The fluorogenic probe dihydroethidium (DHE) is widely used for detecting intracellular superoxide. DHE oxidation by superoxide generates specifically the compound 2-hydroxyethidium (2-EOH), so that 2-EOH detection confers specificity to superoxide assessment among many other reactive oxygen species. However, DHE oxidation in biological systems leads to formation of other fluorescent products, particularly ethidium, usually formed at higher quantities than 2-EOH. Since both 2-EOH and ethidium are fluorescent, their identification and quantification is possible only after their physical separation by HPLC. Here we describe the detailed procedures for superoxide measurement in cells (adhered or not) and fresh tissues fragments, followed by acetonitrile extraction and simultaneous fluorescent detection of 2-EOH and ethidium and absorbance detection of remaining unreacted DHE. In addition we report the use of DHE/HPLC for measuring NADPH oxidase activity in enriched-membrane fraction isolated from cells or tissues. These methods can improve accuracy and precision of quantitative superoxide measurements in biological samples.
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