The characterization of 5-{[4-(4-mercapto)phenylmethoxy]phenyl}-10,15,20-tris(phenyl)porphyrin cobalt(II) self-assembled monolayers (SAMs) and its electrocatalytic oxidation for ascorbic acid

Lu, Xiaoquan; Jin, Jun; Kang, Jingwan; Lv, Baoqiang; Liu, Hongde; Geng, Zhi‐Yuan

doi:10.1016/s0254-0584(02)00221-3

Cited by 16 publications

(8 citation statements)

References 14 publications

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“…20 It has also been used for the determinations of UA or AA. 21,22 However, a major problem is, at substrate electrodes, that the anodic peak potentials for AA and UA are almost the same, 3,23 which results in overlapped current responses, and makes their discrimination very difficult. Thus, the discrimination of the co-existence of UA and AA is a problem of critical importance in the field of biomedical chemistry.…”

mentioning

confidence: 99%

Simultaneous Electrochemical Determination of Uric Acid and Ascorbic Acid on a Glassy Carbon Electrode Modified with Cobalt(II) Tetrakisphenylporphyrin

Zeng

Liu

et al. 2006

ANAL. SCI.

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confidence: 99%

Simultaneous Electrochemical Determination of Uric Acid and Ascorbic Acid on a Glassy Carbon Electrode Modified with Cobalt(II) Tetrakisphenylporphyrin

Zeng

Liu

et al. 2006

ANAL. SCI.

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“…All of these are typical characteristics of an electrochemical catalytic oxidation process, so it is obvious that Fe III TMPyP-Nb 3 O 8 facilitates the electron transfer for the reduction of AA. The observed I pa is larger than the reported self-assembled monolayer of MPPTPCo(II)-modified Au electrode [50]; we ascribe this to the unique layer structure of the Fe III TMPyP-Nb 3 O 8 hybrid, the inclined monolayer arrangement of iron porphyrin in the hybrid makes it a potential electrocatalyst in detection of AA.…”

Section: Electrochemical Characterization Of the Fe III Tmpyp-nb 3 O mentioning

confidence: 61%

“…Here, the Fe III TMPyP-Nb 3 O 8 nanocomposite is a successful example of immobilization of iron porphyrin on the electrode, and its electrochemical amplification of the current response of AA makes it a promising material for fabricating biosensors. The electrocatalytic activities is comparable to electropolymerized porphyrin [61], porphyrin-SAM [50], or porphyrin-MWCNT [11] modified electrode; its quick reaction with AA makes it an ideal material for detecting AA as well as other bioactive species.…”

Section: Electrochemical Characterization Of the Fe III Tmpyp-nb 3 O mentioning

confidence: 95%

“…On the basis of the above investigations on the electorchemical oxidation of AA at Fe III TMPyP-Nb 3 O 8 /GCE, we propose the catalytic mechanism of oxidation of AA on Fe III TMPyP-Nb 3 O 8 /GCE as follows [50,54,56]:…”

Section: Electrochemical Characterization Of the Fe III Tmpyp-nb 3 O mentioning

confidence: 96%

“…Ascorbic acid has two acid protons (named H 2 A); its oxidation at below pH 8 undergoes two successive oneelectron oxidation steps accompanied by rapid dehydration, which makes the oxidation process irreversible [1,50,[53][54][55]. On the basis of the above investigations on the electorchemical oxidation of AA at Fe III TMPyP-Nb 3 O 8 /GCE, we propose the catalytic mechanism of oxidation of AA on Fe III TMPyP-Nb 3 O 8 /GCE as follows [50,54,56]:…”

Section: Electrochemical Characterization Of the Fe III Tmpyp-nb 3 O mentioning

confidence: 97%

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Electrochemical investigation of a novel metalloporphyrin intercalated layered niobate modified electrode and its electrocatalysis on ascorbic acid

Zhang

Wang

et al. 2013

J Solid State Electrochem

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Cationic iron (III) tetrakis-5, 10, 15, 20-(N-methyl-4-pyridyl) porphyrin (Fe III TMPyP) was intercalated into layered semiconductor KNb 3 O 8 by ion-exchange method. The target product was characterized by XRD, Fourier transform infrared, UV-vis, and TGA. Fe III TMPyP forms an inclined monolayer between Nb 3 O 8 − nanosheets and endues the nanocomposite with excellent electrochemical catalytic activities. The target nanocomposite modified glass carbon electrode shows good electrocatalytic activities for the oxidation of ascorbic acid (AA); the catalytic mechanism was proposed. Differential pulse voltammetric technique was used for detection of AA in neutral aqueous solution; a detection limit of 4.2×10 −5 M was obtained, and the modified electrode showed good reproducibility in electrochemical detection.

