Electrochemical study of methylene blue incorporated into mordenite type zeolite and its application for amperometric determination of ascorbic acid in real samples

Arvand, Majid; Sohrabnezhad, Sh.; Mousavi, Mir F.; Shamsipur, Mojtaba; Zanjanchi, Mohammad Ali

doi:10.1016/s0003-2670(03)00790-6

Cited by 101 publications

(41 citation statements)

References 41 publications

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“…In the case of electrolytes with a large hydrated cation radius such as Li + , the small current and charge passed during the redox process makes its diffusion through the polymer network more difficult. This was also observed at an electrode containing the MB dye monomer incorporated into a modernite type zeolite, in this case diffusion being through the zeolite pores [19]. For electrolytes containing Na + and K + as cations, no significant differences between the recorded peak currents were observed, even though their hydrated ionic radii are different.…”

Section: The Effect Of the Counter Ion Of The Supporting Electrolytementioning

confidence: 59%

“…In order to overcome this problem, many investigations have been focused on finding new electrode materials and ways to immobilize the organic dyes so that the formal potential is invariant with change in pH. Some studies have shown that when various phenoxazine and phenothiazine-type mediators are immobilized onto zirconium phosphate [17,18], or incorporated into modernite type zeolites [19], their E 0 values remain constant with pH.…”

Section: E-mail Address: Brett@ciucpt (Cma Brett)mentioning

confidence: 99%

“…It has been found that when phenazine dyes are in solution or chemically adsorbed at electrode surfaces, they possess a midpoint potential which is highly pH-dependent [32,33]. However, recent findings have shown that when various phenoxazine and phenothiazine-type mediators are immobilized onto zirconium phosphate [18] or onto zeolite [19], their formal potential values remain invariant with pH. It was therefore necessary to investigate the variation of midpoint potential with pH for the electropolymerised dyes, since this influences the applied potential at which the redox-mediated biosensors can be used.…”

Section: The Effect Of Solution Phmentioning

confidence: 99%

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Electrosynthesis and electrochemical characterisation of phenazine polymers for application in biosensors

Bârsan

Pinto

Brett

2008

Electrochimica Acta

105

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A comparative investigation has been undertaken of the electrosynthesis and electrochemical properties of three different electroactive polymers on carbon film electrode substrates: poly(neutral red) from the phenazine dye neutral red, and poly(methylene green) and poly(methylene blue), from the corresponding phenothiazine dyes. The formation of the radical cation at different potentials and the chemical structures of the monomers both influence the electropolymerisation process of the three polyaromatic dyes. Of the three, poly(neutral red) is shown to have the best adhesion at carbon film electrodes. The influence of the electrolyte and pH on film growth and on electrochemical properties was investigated. The formal potential decreased linearly with increase in pH, in the pH range from 1 to 7 for all three polymers. The modified electrodes were also characterised by electrochemical impedance spectroscopy. The bulk and interfacial characteristics of the two phenothiazine polymers were similar and oxygendependent, but different to those of the phenazine polymer, poly(neutral red), which were not significantly influenced by the presence of oxygen in solution. Perspectives for use in electrochemical biosensors are indicated.

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Section: The Effect Of the Counter Ion Of The Supporting Electrolytementioning

confidence: 59%

Section: E-mail Address: Brett@ciucpt (Cma Brett)mentioning

confidence: 99%

Section: The Effect Of Solution Phmentioning

confidence: 99%

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Electrosynthesis and electrochemical characterisation of phenazine polymers for application in biosensors

Bârsan

Pinto

Brett

2008

Electrochimica Acta

105

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“…These include titrimetric [12], [13], fluorometric [14], Flow Injection Photoamperometric [15], Flow electrochemical determination [16], direct injection liquid chromatography [17], high-performance liquid chromatography [18], spectrophotometric [19], [20], [21], [22], Photoelectrochemical [23], amperometric [24][25][26][27][28][29][30], Sonovoltammety [31], Electrocatalytic Determination [32][33][34][35][36][37], Electrochemical [38][39][40][41][42][43]. The vitamin C levels in some biological samples have been reported by several investigators.…”

Section: Electrochemistry Of Vitamin Cmentioning

confidence: 99%

A Comparative Study on Electrochemical Determination of Vitamin C in Liver and Tomato Using Platinum and Glassy Carbon Electrodes (Original Article)

