Thiazolyl Blue, with the CAS number 298 - 93 - 1, is a highly valuable chemical compound. It is also known by other names such as 3-(4,5-Dimethyl-2-thiazolyl)-2,5-diphenyl-2H-tetrazolium bromide or MTT.
This product comes in a high - quality form, ensuring its reliability for various applications. It typically appears as a yellow to orange powder. The molecular formula of Thiazolyl Blue is C₁₈H₁₆BrN₅S, and its molecular weight is approximately 418.32 g/mol. It has a melting point in the range of 195 - 198°C. The compound is soluble in water, and its solubility can be affected by factors such as temperature and pH.
Thiazolyl Blue has a wide range of applications in the scientific and medical fields. One of the most well - known uses is in cell viability assays. In biological research, it is used to measure the metabolic activity of cells. Live cells can reduce MTT to formazan, a purple - colored product. By measuring the absorbance of the formazan at a specific wavelength, researchers can determine the number of viable cells in a sample. This is crucial for studying cell proliferation, cytotoxicity of drugs, and the effects of various agents on cell survival.
It is also used in microbiology. For example, it can be used to assess the growth and viability of bacteria and fungi. In the field of drug discovery, MTT assays help in screening potential drug candidates by evaluating their effects on cell health. Additionally, it has applications in tissue engineering to evaluate the viability and function of engineered tissues.
When using Thiazolyl Blue for cell viability assays, the following steps are typically involved. First, prepare a stock solution of MTT. Dissolve the MTT powder in phosphate - buffered saline (PBS) or other appropriate solvents to obtain a concentration of around 5 mg/mL. Filter - sterilize the solution to remove any potential contaminants.
Then, add the cells of interest to a multi - well plate and allow them to grow and adhere for an appropriate period. After that, add the MTT solution to each well at a suitable volume. Incubate the plate at 37°C for a few hours (usually 2 - 4 hours). During this time, viable cells will reduce the MTT to formazan. Next, remove the supernatant carefully without disturbing the formazan crystals. Add a solubilization solution, such as dimethyl sulfoxide (DMSO) or isopropanol, to dissolve the formazan. Finally, measure the absorbance of the solution at a wavelength of 570 nm using a microplate reader.
Case 1: In a cancer research project, a team of scientists wanted to evaluate the cytotoxicity of a new anti - cancer drug. They cultured cancer cells in a 96 - well plate and treated them with different concentrations of the drug. After a certain incubation period, they added MTT solution to each well. After 3 hours of incubation at 37°C, they observed that in the wells with higher drug concentrations, the color change of the MTT to formazan was less intense compared to the control wells. By measuring the absorbance, they were able to calculate the IC₅₀ value of the drug, which is the concentration that inhibits 50% of the cell growth. This data was crucial for determining the potential effectiveness of the drug.
Case 2: In a microbiology study, researchers were studying the growth of a particular strain of bacteria under different environmental conditions. They used MTT to monitor the bacterial viability. By adding MTT to the bacterial cultures at regular intervals and measuring the formazan production, they could track the growth curve of the bacteria. They found that under certain nutrient - limiting conditions, the bacteria's ability to reduce MTT was significantly decreased, indicating a slowdown in their metabolic activity.
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