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CellTiter-Fluor Cell Viability Assay

by Promega
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  • Overview
  • Protocols
  • Specifications
  • Resources
  • The CellTiter-Fluor™ Cell Viability Assay is a non-lytic, single-reagent-addition fluorescence assay that measures the relative number of viable cells in a population. The assay is based on measurement of a conserved and constitutive protease activity within live cells and therefore serves as a biomarker of cell viability. The live-cell protease activity is restricted to intact viable cells and is measured using a fluorogenic, cell-permeant, peptide substrate (Gly-Phe-AFC). The substrate enters intact cells, where it is cleaved by the live-cell protease activity to generate a fluorescent signal proportional to the number of living cells. The live-cell protease becomes inactive upon loss of membrane integrity and leakage into the surrounding culture medium.

    The CellTiter-Fluor™ Assay also can be used in a single-well, sequential, multiplex format with other downstream assay chemistries to normalize data by cell number. Data from the assay can serve as an internal control and allow identification of errors resulting from cell clumping or compound cytotoxicity. The assay is compatible with many Promega luminescence assays or spectrally distinct fluorescence assay methods, such as measuring caspase activation, reporter gene expression or orthogonal measures of viability.


    CellTiter-Fluor Cell Viability Assay Chemistry


    Multiplexing CellTiter-Fluor and Caspase-Glo 3/7 Assays

    The CellTiter-Fluor™ Reagent was added to wells and viability measured after incubation for 30 minutes at 37°C. Caspase-Glo® 3/7 Reagent was added and luminescence measured after a 30-minute incubation (10,000 cells/well).

  • Protocols

    Complete Protocol

    Download PDF

    CellTiter-Fluor™ Cell Viability Assay Technical Bulletin

    PDF (482 KB)

  • Certificate of Analysis

    Lookup Certificate of Analysis

    Storage Conditions

    -30C TO -10C

    Use Restrictions

    For Research Use Only. Not for Use in Diagnostic Procedures.

  • Resources