Same Trusted EZ4U Assay - Now in Eco-Friendlier Packaging

Same Trusted EZ4U Assay – Now in Eco-Friendlier Packaging

Our EZ4U “EASY FOR YOU” Cell Viability & Cytotoxicity Assay is now supplied in updated, eco-friendlier packaging.

While the box has changed, the assay itself remains unchanged. You can continue to rely on the same reagents, specifications, handling, and trusted performance.

EZ4U  Cell Viability & Cytotoxicity Assay (cat.no. BI-5000)

• Non-radioactive and non-toxic
• Convenient single-step incubation for use on living cells
• Widely cited in more than 290 publications

 

The same reliable EZ4U assay — now presented in more sustainable packaging.

About Cell proliferation and Cytotoxicity Assays

Cell proliferation and cytotoxicity assays are essential tools in cell biology, supporting research into growth factors, cytokines, nutrients, and potential therapeutic compounds.

Traditional methods for assessing cell number or viability can be time-consuming, labor-intensive, or require radioactive materials. Tetrazolium-based assays offered an important alternative by using the metabolic activity of living cells to generate a measurable color signal. However, earlier formats often required additional solubilization steps or produced unstable reaction products.

The EZ4U Cell Proliferation and Cytotoxicity Assay was developed to simplify this workflow. It uses a non-radioactive, non-toxic tetrazolium substrate that is reduced by viable cells into a soluble, stable colored product, allowing convenient measurement without extra solubilization steps.

Biomedica’s research team addressed these limitations by developing the EZ4U Cell Proliferation and Cytotoxicity Assay: a rapid, reliable, non-isotopic assay designed for easy integration into standard cell culture workflows.

EZ4U is highly compatible with conventional thymidine incorporation assays, so no major changes to the experimental setup or labeling procedure are required. The chromogenic substrate can be added directly to the culture medium, without removing medium before or after incubation. No harvesting or solubilization steps are needed.

The result is a convenient assay that combines important advantages of thymidine and MTT-based methods: accuracy, speed, reliability, and ease of use. Based on Biomedica’s data, the chromophore appears to be non-toxic, allowing further incubation or combined approaches, such as double labeling with EZ4U and a radioactive nucleotide to assess both cell viability and DNA content.

Further reading:

Tolerability of N-chlorotaurine in comparison with routinely used antiseptics: an in vitro study on chondrocytes. Pilz Met al., J. Pharmacol Rep. 2024; 6(4):878-886. PMID: 38758471.

Abstract

Background: Currently, povidone-iodine (PVP-I) and hydrogen peroxide (H₂O₂) are frequently used antiseptics in joint infections, but the cytotoxic effects of these solutions are already reported. N-chlorotaurine (NCT) shows a broad-spectrum bactericidal activity and is well tolerated in various tissues, but its effect on human chondrocytes is unknown. The purpose of this study was to assess the cytotoxic effect of NCT, PVP-I, and H₂O₂ on human chondrocytes compared to a control group in an in vitro setting to get first indications if NCT might be a promising antiseptic in the treatment of septic joint infections for the future.

 Material and methods: Chondrocytes extracted from human cartilage were incubated with various concentrations of NCT, PVP-I, and H₂O₂ for 5 and 30 min respectively. EZ4U cell viability kit was used according to the manufacturer’s recommendations determining cell viability. To assess cell viability based on their nuclear morphology, cells were stained with acridine-orange and identified under the fluorescence microscope.

Results: EZ4U kit showed after 5 and 30 min of incubation a significant decrease in cell viability at NCT 1%, NCT 0.1%, PVP-I, and H₂O₂, but not for NCT 0.001% and NCT 0.01%. Acridine-orange staining likewise presented a significant decrease in vital cells for all tested solutions except NCT 0.001% and NCT 0.01% after 5 and 30 min of incubation.

Conclusion: Our results demonstrate that NCT is well tolerated by chondrocytes in vitro at the tested lower NCT concentrations 0.01% and 0.001% in contrast to the higher NCT concentrations 1% and 0.1%, PVP-I (1.1%), and H₂O₂ (3%), for which a significant decrease in cell viability was detected. Considering that the in vivo tolerability is usually significantly higher, our findings could be an indication that cartilage tissue in vivo would tolerate the already clinically used 1% NCT solution. In combination with the broad-spectrum bactericidal activity, NCT may be a promising antiseptic for the treatment of septic joint infections.