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Sales, M G F; Castanheira, M S A; Ferreira, R M S; Vaz, Mário; Delerue-Matos, C

doi:10.4152/pea.200801147

Port. Electrochim. Acta

2007

DOI: 10.4152/pea.200801147

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M G F Sales¹,

M S A Castanheira²,

R M S Ferreira³

et al.

Abstract: Simple, rapid and precise amperometric methods for quantification of ascorbic acid (AA) are presented. Glassy carbon (GC), carbon paste (CP) and modified carbon paste (MCP) electrodes are used for this purpose. MCP electrodes are of CP with 10 % vanadate (V). All electrodes are inserted in a wall-jet device with an Ag/AgCl reference electrode and a platinum auxiliary electrode. This device is coupled to a flow injection analysis (FIA) set-up. Hydrodynamic and amperometric parameters are optimized unvaryingly. … Show more

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Cited by 3 publications

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“…18 Ammonium metavanadate was used as a mediator for ascorbic acid determination. 19 Vinpocetine, (3α,16α)-eburnamenine-14-carboxylic acid ethyl ester, is a derivative alkaloid of vincamine (Fig. 1).…”

mentioning

confidence: 99%

Electrochemical Behavior of Vinpocetine at Carbon Paste Electrodes Modified with Calixarenes

Варченко¹,

Bryleva²,

Беликов³

et al. 2014

J. Electrochem. Soc.

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Electrochemical behavior of vinpocetine at a plain carbon paste electrode and paste electrodes modified with different calixarenes and ammonium metavanadate was studied by means of cyclic and differential pulse voltammetry. The effect of pH and scan rate on the response at both plain and modified carbon paste electrodes has been revealed. Modification of an electrode with a mixture of ammonium metavanadate and some calixarenes led to considerable decrease of background current along with sensitivity increase as compared to an unmodified carbon paste electrode or an electrode modified with calixarenes only. For the most effective electrode composition, the linear working range was shown to be 2 . 10 −8 -6 . 10 −6 M with a detection limit of 5 . 10 −9 M.

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mentioning

confidence: 99%

Electrochemical Behavior of Vinpocetine at Carbon Paste Electrodes Modified with Calixarenes

Варченко¹,

Bryleva²,

Беликов³

et al. 2014

J. Electrochem. Soc.

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A Simple Flow Injection System for Amperometric Detection of Ascorbic Acid Using Carbon Paste/Copper Schiff Base Composite Electrode

Kulizić,

Stanković,

Rašić

et al. 2023

ChemistrySelect

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In this paper, a simple, sensitive, and precise flow injection system was optimized and applied to ascorbic acid determination with a carbon paste electrode modified with the Schiff base copper complex. The modified sensor showed increased sensitivity toward ascorbic acid oxidation with a decrease of oxidation potential by 200 mV. Under optimized flow parameters, working potential, gasket thickness, sample and reaction coil volumes, and flow rate, the developed flow system gave a linear response from 5 to 75 μmol/L of ascorbic acid. The calculated limit of detection was 4.5 μmol/L, calculated as 3σ/s which corresponds to the absolute value of 40 ng for the 50 μL sample coil. The precision for six consecutive injections of 5 and 75 μmol/L ascorbic acid solutions was determined as a relative standard deviation of 5.8 % and 1.5 %, respectively. The flow injection system enabled up to 120 analyses per hour. An optimized flow system was applied to the determination of ascorbic acid in dietary supplements, after simple preparation.

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Disposable Stochastic Dot Sensors for the Assay of Ascorbic Acid in Pharmaceutical Samples, Beverages, and Biological Fluids

Staden

Balasoiu

2011

Analytical Letters

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Eight disposable stochastic dot sensors based on porphyrins and modified diamond or carbon pastes were employed for the assay of ascorbic acid in pharmaceutical, beverages, and biological samples. The advantage of using such sensors for the assay of ascorbic acid is the possibility of qualitative and quantitative assay of ascorbic acid in one run of the experiment. The covered linear concentration range for these sensors was between 10 À14 and 10 À5 mol/L with high sensitivities. The proposed dot sensors were used reliably (RSD < 1%) for the assay of ascorbic acid from different samples for more than 6 months, with a recovery higher than 92.00%.

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Keywords Index

Cited by 3 publications

References 25 publications

Electrochemical Behavior of Vinpocetine at Carbon Paste Electrodes Modified with Calixarenes

Electrochemical Behavior of Vinpocetine at Carbon Paste Electrodes Modified with Calixarenes

A Simple Flow Injection System for Amperometric Detection of Ascorbic Acid Using Carbon Paste/Copper Schiff Base Composite Electrode

Disposable Stochastic Dot Sensors for the Assay of Ascorbic Acid in Pharmaceutical Samples, Beverages, and Biological Fluids

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