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XTT Cell Viability Assay Kit

XTT Cell Viability Assay Kit provides a simple method for determining live cell numbers using standard photometric microplate readers. Determination of live cell numbers is often used to assess the rate of cell proliferation and to screen cytotoxic agents.

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Apoptosis/viability marker

Metabolic activity

For live or fixed cells

For live/intact cells

Detection method/readout

Microplate reader (absorbance)

Assay type/options

Endpoint assay, Real-time imaging, Homogenous assay, High-throughput assay

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1,000 assays
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Product Description

The XTT Cell Viability Assay Kit provides a simple method for determining live cell numbers using standard photometric microplate readers. Determination of live cell numbers is often used to assess the rate of cell proliferation and to screen cytotoxic agents. XTT is a tetrazolium derivative. Similar to MTT, XTT measures cell viability based on the activity of mitochondrial enzymes in live cells that reduce XTT and are inactivated shortly after cell death. Unlike MTT, XTT is reduced to a highly water-soluble orange-colored product instead of the insoluble formazan from MTT, thus eliminating the solubilization step required for the MTT assay. The amount of water-soluble product generated from XTT reduction is proportional to the number of living cells in the sample and can be photometrically quantified at 475 nm. Continuous color development permits measurements at multiple time points for extended detection range.

References

1. J Infect Dis 172, 1153 (1995).

2. J Immunol Methods 159, 81 (1993).

3. J Immunol Methods 147, 153 (1992).

4. J Immunol Methods 142, 257 (1991).

5. J Natl Cancer Inst 81, 577 (1989).

6. Cancer Res 48, 4827 (1988).

 

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Support & Faq

Apoptosis, Necrosis, and Cell Viability Kits

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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Check to make sure your cell densities are in the linear range of the cell viability assay. Too few cells may fall below the limit of detection, and too many cells may saturate the OD. Perform an initial experiment to check the best linear range for your cell type and experimental set-up. You may need to vary the cell density assay incubation time. The kit protocols provide general guidelines and may need to be optimized for your experimental system.

Category: Apoptosis, Necrosis, and Cell Viability Kits

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Resazurin is reduced by cells to the fluorescent product resorufin. Resorufin can be reduced further to a non-fluorescent compound. Therefore the densest wells may have lowest fluorescence due to over-reduction of the substrate. Please see the product information sheet for more details. The kit protocol provides general guidelines and may need to be optimized empirically for your experimental system. You may need to vary cell density or assay incubation time to ensure that your samples fall in the linear range of the kit.

Category: Apoptosis, Necrosis, and Cell Viability Kits

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