Guaicolic spices curcumin and capsaicin electrochemical oxidation behaviour at a glassy carbon electrode

Manaia, Márcia Andreia Nogueira; Diculescu, Victor C.; Gil, Eric de Souza; Oliveira-Brett, Ana Maria

doi:10.1016/j.jelechem.2012.06.023

Cited by 44 publications

(49 citation statements)

References 30 publications

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“…The similar results were obtained by Manaia et al 37 at a glassy carbon electrode. The peak at 0.56 V related to the oxidation process of curcumin.…”

Section: Electrochemical Behavior Ofsupporting

confidence: 90%

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A Newly Developed Electrocatalytic Oxidation and Voltammetric Determination of Curcumin at the Surface of PdNp-graphite Electrode by an Aqueous Solution Process with Al3+

Çakır¹,

Bíçer²,

Arslan³

2015

Croat. Chem. Acta

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Abstract. In the first stage, the palladium nanoparticles (PdNps)-coated graphite electrode (PdNp/GE) has been prepared. Scanning electron microscopy (SEM) technique showed that the palladium nanoparticles were uniformly distributed with an average particle diameter of 60-75 nm. And then, a novel-modified electrode has been developed by the physical deposition of Al 3+ ions on palladium nanoparticles (PdNps)-coated graphite electrode (Al 3+ /PdNp/GE). This modified electrode was characterized by square-wave voltammetry (SWV), cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The sensitivities of PdNp/GE and Al 3+ /PdNp/GE electrodes were tested with dopamine. Al 3+ /PdNp/GE exhibited a catalytic activity for curcumin oxidation. The square-wave voltammogram of curcumin in phosphate buffer (pH = 2) gave an anodic peak at 0.56 V. The anodic peak current of curcumin was found to be linearly related to its concentration in the range of 3.0 × 10 -8 M to 6.0 × 10 -7 M with a detection limit of 2.2  10 -8 M. It was also found that the novel Al 3+ /PdNp/GE electrode had the best sensitivity when compared to glassy carbon electrode (GCE), hanging mercury drop electrode (HMDE) and glassy carbon electrode electropolymerized with acid chrome blue K (poly-ACBK/GCE), used for the determination of curcumin. The curcumin was detected in marketed spices sample of turmeric powder. Pure turmeric powder had the highest curcumin concentration, averaging 4.317 ± 0.175 % by weight.

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“…The similar results were obtained by Manaia et al 37 at a glassy carbon electrode. The peak at 0.56 V related to the oxidation process of curcumin.…”

Section: Electrochemical Behavior Ofsupporting

confidence: 90%

“…However the peaks at 0.50 and 0.30 V can be attributed to the reduction of the different oxidation products of curcumin. 37 According to the literature, 37 the redox reactions for the voltammetric signals of curcumin may be given in Scheme 2.…”

Section: Electrochemical Behavior Ofmentioning

confidence: 99%

A Newly Developed Electrocatalytic Oxidation and Voltammetric Determination of Curcumin at the Surface of PdNp-graphite Electrode by an Aqueous Solution Process with Al3+

Çakır¹,

Bíçer²,

Arslan³

2015

Croat. Chem. Acta

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“…The same behavior is observed for the hydroxycinnamic derivatives (not shown). From such similarities it could be inferred the redox behavior of coffee beverage samples are governed by ''catechol like'' major markers, which are recognized by their great antioxidant properties Manaia, Diculescu, Gil, & Oliveira-Brett, 2012 Furthermore, it was also noticed that the peaks, 2a and 3a, observed only in the coffee crude samples, are not related to oxidation products of the main major markers (Fig. 3A).…”

Section: Electrochemical Characterizationmentioning

confidence: 84%

Electrochemical behavior and determination of major phenolic antioxidants in selected coffee samples

et al. 2016

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“…Cyclic voltammetry (CV) on carbon‐based electrodes in organic and water‐organic media is successfully applied for the investigation of capsaicinoids electrooxidation . An interesting approach for capsaicin determination on GCE is based on the combination of fast‐scan DPV with flow injection analysis system .…”

Section: Introductionmentioning

confidence: 99%

Selective Determination of Total Capsaicinoids in Plant Material Using Poly(Gallic Acid)‐modified Electrode

et al. 2018

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Novel voltammetric approach for the selective determination of total capsaicinoids has been developed using glassy carbon electrode modified with multi‐walled carbon nanotubes and poly(gallic acid) (PGA/MWNT/GCE). The modified electrode provides significant improvements in the capsaicinoids voltammetric characteristics in comparison to GCE and MWNT/GCE. The electrooxidation of capsaicinoids is irreversible adsorption‐controlled process with the anodic transfer coefficient of 0.49–0.53 and heterogeneous electron transfer rate constant of 1300–2400 s−1. The analytical ranges of 0.010–1.0 and 1.0–50 μM for capsaicin, 0.025–0.75 and 0.75–75 μM for dihydrocapsaicin and 0.025–5.0 and 5.0–75 μM for nonivamide with the detection limits of 2.9, 5.9 and 6.1 nM, respectively, have been obtained using differential pulse voltammetry (DPV). The selectivity of the capsaicinoids quantification in the presence of ascorbic acid, α‐tocopherol and carotenoids is shown. The method has been tested on the samples of red hot pepper spices and Capsicum annuum L. tinctures. The results correspond to the chromatographic data.

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Guaicolic spices curcumin and capsaicin electrochemical oxidation behaviour at a glassy carbon electrode

Cited by 44 publications

References 30 publications

A Newly Developed Electrocatalytic Oxidation and Voltammetric Determination of Curcumin at the Surface of PdNp-graphite Electrode by an Aqueous Solution Process with Al3+

A Newly Developed Electrocatalytic Oxidation and Voltammetric Determination of Curcumin at the Surface of PdNp-graphite Electrode by an Aqueous Solution Process with Al3+

Electrochemical behavior and determination of major phenolic antioxidants in selected coffee samples

Selective Determination of Total Capsaicinoids in Plant Material Using Poly(Gallic Acid)‐modified Electrode

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