Highly selective and sensitive voltammetric sensor for captopril determination based on modified multiwall carbon nanotubes paste electrode

Ensafi, Ali A.; Rezaei, Behzad; Mirahmadi-Zare, Zohre; Karimi-Maleh, Hassan

doi:10.1590/s0103-50532011000700017

Cited by 39 publications

(13 citation statements)

References 23 publications

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“…Several studies highlight the use of modified electrodes for the oxidation of captopril, including carbon paste modified with p ‐aminophenol , biomimetic electrochemical sensor based on the bis (pyridyl)iron phthalocyanine (II) complex sensor based on graphene nanocomposite modified with cobalt hexacyanoferrate (II) , platinum electrode modified with iron (III) hexacyanoferrate (II) and others. Up to our knowledge, there is no record of work using ruthenium (III) hexacyanoferrate as a modifier of a glassy carbon electrode surface for determination of captopril.…”

Section: Introductionmentioning

confidence: 99%

Ruthenium Hexacyanoferrate (III) Modified Glassy Carbon Electrode for Determination of Captopril

et al. 2016

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A glassy carbon electrode modified with a ruthenium (III) hexacyanoferrate film was investigated for the determination of captopril in pharmaceutical formulations. The RuOHCF film was deposited on the surface of the electrode after applying 50 successive cycles and subsequent stabilization in a mixture of NaNO3 0.50 mol L−1+HCl 0.050 mol L−1 used as supporting electrolyte. The main processes responsible for the redox electrode response are attributed to the system RuII/RuIII/RuIV, and appeared at −0.080, 0.86 and 1.01 V (vs. SCE). The redox process at −0.080 V was selected for the determination of captopril in the present study, once it provided higher sensibility and occurs in a lower potential than the other ones which can prevent interferences. The experimental parameters used in the determination of the analyte, using differential pulse voltammetry were optimized: pulse amplitude: 50 mV, scan rate: 5 mV s−1 and potential window: −0.5 to 0.2 V (vs. SCE). The analytical application of the sensor in real samples demonstrated a linear range between 0.060 and 0.80 µmol L−1 (r=0.998) with a detection limit of 0.047 µmol L−1. A mechanism based on co‐precipitation of captopril and the Ru (III) complex in the film is presented once the signal of the RuII/III redox couple decreases with increasing the analyte concentration. Recoveries of 99 to 100 % were achieved in pharmaceutical samples and the proposed procedure agreed with the HPLC official method within 95 % confidence level, according to the t‐Student test.

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Section: Introductionmentioning

confidence: 99%

Ruthenium Hexacyanoferrate (III) Modified Glassy Carbon Electrode for Determination of Captopril

et al. 2016

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“…Plotting the anodic peak current (inflection point current) against square root of the scan rate shows a linear correlation (see Fig. 11), which indicates that the electrochemical process is limited by the rate of diffusion 54 .…”

Section: Structure Of Carbon Nanosheetsmentioning

confidence: 94%

Comparison of acid exfoliators in carbon nanosheets synthesis from stinging nettle (Urtica dioica) for electrochemical applications

Nuilek

Wongwiriyapan

Sattayarut

et al. 2020

Sci Rep

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Carbon nanosheets (CNs) were successfully synthesized from nettle stem (NS) which is an inexpensive material with a high carbon content that is abundantly available in nature. CNs were produced using chemical (potassium hydroxide activation and acid exfoliation) and thermal treatments. Sulfuric (H2SO4), phosphoric (H3PO4) and nitric (HNO3) acid solutions were used for exfoliation. CNs exfoliated by H3PO4 have higher specific surface area (789 m2 g−1) compared to CNs exfoliated by H2SO4 (705 m2 g−1) and HNO3 (106 m2 g−1). In this work, NSCNs were found to be a potential candidate for electrode material in electrochemical capacitors. The maximum specific capacitance of the NSCNs exfoliated by H3PO4 is found to be 27.3 F g−1 at a current density of 0.05 A g−1, while the specific capacitance of NSCNs exfoliated by H2SO4 and HNO3 is 9.34 F g−1 and 1.71 F g−1, respectively. Energy density (0.06–0.95 Wh kg−1) and power density (20.9–26.7 W kg−1) of NSCNs are confirmed to be supercapacitor materials and can be applied in energy storage devices.

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“…However, among the various methods reported for CP detection, electrochemical techniques are often preferred because of their low cost, high selectivity, rapid detection and their lack of a substantial sample preparation setup [14][15][16][17]. The comparisons of the proposed method for CP determination with the other electrochemical published papers are given in Table 1 [18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Preparation of a manganese titanate nanosensor: Application in electrochemical studies of captopril in the presence of para-aminobenzoic acid

Ghoreishi

Karamali

Khoobi

et al. 2015

Analytical Biochemistry

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Highly selective and sensitive voltammetric sensor for captopril determination based on modified multiwall carbon nanotubes paste electrode

Cited by 39 publications

References 23 publications

Ruthenium Hexacyanoferrate (III) Modified Glassy Carbon Electrode for Determination of Captopril

Ruthenium Hexacyanoferrate (III) Modified Glassy Carbon Electrode for Determination of Captopril

Comparison of acid exfoliators in carbon nanosheets synthesis from stinging nettle (Urtica dioica) for electrochemical applications

Preparation of a manganese titanate nanosensor: Application in electrochemical studies of captopril in the presence of para-aminobenzoic acid

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