Bismuth film random array carbon fiber microelectrodes for determination of cysteine and N-acetyl cysteine

Brinić, Slobodan; Vladislavić, Nives; Buzuk, Marijo; Bralić, Marija; Šolić, Mislav

doi:10.1016/j.jelechem.2013.07.031

Cited by 17 publications

(13 citation statements)

References 47 publications

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“…[18] In addition to voltammograms recorded at pH 3.5 and 4.5, voltammogram recorded at pH 5.5 show increase of oxidation current, probably owning to improved dissolution of the bismuth film. [33] Although higher cathodic current can be observed at pH 5.5, the reduction signal attributed to cathodic reduction of FA is more pronounced at pH 4.5. Thus, for optimum pH value 4.5 was chosen.…”

Section: Electrochemical Behavior Of Fa At Prepared Bifesmentioning

confidence: 96%

“…[33,40] SWCS voltammograms (not shown), in the presence of these thiols, exhibit wider, less defined reduction peak, obviously as a consequence of simultaneous reduction of presented species on BiFE. However, this can be prevented by manipulation of accumulation time and accumulation potential of FA.…”

Section: Optimization Of Swcsv Procedures and Quantitative Utilitymentioning

confidence: 98%

“…[45,33] However, this will not take effect on analytical capabilities since these ranges are well defined and reproducible, although some authors [46] suggest employing of shorter accumulation time at higher analyte concentrations.…”

Section: Optimization Of Swcsv Procedures and Quantitative Utilitymentioning

confidence: 99%

“…By using of an "environmentally friendly" electrode material -bismuth (mostly as electrodeposited bismuth film as it is well known resemblance in electrochemical behavior between Bi and Hg) in electrochemical "stripping" analysis, [20,21,22] it is possible to overcome issues related to mercury based materials. Although conventional and micro bismuth film electrodes have been widely used in electrochemical analysis of various organic compounds [23][24][25][26][27][28][29][30][31][32][33][34][35][36][37] their relevance for folic acid determination has been very poorly exploited. Only Ananthi et al [38] reported determination of folic acid using glassy carbon electrode modified with an electrodeposited bismuth nanowires by square wave voltammetry.…”

Section: Introductionmentioning

confidence: 99%

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Sensitive Electrochemical Determination of Folic Acid Using ex–situ Prepared Bismuth Film Electrodes

et al. 2017

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The electrochemical behavior of folic acid (FA), at the electrochemically prepared ex situ bismuth film (BiF) on glassy carbon electrode, clearly indicates electrocatalytic nature of the prepared film toward FA reduction (at -0.55 V). Scanning electron microscopy is used for morphological characterization of the prepared BiF. Accordingly, we establishing an electrochemical procedure based on square wave cathodic stripping voltammetry, preceded by accumulation of FA on the BiF electrode (BiFE). This analytical method is optimized and its analytical performance is presented. This electrode displays a two linear response range: 0.1 to 1.0 μmol L -1 and 1.0-10.0 μmol L -1 with sensitivity of 20.10 μA μmol -1 L and 2.28 μA μmol -1 L, respectively. Developed method was validated in compliance with spectrophotometric method. Excellent recovery and standard deviation obtained with BiFE revealed great analytical potential of the proposed method which was applied for the determination of FA in pharmaceuticals formulation.

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Section: Electrochemical Behavior Of Fa At Prepared Bifesmentioning

confidence: 96%

Section: Optimization Of Swcsv Procedures and Quantitative Utilitymentioning

confidence: 98%

Section: Optimization Of Swcsv Procedures and Quantitative Utilitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Sensitive Electrochemical Determination of Folic Acid Using ex–situ Prepared Bismuth Film Electrodes

et al. 2017

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“…Bismuth electrodes have been used for voltammetry since 2000 . There are different types of bismuth electrodes, e. g. in situ and ex situ prepared bismuth‐film electrodes (BiFEs) which can be preplated on carbon , glassy carbon , carbon fibres , carbon paste , graphite , gold , and platinum . BiFEs have been used for the determination of various trace metals due to low toxicity, wide cathodic potential window, low noise, well defined and reproducible signals and simple and inexpensive preparation .…”

Section: Introductionmentioning

confidence: 99%

Differential Pulse Voltammetric Determination of 2‐Methyl‐4,6‐Dinitrophenol using Bismuth Bulk Electrode

et al. 2019

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This work reports the application of bismuth bulk electrode (BiBE) for the determination of 2‐methyl‐4,6‐dinitrophenol (MDNP) by differential pulse voltammetry (DPV) in Britton‐Robinson buffer of pH 12.0 as an optimal medium. BiBE was prepared by transferring molten bismuth into a glass tube under constant stream of nitrogen. The linear concentration dependences were measured from 1 to 10 μmol ⋅ L−1 and from 10 to 100 μmol ⋅ L−1 by using optimum accumulation potential of −0.7 V and optimum accumulation time 30 s. Under these conditions limit of determination and limit of quantification was 0.45 and 1.5 μmol ⋅ L−1, respectively. The developed method was successfully applied for the analysis of tap water as a model sample.

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Modulated Ionomer Distribution in the Catalyst Layer of Polymer Electrolyte Membrane Fuel Cells for High Temperature Operation

Choo¹,

Oh²,

Kim³

et al. 2014

ChemSusChem

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Ionomer distribution is an important design parameter for high performance polymer electrolyte membrane fuel cells (PEMFCs); however, the nano-scale modulation of the ionomer morphology has not been intensively explored. Here, we propose a new route to modulate the ionomer distribution that features the introduction of poly(ethylene glycol) (PEG) to the cathode catalyst layer and the leaching the PEG phase from the catalyst layer using a water effluent during operation. The key concept in the approach is the expansion of the ionomer thin film through the PEG addition. We demonstrate that the modulated ionomer distribution increases the electrochemical active area and proton transport property, without loss in oxygen transport, at a fixed ionomer content. At a high temperature of 120 °C, the power performance at 0.6 V is increased by 1.73-fold with the modulated ionomer distribution as a result of 1.25-fold increase in the electrochemical active area and two-fold increase in the proton transport rate in the catalyst layer.

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Bismuth film random array carbon fiber microelectrodes for determination of cysteine and N-acetyl cysteine

Cited by 17 publications

References 47 publications

Sensitive Electrochemical Determination of Folic Acid Using ex–situ Prepared Bismuth Film Electrodes

Sensitive Electrochemical Determination of Folic Acid Using ex–situ Prepared Bismuth Film Electrodes

Differential Pulse Voltammetric Determination of 2‐Methyl‐4,6‐Dinitrophenol using Bismuth Bulk Electrode

Modulated Ionomer Distribution in the Catalyst Layer of Polymer Electrolyte Membrane Fuel Cells for High Temperature Operation

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