Tadesse¹

2017

BMB

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Ascorbic acid, a water-soluble vitamin, is the most common electroactive biological compound found in most biological species. The electrochemical oxidation of vitamin C was investigated at GCE and Pt electrodes in various aqueous solutions in the pH range of 1 to 5 (0.1 M KCl as a supporting electrolyte) by CV and DPV. Experimental conditions, for CV: Scan rate of 50 mV/s, Initial potential -100 mV and Final Potential 1000 mV, for DPV: Scan Rate 50mV/s, Pulse amplitude 50mV,Pulse period 125 ms, Initial potential -100mV and Final Potential 1000 mV. For cyclic voltammetry, Regression equation of y=23.4611X + 13.2489 for GCE and y=5.19714X + 13.7071 Pt; LOD of 0.0035294 mM for GCE and 0.0176 mM for Pt; LOQ of 0.025519 mM for GCE and 0.085066 mMPt; R.S.D of % 2.76% for GCE and 4.42% for Pt. And for DPV Regression equation, y = 1.201X + 0.530393 for GCE andy = 0.0521393X + 0.506857 for Pt, R.S.D % 0.391% for GCE and 4.969% for Pt, LOD 0.12412 mM for GCE and 0.22497 mM for Pt and LOQ 0.4137 mM for GCEand 0.7499 mM for Pt. The oxidation peak potential of ascorbic acid were 270 mV and 370 mV for GCE in CV and DPV respectively but for Pt electrode 490 mV for CV and 370 mV for DPV (versus Ag/AgCl reference electrode). The influence of the operational parameters like scan rate, pulse amplitude, pulse period, concentration and pH on the analytical signal was investigated. The method developed by standard was applied to ascorbic acid assessment in liver and tomato samples. The results of ascorbic acid assessment by DPV were compared to those obtained by CV on both GCE and Pt electrodes.

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“…The reaction between AA and MB was used for AA determination in pharmaceuticals or fruit juices by using spectrophotometry, 19) amperometry 20,21) or voltammetry. 22) In this study, the determination of AA is based on the measurement of decreasing of the fluorescence intensity of MB due to the reaction between AA and MB, where MB is reduced to colorless LMB and AA is oxidized to dehydroascorbic acid (DHAA).…”

mentioning

confidence: 99%

Fluorimetric Determination of Ascorbic Acid in Vitamin C Tablets Using Methylene Blue

Dilgin

Nişli

2005

CHEMICAL & PHARMACEUTICAL BULLETIN

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Ascorbic acid (AA), also known as Vitamin C, is a watersoluble vitamin and needed for the growth and repair of tissues in all parts of the body. AA has vital importance in processes of oxidation and reduction in human organism participating of several metabolic reactions. AA has also been used for the prevention and treatment of the common cold, mental illness, infertility, cancer and AIDS.1) Due to the great importance of AA in human beings, the quantitative analysis of AA has gained increased significance in several areas of analytical chemistry such as pharmaceutical and food applications. It is also clinically important to determine its concentration in blood, urine and some tissues.Many methods depend on the reaction of AA by means of suitable reagents, then the product of reaction or excess reagent monitored with optically (spectrophotometric, [2][3][4] fluorimetric [5][6][7][8] or chemiluminimetric 9) ), electrochemically (amperometric, 10,11) voltammetric, 12,13) potentiometric 14) or conductometric 15) ) and chromatographically (High Pressure Liquid Chromatography 16,17) ). Spectrofluorimetric analysis is well known for its sensitivity and speed. Recently, fluorimetric determinations of AA have been developed based on the condensation reactions of AA with o-phenylenediamine 5) and on the oxidation with mercury(II) of vitamin C to form quinoxaline derivate.6) The reaction products of these methods exhibit fluorescence. A simple, sensitive and selected fluorimetry for determination of AA is based on the reaction of AA in alkaline medium with 2,3-diaminonaphthalene without oxidant.7) The addition of beta-cyclodextrin (beta-CD) was greatly enhancing the fluorescence of the system. In another study, 8) Thionine blue is reacted with AA in order to develop a simple, sensitive, selective and rapid fluorimetric method for determining AA. The product of this photochemical reaction, Leucothionine blue, is a highly florescent specimen, which is used for sensitive determination of AA in flow injection system.In our study, Methylene Blue (MB), a member of thiazine dye groups like thionine blue, was used for the fluorimetric determination of AA. MB is widely used in a number of different areas e.g. a photo sensitizer to produce singlet oxygen in photodynamic therapy for the treatment of cancer. The highly colored oxidized form of MB can be reduced to the colorless leuco form Leuco-Methylene Blue (LMB), as shown in Fig. 1.18) The redox indicator properties of this couple have been used extensively in chemical analyses. The reaction between AA and MB was used for AA determination in pharmaceuticals or fruit juices by using spectrophotometry, 19) amperometry 20,21) or voltammetry. 22)In this study, the determination of AA is based on the measurement of decreasing of the fluorescence intensity of MB due to the reaction between AA and MB, where MB is reduced to colorless LMB and AA is oxidized to dehydroascorbic acid (DHAA). This method allows us to determine the amount of AA in the purified materials, specifically Vit...

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Electrochemical study of methylene blue incorporated into mordenite type zeolite and its application for amperometric determination of ascorbic acid in real samples

Cited by 101 publications

References 41 publications

Electrosynthesis and electrochemical characterisation of phenazine polymers for application in biosensors

Electrosynthesis and electrochemical characterisation of phenazine polymers for application in biosensors

A Comparative Study on Electrochemical Determination of Vitamin C in Liver and Tomato Using Platinum and Glassy Carbon Electrodes (Original Article)

Fluorimetric Determination of Ascorbic Acid in Vitamin C Tablets Using Methylene Blue

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