Spectrofluorimetric determination of hydrogen peroxide scavenging activity
| Autor: | Marzanna Paździoch-Czochra, Anna Wideńska |
|---|---|
| Rok vydání: | 2002 |
| Předmět: |
Chromatography
Antioxidant biology medicine.medical_treatment Homovanillic acid Fluorescence spectrometry Biochemistry Analytical Chemistry chemistry.chemical_compound chemistry biology.protein medicine Environmental Chemistry Organic chemistry Glucose oxidase Trolox Hydrogen peroxide Xanthine oxidase Spectroscopy Peroxidase |
| Zdroj: | Analytica Chimica Acta. 452:177-184 |
| ISSN: | 0003-2670 |
| DOI: | 10.1016/s0003-2670(01)01455-6 |
| Popis: | Homovanillic acid (HVA) is widely used for the detection and imaging of oxidative enzymes—peroxidase, glucose oxidase and xanthine oxidase, but antioxidant activity has not been determined so far with the use of HVA. We have developed a simple, sensitive and in-field spectrofluorimetric method for the determination of hydrogen peroxide (H2O2) scavenging activity. The assay is based on the oxidation of HVA to its fluorescent biphenyl dimer in the presence of H2O2 and peroxidase. The presence of substances with H2O2 scavenging activity prevents the oxidation of HVA by removing H2O2. The decrease in fluorescence intensity is proportional to the antioxidative (H2O2 scavenging) activity. The method was evaluated using Trolox (6-hydroxy-2,5,7,8-tetramethylchromane-2-carboxylic acid), BHA (3-t-butyl-4-hydroxyanisole) and ferulic, vanillic, caffeic, chlorogenic, protocatechuic and oxalic acids. Additionally, tea and herb infusions known for their antioxidant properties were evaluated. |
| Databáze: | OpenAIRE |
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