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Electrochemical Determination of Flavonoid Fisetin in Commercial Dietary Supplements Using a Boron-Doped Diamond Electrode

ChemistrySelect, ISSN: 2365-6549, Vol: 8, Issue: 14
2023
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For the first time, a boron-doped diamond electrode was utilized to quantitatively determine flavonoid fisetin (FST). Cyclic voltammetric studies have shown that the electrochemical oxidation of FST is irreversible and well-separated two peaks (P and P) in 0.1 M HNO solution. The effects of electrode pretreatment, solution pH, nature of the supporting electrolyte, and instrumental variables on the peak current and potentials of the FST were investigated by square-wave voltammetry (SWV) and then optimum ones were determined. It was observed that the cathodically pre-treated BDD (CPT-BDD) electrode‘s performance was better than the other pre-treatment procedures for increasing the FST oxidation signal. Under optimized conditions and using the SWV technique, the response of the first anodic peak (P) of the FST was proportional in a concentration range of 0.5–20.0 μg mL (1.7×10–6.9×10 mol L) with a detection limit of 0.08 μg mL (2.8×10 mol L). Also, it was successfully demonstrated that the proposed method is applicable in commercial nutritional supplement formulations.

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