Cayman Chemical ROS Detection Cell-Based Assay Kit (DHE)

The Cayman Chemical ROS Detection Cell-Based Assay Kit (DHE) measures superoxide and hydrogen peroxide levels in living cells. It is suitable for flow cytometry and plate-based methods.

Dihydroethidium (hydroethidine or DHE) is a widely used ethidium-based, redox-sensitive fluorescent probe. DHE has been shown to be oxidised by superoxide to form 2-hydroxyethidium (2-OH-E⁺) (ex 500–530 nm/em 590–620 nm) or by non-specific oxidation by other sources of reactive oxygen species (ROS) to form ethidium (E⁺) (ex 480 nm/em 576 nm). Given their narrow spectral range, distinguishing between the two species using filter-based optical systems is often difficult and can lead to misreporting of the species of ROS being generated.

The assay kit uses DHE as a fluorescent probe for the detection of ROS generation directly in live cells. Antimycin A, an inhibitor of complex III of the mitochondrial electron transport chain, is included as a positive control for ROS generation. N-acetyl Cysteine is included as an antioxidant control.