Abstract
The antioxidant activity of the Hibiscus sabdariffa L. (H.s.) used in the food-processing industry inspired a low cost and environmentally friendly chemical modification for a nanostructured electrode. Titanium dioxide nanotubes (TiO2-Nts) grown by anodic oxidation from Ti foil are well-known for their richness of adsorption sites for organic compounds and also for their great electron mobility allowance, which makes them an excellent choice for modified electrode engineering. This study evidences the complexation of the anthocyanins from H.s. to the TiO2-Nts electrode through FTIR and UV-Vis spectroscopy and electrochemical characterization (cyclic voltammetry). This novel electrode showed remarkable stability and regeneration capability. This research also establishes a new method to quantify hydrogen peroxide in solution with a limit of linearity of 2.50 × 10−4 M and a detection limit of 4.50 × 10−6 M.
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