PromoKine’s Colorimetric Cell Viability Kits utilize the tetrazolium salts MTT, XTT, WST-1 or WST-8 that are reduced to orange formazan dyes by dehydrogenases present in viable cells. The absorbance of the formazan dyes is proportional to the number of metabolically active cells and can be measured directly without additional processing.
Our Bioluminescent Cell Viability Kits measure the ATP level as a marker for cell viability in mammalian cells and utilize the enzyme luciferase to catalyze the ATP-dependent, light-producing oxidation of luciferin. This light formation can be measured using a luminometer or beta counter.
More reagents and kits for cell staining and analysis of cellular processes (e.g. apoptosis, cytotoxicity, cell signaling & metabolim) can be found on our website.