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Electrocatalytic Determination of Vitamin C Using Calixarene Modified Carbon Paste Electrodes

Ijeri¹,

Algarra²,

Martins³

2004

Electroanalysis

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Effect of in situ complexation of some ions with variable valencies, like Co(II), Ni(II), Mn(II), Cu(II) and Pb(II) on the the electrooxidation of Vitamin C (l-ascorbic acid) was studied by cyclic voltammetry using carbon paste electrodes modified with p-tert-butylcalix [4]arene and p-tert-butylcalix [6]arene in perchloric acid, acetic acid and ammonium acetate media. Pb(II) was found to bind strongly with p-tert-butylcalix[4]arene in acetate medium, resulting in its being retained at the electrode surface and catalyzing the oxidation of ascorbic acid. The overpotential was reduced by about 200 mV with an increase in the peak currents. Linearity was observed over the range of 0.07 -400 ppm with a detection limit of 30 ppb by differential pulse voltammetry. Interferences of some common substances like sugars and amino acids were studied and the modified electrode was used for the determination of vitamin C in commercial samples.Keywords: Carbon paste electrode, Calixarene, Ascorbic acid, Voltammetry Vitamin C (l-ascorbic acid), a water-soluble vitamin that is widely required for metabolism and consumed on a large scale is electroactive and has been studied extensively [1 -4]. Several chemically modified electrodes (CMEs) have been fabricated, and ascorbic acid has been used as a model compound to study the effect of modification, which in-turn have led to a number of electrochemical sensors. CMEs based on enzymes [5 -7], polymerization [8 -13], dyes [14 -17], self assembled monolayers [18 -21], redox [22 -23] and macrocyclic complexes of transition metal ions are reported.Most of the macrocyclic complexes used as modifiers are phthalocyanines [24 -26], porphyrins [28 -29] or cyclam type of molecules [21,30,31]. However, to the best of our knowledge, there is no report on the utility of calixarenemetal ion complexes in electrocatalysis, though they have been used in a number of ion selective electrodes (ISEs) [32 -35] and CMEs [36 -40]. Therefore, we considered it interesting to study if the calixarene complexes exhibit similar electrocatalytic activity as the other macrocyclic compounds mentioned above. The calixarenes chosen were, p-tert-butylcalix[4]arene and p-tert-butylcalix[6]arene for their cavity radii are closer to the ionic radii of the commonly used transition metal ions which exhibit multiple valencies, viz. Co(II), Ni(II), Mn(II), Cu(II). Pb(II) was also included in our study as it is known to form stronger complexes [32,36] with calixarenes than the above mentioned ions, and in fact were found to be the only complexes which exhibited electrocatalytic behavior.A reaction at an electrode is said to be electrocatalytic if the oxidation/reduction potential is decreased considerably and if there is a simultaneous increase in peak currents. The oxidation of ascorbic acid (AA) was studied in 0.01 M perchloric acid (pH 2.0), 0.04 M acetic acid (pH 3) and ammonium acetate media (pH 5.1) containing Cu(II), Co(II), Ni(II), Mn(II) and Pb(II) ions using plain carbon paste electrodes (PCPEs) and modified...

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The characterization of 5-{[4-(4-mercapto)phenylmethoxy]phenyl}-10,15,20-tris(phenyl)porphyrin cobalt(II) self-assembled monolayers (SAMs) and its electrocatalytic oxidation for ascorbic acid

Cited by 16 publications

References 14 publications

Simultaneous Electrochemical Determination of Uric Acid and Ascorbic Acid on a Glassy Carbon Electrode Modified with Cobalt(II) Tetrakisphenylporphyrin

Simultaneous Electrochemical Determination of Uric Acid and Ascorbic Acid on a Glassy Carbon Electrode Modified with Cobalt(II) Tetrakisphenylporphyrin

Electrochemical investigation of a novel metalloporphyrin intercalated layered niobate modified electrode and its electrocatalysis on ascorbic acid

Electrocatalytic Determination of Vitamin C Using Calixarene Modified Carbon Paste Electrodes

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