MTT Assay

Cell Growth & Viability Assessment

In the fields of drug discovery, toxicology, and regenerative medicine, accurately quantifying cellular responses to experimental stimuli is fundamental. Our Cell Growth Assessment Service provides a robust analytical framework to evaluate the proliferation, health, and metabolic activity of your cell lines. By utilizing two distinct yet complementary methodologies, MTT Cytotoxicity Assay and Trypan Blue Dye Exclusion Assay, we offer a multi-faceted view of cellular behavior, ensuring your data is both reproducible and biologically significant.

• MTT Cytotoxicity Assay: Measuring Metabolic HealthThe MTT assay is a colorimetric gold standard used to measure cellular metabolic activity as a proxy for cell viability, proliferation, and cytotoxicity. 
• The Mechanism: This assay relies on the ability of nicotinamide adenine dinucleotide phosphate (NADPH)-dependent cellular oxidoreductase enzymes to reduce the yellow tetrazolium salt, MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide), into insoluble, purple-colored formazan crystals.
• The Outcome: Since this reduction only occurs in metabolically active cells, the intensity of the purple color (measured via spectrophotometry) is directly proportional to the number of viable cells in the sample.
• Best For: High-throughput screening of drug candidates, determining IC50 values, and assessing long-term effects of compounds on cell proliferation.Trypan Blue Dye Exclusion: Assessing Membrane Integrity. The Trypan Blue assay provides a direct physical count of live versus dead cells based on cell membrane integrity.

• Trypan Blue Dye Exclusion: Assessing Membrane Integrity. The Trypan Blue assay provides a direct physical count of live versus dead cells based on cell membrane integrity.
• The Mechanism: Trypan Blue is a vital stain that cannot cross the intact cell membranes of healthy, living cells. However, in cells with compromised membranes (dead or dying cells), the dye penetrates the cytoplasm, staining the cell a distinct blue.
• The Outcome: Using a hemocytometer or automated cell counter, we calculate the Total Cell Count and the Percentage Viability. This allows for a clear distinction between a decrease in growth rate (cytostatic effect) and actual cell death (cytotoxic effect).
• Best For: Routine monitoring of culture health, validating seeding densities, and immediate assessment of acute toxicity following treatment.

Why Choose Our Combined Approach? While either assay can provide valuable data, using them in tandem offers a more complete biological narrative. The MTT assay identifies subtle changes in metabolic vigor that may precede physical cell death, while Trypan Blue confirms the actual loss of cell viability. Together, they provide the rigorous validation required for high-impact research or product information.