Electrochemical behavior of quercetin: Experimental and theoretical studies

Zare, Hamid R.; Namazian, Mansoor; Nasirizadeh, Navid

doi:10.1016/j.jelechem.2005.07.005

Cited by 116 publications

(78 citation statements)

References 35 publications

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“…6(C)) performed at pH 4; this is in agreement with published literature on quercetin peak potential versus pH. [26,27] In Fig. 7, the oxidation peak intensity decreases gradually as quercetin concentration decreases from 10 −5 to 10 −9 .…”

Section: Electrochemical Detection Of Quercetin At Au-mipsupporting

confidence: 89%

Aryl diazonium salt surface chemistry and ATRP for the preparation of molecularly imprinted polymer grafts on gold substrates

Gam‐Derouich

Nguyen

Madani

et al. 2010

Surface & Interface Analysis

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Quercetin-imprinted poly(vinyl pyridine-co-ethylene glycol dimethacrylate) cross-linked grafts were prepared by atom transfer radical polymerization (ATRP) using aryl modified gold substrates as macroinitiators. The aryl layers were first attached to Au by electrochemical reduction of the diazonium salt BF The changes in the surface chemical composition, from the neat Au to Au-MIP and Au-NIP, were monitored by XPS and polarization modulation infrared reflection-absorption spectroscopy (PM-IRRAS). Cyclic voltammetry (CV) was used to assess the specificity and selectivity of Au-MIP to detect quercetin. The detection limit was found to be better than 10 −6 mol/l with CV.

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Section: Electrochemical Detection Of Quercetin At Au-mipsupporting

confidence: 89%

Aryl diazonium salt surface chemistry and ATRP for the preparation of molecularly imprinted polymer grafts on gold substrates

Gam‐Derouich

Nguyen

Madani

et al. 2010

Surface & Interface Analysis

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“…Figure 1 shows the CVs of 20 mmol L À1 pomiferin and osajin, in pH 7.1 hydroalcoholic solution at a scan rate 25 mV s À1 . As expected for phenolic compounds with two adjacent hydroxyl groups in B-ring (the well known catechol group), the overall CV profile of pomiferin is similar to the CVs reported for other flavonoids, such as catechin [29], quercetin [30], rutin [31] and morin [32]. As in these cases, the CV shows a couple of anodic and cathodic peaks at lower positive potentials and an anodic response at higher potentials, with no cathodic counterpart.…”

Section: Electrochemical Behavior Of Pomiferin Versus Osajinsupporting

confidence: 80%

“…The mechanism of action as antioxidant seems to involve the ability of the polyphenol to scavenge radicals by electron transfer processes. There are several references of the pH dependence of these processes [29,30,34,36,38], and some information on the mechanism of polyphenol oxidation can be provided by comparing oxidation potentials at different pH values. The influence of pH on electrochemical behavior of pomiferin (20 mmol L À1 ), over the whole potential range studied and using the scan rate of 25 mV s…”

Section: Influence Of Ph On Electrochemical Behavior Of Pomiferinmentioning

confidence: 99%

Electrochemical Characterization and Quantification of the Strong Antioxidant and Antitumor Agent Pomiferin

2009

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The electrochemical behavior of pomiferin, a natural isoflavone with significant antioxidant, antidiabetic and antitumor properties, is reported here for the first time at a glassy carbon electrode (GCE). In order to understand the redox processes of this compound, its response was compared with the nonantioxidant isoflavone osajin. Based on cyclic and square-wave voltammetric methods it was observed that pomiferin presents a quasireversible anodic peak, which was attributed to the oxidation of the catechol group, and that is strongly influenced by pH. This anodic process yields a well-defined DPV response, which can be used for the analytical determination of this potential pharmotherapeutic isoflavone.

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“…That is based on the equation of 0.0592(h/n) V/pH, where h and n are the number of protons and electrons involved in the electrode process [23].This is in accordance with literature data about mechanistic scheme of some catechol groups compounds to changed hydroxyl group to quinon group [24]. For analytical purposes, the medium chosen to carry out further studies was the 0.05 mol l-1 acetate buffer solution at pH 7.0.…”

Section: Effect Of Phsupporting

confidence: 84%

A dysprosium nanowire modified carbon paste electrode for determination of levodopa using fast Fourier transformation square-wave voltammetry method

Daneshgar

Norouzi

Ganjali

et al. 2009

Colloids and Surfaces B: Biointerfaces

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A new detection technique called the fast Fourier transform square-wave voltammetry (FFT SWV) is based on measurements of electrode admittance as a function of potential. The response of the detector (microelectrode) is fast, which makes the method suitable for most applications involving flowing electrolytes. The carbon paste electrode was modified by nanostructures to improve better sensivity. The redox property of Diphenhydramin was used for determination of it in human serum and urine samples. Synthesized dysprosium nanowires make more effective surface like nanotubes [1-4] so they are good candidates for using as a modifier for electrochemical reactions. The drug presented one irreversible oxidation peaks at 1080mV vs. Ag/ AgCl by modified Nanowire carbon paste electrode which produced high current and reduced the oxidation potential about 300mV. Furthermore, signalto-noise ratio has significantly increased by application of discrete fast Fourier Transform (FFT) method, background subtraction and two-dimensional integration of the electrode response over a selected potential range and time window. To obtain the much sensivity the effective parameters such as frequency, amplitude and pH was optimized. As a result, LOD of 4.0 ×10-11 mol l -1 and an LOQ of 8.0× 10 -11 mol l -1 were found for determination for Diphenhydramin. A good recovery was obtained for assay spiked urine samples and a good quantification of Diphenhydramin was achieved in a commercial formulation.

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Electrochemical behavior of quercetin: Experimental and theoretical studies

Cited by 116 publications

References 35 publications

Aryl diazonium salt surface chemistry and ATRP for the preparation of molecularly imprinted polymer grafts on gold substrates

Aryl diazonium salt surface chemistry and ATRP for the preparation of molecularly imprinted polymer grafts on gold substrates

Electrochemical Characterization and Quantification of the Strong Antioxidant and Antitumor Agent Pomiferin

A dysprosium nanowire modified carbon paste electrode for determination of levodopa using fast Fourier transformation square-wave voltammetry method

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