Methylthialazole Tetrazolium, also known as MTT or Tetrazolium Bromide, is a cell-permeable and positively charged tetrazolium dye that is used to detect reductive metabolism in cells.1 It is taken up by cells through the plasma membrane and then reduced to formazan by intracellular NAD(P)H-oxidoreductases. It is frequently used in colorimetric assays to measure cell proliferation, cytotoxicity, and apoptosis.

Providing storage is as stated on the product vial and the vial is kept tightly sealed, the product can be stored for up to 24 months.
Wherever possible, you should prepare and use solutions on the same day. However, if you need to make up stock solutions in advance, we recommend that you store the solution as aliquots in tightly sealed vials at -20°C. Generally, these will be useable for up to one month. Before use, and prior to opening the vial we recommend that you allow your product to equilibrate to room temperature for at least 1 hour.