non-fluorescent prior to interacting with cells.

LIVE/DEAD® Assays Available for a Broad Range of Applications
A selection of Invitrogen LIVE/DEAD® Viability Assays is offered for mammalian cells, bacteria, yeast and fungi, as well as Fixable Dead Cell Stain Kits for use in intracellular staining for flow cytometry. All LIVE/DEAD® assays provide quick, positive discrimination between viable and non-viable cells.

Related Link
•  Learn More and See the Full Range of LIVE/DEAD® Assay Products.

ReadyProbes™ Cell Viability Imaging Kit, Blue/Green (Invitrogen™)

ReadyProbes® Cell Viability Imaging Kit (Blue/Green) is a ready-to-use assay that can quickly and easily determine the viability of cells. Just add 2 drops each of room temperature, stable NucBlue® Live reagent (Hoechst 33342) and NucGreen® Dead reagent to 1 mL of cell growth media, then determine viability by counting total vs dead cells. NucBlue® Live reagent stains the nuclei of all the cells and can be detected with a standard DAPI filter. NucGreen® Dead reagent stains only the nuclei of cells with compromised plasma membrane integrity and is detected using a standard FITC/GFP (green) filter set. This kit is appropriate for fluorescence microscopy, fluorescence microplate readers, and flow cytometry.

NucBlue® Live reagent: stains the nuclei of all cells; detected with a standard DAPI filter (excitation/emission maxima: 360/460 nm)
NucGreen® Dead reagent: stains only the nuclei of dead cells with compromised plasma membranes; detected with standard FITC/GFP (green) filter set (excitation/emission maxima: 504/523 nm)
See other ReadyProbes® reagents for cell staining
Learn more about other assays for cell viability

Suggestions for use
• NucBlue® Live and NucGreen® Dead reagents may be added directly to cells in full growth media or a compatible buffer solution.
• In most cases, 2 drops/mL and an incubation time of 5 to 30 minutes will give bright nuclear staining; however, optimization may be needed for some cell types, conditions, and applications. In such cases, simply add more or fewer drops until the optimal staining intensity is obtained.

BacLight™ Green Bacterial Stain (Invitrogen™)

The BacLight Green (Cat. no. B-35000) and BacLight Red (Cat. no. B-35001) bacterial stains are fluorescent labeling reagents for detecting and monitoring bacteria. These two dyes are not nucleic acid stains. Bacteria stained with the BacLight Green and BacLight Red bacterial stains exhibit bright green and red fluorescence (absorption/emission ~480/516 and ~581/644 nm, respectively), and can be resolved using the appropriate flow cytometric channels or fluorescence microscopy filters. The BacLight bacterial stains are compatible with formaldehyde or alcohol fixation methods.

View additional information about all microbiological analysis products.

LIVE/DEAD™ BacLight™ Bacterial Viability Kit, for microscopy (Invitrogen™)

The LIVE/DEAD BacLight Bacterial Viability Kit *for microscopy* is a convenient and easy-to-use kit for monitoring the viability of bacterial populations as a function of the membrane integrity of the cell. Cells with a compromised membrane that are considered to be dead or dying will stain red, whereas cells with an intact membrane will stain green.

XTT (2,3-Bis-(2-Methoxy-4-Nitro-5-Sulfophenyl)-2H-Tetrazolium-5-Carboxanilide) (Invitrogen™)

XTT is used to assess cell viability as a function of redox potential. Actively respiring cells convert the water-soluble XTT to a water-soluble, orange colored formazan product. Unlike MTT, XTT does not require solubilization prior to quantitation, thereby reducing the assay time in many viability assay protocols. Moreover, the sensitivity of the XTT reduction assay is reported to be similar to or better than that of the MTT reduction assay.

LIVE/DEAD™ BacLight™ Bacterial Viability Kit, for microscopy & quantitative assays (Invitrogen™)

The LIVE/DEAD BacLight Bacterial Viability Kit *for microscopy and quantitative assays* is a convenient and easy-to-use kit for monitoring the viability of bacterial populations as a function of the membrane integrity of the cell. Cells with a compromised membrane that are considered to be dead or dying will stain red, whereas cells with an intact membrane will stain green.

View additional information about all microbiological analysis products.

LIVE/DEAD™ Fixable Red Dead Cell Stain Kit, for 488 nm excitation (Invitrogen™)

The LIVE/DEAD™ Fixable Red Dead Cell Stain Kit is used to determine the viability of cells prior to the fixation and permeabilization required for intracellular antibody staining or prior to elimination of biohazardous materials using formaldehyde fixation. This kit has been optimized and validated for use with a blue laser flow cytometer.

• 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

View a selection guide for all fixable viability dyes for flow cytometry.

Stable
Unlike products that are sold in solution, the LIVE/DEAD™ Fixable Red Stain has been conveniently packaged in 40-test vials to help ensure the stability and performance of the dye over time. Amine reactive dyes in solution will lose their effectiveness over a short period of time, therefore it is recommended to completely use the vial once rehydrated. If this is not possible, aliquot the vials in small volumes and store at -80°C, avoiding freeze-thaw cycles.

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 Red 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 Red stain was selected based on its fluorescent properties to provide a bright signal when excited with a yellow, green, or blue 488 nm laser. The red-fluorescent reactive dye has an excitation maximum of ~595 nm, making it ideal for use with the yellow laser, and an emission of ~615 nm, allowing collection in the 610 or 630 BP filter. LIVE/DEAD™ Fixable Red Dead Cell stain is also excited well with the blue 488 nm laser. 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.