Alamar Blue™

Alamar Blue™ is a safe, nontoxic, aqueous dye that is used to assess cell viability and cell proliferation and is supplied as a sterile indigo-colored liquid. Alamar Blue has also been shown to be a rapid and simple non-radioactive assay alternative to the [3H] thymidine incorporation assay. AlamarBlue contains resazurin and additional compounds to prevent the over-reduction of resazurin to a non-fluorescent product. These additives also slow the rate of generation of the fluorescent product. Consequently, the alamarBlue assay requires longer incubation times compared to resazurin.

Suitable for use in Cell Viability Assessment and Cell Proliferation Assessment in Immunofluorescence and ELISA.

The innate metabolic activity of cells can be monitored with Alamar Blue™. In the presence of added toxic compounds such as antimicrobial agents, this innate metabolic activity ceases. Procedures which cite the use of Alamar Blue™ in assays of efficacy of antimicrobial agents call for the determination of Alamar Blue™ reduction at a single predetermined time point.

Alamar BlueTM is soluble, stable in culture medium and is non-toxic. The continuous monitoring of cells in culture is therefore permitted. Specifically, Alamar Blue™ does not alter the viability of cells cultured for various times as monitored by Trypan Blue exclusion. Cells grown in the presence of Alamar Blue™ and subsequently analyzed by Flow Cytometry for CD44, CD45RB, CD4 and heat stable antigen are found to produce similar numbers of viable cells and antigen expressing cells as non- Alamar Blue™ exposed cells. Because Alamar Blue™ is non-toxic, the cells under study can be returned to culture or used for other purposes including histological studies. Proliferation measurements with Alamar Blue™ may be made either spectrophotometrically by monitoring the absorption of Alamar Blue™ supplemented cell culture media at two wavelengths. Alternatively, proliferation measurements with Alamar Blue™ may be made fluorometrically.

25 ml: 2500 wells/96-well plate @ 100ul/well

530-560⁄590

May be stored at 4°C, -20°C or -70°C. When stored frozen, it is important to warm to 37°C upon thawing and mixed well to be assured of complete resolubilization. Protect from light. Storage at RT under lighted conditions adversely affects its absorbance properties.

This product as supplied is intended for research use only, not for use in human, therapeutic or diagnostic applications without the expressed written authorization of United States Biological. Toxicity and Hazards