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R&D Systems™ XTT Reagent

R&D Systems™ XTT Reagent is for use with TACS XTT Cell Proliferation Assay.

Manufacturer:  R&D Systems™ 489102501

Catalog No. 48-910-2501

This item has been discontinued by the manufacturer and is no longer available. Please call customer service for assistance: 1-800-766-7000.

This item is not returnable. View return policy



  • Use a manual defrost freezer and avoid repeated freeze-thaw cycles.
  • Do not use past expiration date.
  • The stock is provided at a 3X concentration (0.9mg/mL) in RPMI medium without phenol red.
  • A volume of 5mL is sufficient to run one microplate.
  • XTT will precipitate during storage. Therefore, the solution must be warmed to 37°C for several minutes until it is no longer opaque.
  • Heating for unnecessary and extended periods of time will result in reduction of the XTT.
  • Contains a 0.9mg/mL solution of XTT (2,3-Bis(2- methoxy-4-nitro-5-sulfophenyl)-2H-tetrazolium-5-carboxanilide, CAS # 111072-31-2).
  • XTT is toxic and may cause heritable genetic defects.
  • In case of contact, immediately flush eyes or skin with copious amounts of water. If swallowed, wash out mouth with water provided person is conscious.


Store the unopened product at -20 to -70° C. Use a manual defrost freezer and avoid repeated freeze-thaw cycles. Do not use past expiration date.
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