The Cell Counting Kit-8 (CCK-8) provides a more convenient and sensitive method for the research of cell number determination and cell proliferationtotoxicity assays than previous ways. The kit utilizes a highly water-soluble tetrazolium salt, WST-8, which produces a water-soluble formazan dye upon reduction in the presence of an electron mediator. The amount of the formazan generated by dehydrogenases is directly in proportion to the numbers of living cells. The detection sensitivity by CCK-8 is higher than other tetrazolium salts such as MTT, XTT, MTS or WST-1.

• More Sensitive than MTT, MTS, or WST-1
• No Toxicity to Cell
• Simpler Steps, No organic solvents required
• Stable One Bottle Solution, ready-to-use

CCK-8 is stable exceeding one year at 0-5°C with protection from light. For longer storage, store it at -20°C. Repeated thawing and freezing will cause an increase in the background, which will interfere with your assay. Please store the kit at 0-5°C for frequent use.