Behavior of riboflavin on plain carbon paste and aza macrocycles based chemically modified electrodes

Kotkar, Rahul M.; Desai, Purvi B.; Srivastava, Ashwini K.

doi:10.1016/j.snb.2006.12.004

Cited by 55 publications

(20 citation statements)

References 37 publications

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“…Reaction is as follows: 濛濚 H 2 ASc + Ni (II) In recent years, particular attention has been paid to studies on the complexation of important bioelements with biologically active ligands [8,9] . The presence of the dienol group in the molecule of the L-ascorbic acid may be the reason for possible complexation of the compounds with metal ions [10] .…”

Section: Discussionmentioning

confidence: 99%

Alteration of chemical behavior of L–ascorbic acid in combination with nickel sulfate at different pH solutions in vitro

Maniyar¹,

Jargar²,

Das³

et al. 2012

Asian Pacific Journal of Tropical Biomedicine

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Section: Discussionmentioning

confidence: 99%

Alteration of chemical behavior of L–ascorbic acid in combination with nickel sulfate at different pH solutions in vitro

Maniyar¹,

Jargar²,

Das³

et al. 2012

Asian Pacific Journal of Tropical Biomedicine

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“…As it was mentioned earlier, no established electrochemical method for riboflavin determination by using chronopotentiometry has been published to date in literature. Concerning the sensitivity of riboflavin determination, it is evident that various types of modified electrodes 2,22,28 provide the lowest LOD. Beside surface modification, an additional contribution to sensitivity increase is achieved by pre-concentration step (stripping techniques).…”

Section: Comparison With Other Electrochemical Methodsmentioning

confidence: 99%

“…Although riboflavin is found distributed in virtually all naturally occurring foods, especially rich sources of this vitamin are milk and dairy products, meat, eggs, livers, cereals and fresh leafy vegetables. [1][2][3] Regular daily intake of riboflavin is important because it is not stored in human body in appreciable amounts. Though no pathologically severe symptoms attributed to vitamin B 2 deficiency have been observed in humans, diets lacking the vitamin caused lesions of the muco-cutaneous surfaces and intense photophobia.…”

Section: Introductionmentioning

confidence: 99%

“…18,19 Among electrochemical methods, those based on voltammetry and voltammetric stripping analysis are mostly used for riboflavin assays. 1,[18][19][20][21][22] Various types of electrodes were considered in analysis of riboflavin, including mercury electrodes, 22,23 gold electrode, 18 different types of carbon paste electrode, 2,22,24 glassy carbon electrodes, 25,26 and bismuth based electrodes. 27,28 Most of the mentioned electrodes are complicated to prepare, often with low reproducibility of fabrication.…”

Section: Introductionmentioning

confidence: 99%

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Simple, Rapid and Selective Chronopotentiometric Method for the Determination of Riboflavin in Pharmaceutical Preparations Using a Glassy Carbon Electrode

Brezo

Stojanović

Suturović

et al. 2015

ACSi

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A novel, simple, sensitive and reliable electrochemical method for the riboflavin determination using chronopotentiometry with glassy carbon electrode was developed. The most important instrumental parameters of chronopotentiometry including type and concentration of supporting electrolyte, initial potential and current range were examined and optimised in respect to riboflavin analytical signal. Riboflavin provided well defined reduction signal at -0.12 V vs. Ag/AgCl (3.5 mol/L KCl) electrode in 0.025 mol/L HCl. Under optimal conditions, linear response of riboflavin was observed in the concentration range of 0.2-70 mg/L with achieved limit of detection of 0.076 mg/L and limit of quantitation of 0.23 mg/L of riboflavin. Common vitamins and excipients did not interfere with the determination. The proposed method was successfully applied for determination of riboflavin in commercially available pharmaceutical preparations. The obtained results were in statistical agreement to the contents declared by manufacturer and to those obtained by HPLC used as a comparative method.

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“…The surface of carbon can be modified by mechanical [4][5][6], electrochemical [7][8][9][10][11][12][13][14], chemical [14][15][16][17][18][19][20][21] or thermal [22] means. There are typically three different levels of surface modification: alteration of the functionalities already present on the surface; the covalent attachment of hitherto exogenous species onto the electrode surface and, in the last level, the intercalation of species between the graphene layers of the base substrate.…”

Section: Introductionmentioning

confidence: 99%

Laser-anodised carbon fibre: Coupled activation and patterning of sensor substrates

Ezekiel¹,

Sharp²,

Villalba³

et al. 2008

Journal of Physics and Chemistry of Solids

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting galley proof before it is published in its final citable form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.A c c e p t e d m a n u s c r i p t The oxidation increases the proportion of oxygen species such as hydroxyl, carbonyl, carboxyl and quinones at the electrode surface [14]. These are well known to influence the wettability, surface reactivity, porosity and conductivity of the electrode [1,7,8,10]. It can also have the beneficial effect of increasing the availability of edge sites as a consequence of exfoliation / fracturing process that can, as with eppg electrodes, serve to increase electrode sensitivity towards particular analytes.Laser patterning of carbon encapsulated composites have been shown to provide a quick and versatile method of producing electrode sensor assemblies but the ability of the laser to positively influence the surface characteristics of the underlying fibre has yet to be evaluated. The adoption of the electrochemical anodisation A c c e p t e d m a n u s c r i p t H.B Ezekiel et al Nottingham Trent University May 20083 approach requires the introduction of a separate/discrete step in the construction of the electrode sensor and it is clear that combining the patterning/activation process would represent a considerable simplification in the development process. In the present investigation, the use of laser ablation as a means of removing protective polymer encapsulants to expose and activate the sensor surface in a single step is assessed. Experimental DetailsElectrochemical measurements were conducted using a µAutolab type III computer controlled potentiostat (Eco-Chemie, Utrecht, The Netherlands) using a three electrode configuration consisting of a glassy carbon working electrode (3mm diameter, BAS Technicol, UK), a platinum wire counter electrode and a 3 M NaCl Ag Electrochemical anodisation of carbon fibres was conducted using the procedures described previously [23,24] and typically involved amperometric oxidation (+2V, 15 minutes) in 0.1M sodium hydroxide solution. Results and DiscussionCarbon fibres were encapsulated within a polyester resin laminate as described in previous work by the authors [23,24]. An electrode window was then created by rastering the laser across a pre-selected area of the polymer-fibre composite. This has the effect of removing the polymer and exposing the fibre which can, in principle, be 4 kinetics at a substrate that is largely basal plane in structure. The voltammogram recorded at the anodised fibre, in contrast, displays a well defined and easily quantifiable oxidation process. The change in profile is dramatic but is in keeping with previous work where electrochemical anodisation...

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Behavior of riboflavin on plain carbon paste and aza macrocycles based chemically modified electrodes

Cited by 55 publications

References 37 publications

Alteration of chemical behavior of L–ascorbic acid in combination with nickel sulfate at different pH solutions in vitro

Alteration of chemical behavior of L–ascorbic acid in combination with nickel sulfate at different pH solutions in vitro

Simple, Rapid and Selective Chronopotentiometric Method for the Determination of Riboflavin in Pharmaceutical Preparations Using a Glassy Carbon Electrode

Laser-anodised carbon fibre: Coupled activation and patterning of sensor substrates

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