Study of electrochemical determination of capsaicin and dihydrocapsaicin at carbon paste electrodes modified by β-cyclodextrin
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In this work, we showed electrochemical evidences that α-, β-, and γ-cyclodextrins (CDs) form inclusion complex in a solution with capsaicin (CP). The electrochemical behavior of CP was evaluated on carbon paste electrodes modified with CDs. The modified electrodes exhibited a markedly enhanced Faradic current compared with the naked electrode. Our results show that CP accumulates at the surface of the modified electrodes. The electrode modified with β-CD presented best behavior. Consequently, the analytical performance was examined with this electrode. The sensitivity further improves of determination of CP on β-CD electrode at low pH and at low amounts of β-CD. The range of linearity for CP quantification was between 1.6 and 61 μmol L−1. LOD and LOQ were the best for CP at 0.062 and 0.200 μmol L−1, respectively. Square wave voltammetry was then used to study CP and dihydrocapsaicin (DHCP) at electrodes modified with β-CD. Voltammograms of both capsaicinoids showed peaks at the same potential. However, the current is notably larger for DHCP and the voltammograms were distinct for each capasicinoid. The linearity range for CP was between 1.3 and 9.3 μmol L−1, while the LOD was 0.2102 μmol L−1, and the LOQ was 0.7 μmol L−1. For DHPC, the linearity range was 0.69–6.7 μmol L−1, LOD was 0.09041 μmol L−1, and LOQ was 0.301 μmol L−1. No analyte preconcentration was required. Tabasco sauce was then analyzed using this method and the result was equivalent to those obtained with high performance liquid chromatography. © 2018 Elsevier B.V.
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Capsaicin; Cyclodextrin modified electrodes; Dihydrocapsaicin; Electrochemical determination Chemical detection; Cyclodextrins; Drug products; Electrodes; High performance liquid chromatography; Liquid chromatography; Voltammetry; Analyte preconcentration; Capsaicin; Carbon paste electrode; Dihydrocapsaicin; Electrochemical behaviors; Electrochemical determination; Modified electrodes; Square wave voltammetry; Electrochemical electrodes
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