powder, BioReagent, suitable for cell culture, suitable for insect cell culture, ≥97.5% (HPLC)

3-(4,5-二甲基-2-噻唑)-2,5-二苯基溴化四氮唑噻唑蓝, 噻唑蓝四唑蓝, 噻唑四唑蓝溴化盐
Empirical Formula (Hill Notation):
EC 号:






≥97.5% (HPLC)




cell culture | insect: suitable
cell culture | mammalian: suitable


195 °C (dec.) (lit.)


H2O: 5 mg/mL



SMILES string




InChI key


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噻唑蓝四唑蓝(MTT)可用于细胞增殖的检测。 MTT产生一种淡黄色的溶液,通过活细胞的线粒体脱氢酶将其转化为深蓝色、不溶于水的MTT福尔马赞。该蓝色晶体可溶于酸化异丙醇,可采用比色法测定其570 nm处的强度。MTT已被用作组织化学/细胞化学试剂 以及用于检测NAD。 由于所使用的氰化物陷阱可与阳离子结合,组织中的ADP-连接酶系统无法采用MTT检测。 MTT迅速还原为福尔马赞,福尔马赞与镍、铜和钴螯合;钴螯合物已可用于氧化体系。


1 g in glass bottle
15 mg in poly bottle
100, 500 mg in glass insert


Exclamation markHealth hazard




Eye Irrit. 2 - Muta. 2 - Skin Irrit. 2 - STOT SE 3


Respiratory system


11 - Combustible Solids




Not applicable


Not applicable


Eyeshields, Gloves, type N95 (US)


原产地证书 (CofO)

  1. Which document(s) contains shelf-life or expiration date information for a given product?

    If available for a given product, the recommended re-test date or the expiration date can be found on the Certificate of Analysis.

  2. What can be used to make a solution of Thiazolyl Blue Tetrazolium Bromide (MTT)?

    We test the solubility of MTT in water at a concentration of 5 mg/mL.  For the MTT viability assay, we dissolve Product No. M5655 at a concentration of 5 mg/ml in RPMI-1640 without phenol red. This medium is available as a powder (Product No.R8755) or liquid (Product No. R7509). MTT can be solubilized in any culture media or balanced salt solution that does not contain phenol red as a pH indicator.

  3. How can I store solutions of Thiazolyl Blue Tetrazolium Bromide (MTT)?

    Reconstituted MTT solution is stable for at least 6 months when stored frozen (-20 °C). Storage of reconstituted MTT solution at 2-8°C for more than 2 weeks may cause decomposition and yield erroneous results.

  4. What can be used to solubilize MTT formazan (the product of the Thiazolyl Blue Tetrazolium Bromide - MTT reaction)?

    Mitochondrial dehydrogenases of viable cells cleave the tetrazolium ring of the MTT, yielding purple MTT formazan crystals. These crystals are not soluble in aqueous solutions; they may be dissolved in acidified isopropanol (0.1 N HCl in anhydrous isopropanol). If this does not lyse the cells, Triton X-100 can be added to the acidified isopropanol. A typical working concentration is 10% Triton X-100 (i.e., 1 volume of 100% Triton X-100 + 9 volumes of acidified isopropanol).

  5. Why is a reference wavelength used for data analysis of Thiazolyl Blue Tetrazolium Bromide (MTT)?

    The reference wavelength (630-690 nm) is used to adjust for the optical variation in the wells of the plate.  It also corrects for dust and fingerprints that can be present.  The assay is read at 570 nm.  The reference wavelength needs to be far enough away from the assay wavelength so as not to affect those values.

  6. What type of multi-well plate should be used for the Thiazolyl Blue Tetrazolium Bromide (MTT) assay?

    It is recommended that flat bottom multi-well plates be used for the MTT assay. The use of tissue culture treated plates is only important if necessary for good cell growth.  If cells are grown in larger plates, the supernatant after cell lysis can be transferred to a 96 well plate for reading.

  7. How do I get lot-specific information or a Certificate of Analysis?

    The lot specific COA document can be found by entering the lot number above under the "Documents" section.

  8. How do I find price and availability?

    There are several ways to find pricing and availability for our products. Once you log onto our website, you will find the price and availability displayed on the product detail page. You can contact any of our Customer Sales and Service offices to receive a quote.  USA customers:  1-800-325-3010 or view local office numbers.

  9. What is the Department of Transportation shipping information for this product?

    Transportation information can be found in Section 14 of the product's (M)SDS.To access the shipping information for this material, use the link on the product detail page for the product. 

  10. Is the MTT assay quantitative?

    The MTT asay is a method to assess cell viability.  This assay is a semiquantitative assay. The assay is used to compare the viability changes in treated cells to untreated cells. The absorbance is indicative of the cell number. The higher the absorbance, the greater the number of viable cells present. Most researchers compare the absorbance of the two samples as a ratio (ABS treated cells/ABS untreated cells) to get a fold increase/decrease in cell number.   

  11. How can Thiazolyl Blue Tetrazolium Bromide be used for staining dehydrogenase in tissue sections?

    Products M2128 or M5655, Thiazolyl Blue Tetrazolium Bromide can be used for staining dehydrogenase in tissue sections. See the method below. Reagent PreparationMTT (2 mg/ml distilled water) 2.5 ml0.2 M Tris buffer, pH 7.4 2.5 ml0.5 M cobalt chloride 0.5 ml0.05 M magnesium chloride 1.0 mlDistilled water 2.5 mlThe pH of this solution is adjusted to 7.0 if necessary. Aliquot and store at -20°C until required. Sample PreparationCut cytostat sections at 5 to 7 microns. Do not fix. Method:1. Incubate sections in appropriate incubation solution at 37°C for 30-60 minutes.2. Transfer sections to 15% formol saline, 15 minutes.3. Wash in distilled water4. Counterstain in 2% methyl green if required.5. Wash in distilled water.6. Mount in glycerin Jelly. ResultsEnzyme: Black formazan deposits with MTT Source:  Bancroft and Gamble, Theory and Practice of Histological Techniques, Fifth Edition. Churchill Livingstone, London, 2002, page 610.

  12. My question is not addressed here, how can I contact Technical Service for assistance?

    Ask a Scientist here.

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