XTT dye

XTT dye

XTT dye is a water-soluble tetrazolium salt used primarily in colorimetric assays to evaluate cell viability and metabolic activity. Upon entering metabolically active cells, XTT undergoes reduction by mitochondrial oxidoreductases—enzymes present only in living cells. This reduction reaction, facilitated by electron acceptors or coupling reagents, converts the yellow XTT compound into an orange-colored formazan product. Unlike other tetrazolium-based assays, the orange formazan produced by XTT is soluble in aqueous solutions, which allows direct quantification of viable cells without additional steps like cell lysis or solubilization.

The XTT Cell Viability Assay Kit by TribioScience is specifically designed to capitalize on these properties for rapid and reliable assessment of cell health. The assay is straightforward: cells are cultured in a 96-well plate, followed by the addition of an XTT working solution, and after incubation, the absorbance is measured at 450 nm. The intensity of the orange formazan correlates directly with the number of metabolically active cells in the sample. This simplicity is further enhanced by the assay’s non-radioactive nature and the elimination of wash or cell transfer steps, making it suitable for high-throughput screening.

This assay is broadly applicable in biological and pharmaceutical research, particularly for testing the effects of growth factors, cytokines, and potential cytotoxic agents such as anticancer drugs. It supports various applications including measuring cell proliferation, drug toxicity, and apoptosis. The assay’s sensitivity and accuracy make it a preferred choice for researchers who need reliable data on cell viability in research environments.