Cyclic Voltammetry of Retinol in Surfactant Media and Its Application for the Analysis of Real Samples

Ziyatdinova, Guzel; Giniyatova, E. R.; Budnikov, H. C.

doi:10.1002/elan.201000358

Cited by 34 publications

(26 citation statements)

References 31 publications

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“…There are a few reports that describe the voltammetric properties of retinol, retinal and retinoic acid, but most electrochemical studies have been performed as a means of quantifying the compounds in biological samples (such as by HPLC with electrochemical detection), rather than for mechanistic studies. [10–14] Retinol has been reported to be oxidized at approximately +0.8 V vs. Ag/AgCl (satd. KCl) in tetrahydrofuran (THF) containing tetabutylammonium perchlorate,[10] in methanol containing acetate buffer,[11] or in acetonitrile/water containing LiClO 4 .…”

Section: Discussionmentioning

confidence: 99%

“…KCl) in tetrahydrofuran (THF) containing tetabutylammonium perchlorate,[10] in methanol containing acetate buffer,[11] or in acetonitrile/water containing LiClO 4 . [14] The oxidation process has been described as chemically irreversible in the sense that only a forward oxidative peak is observed during cyclic voltammetry measurements. [10,11,14] On the CV timescale (≤ seconds), the electrochemical oxidation of retinol in THF has been reported to occur via one electron per molecule while the oxidation of retinal in THF occurs at approximately +1 V vs. Ag/AgCl (satd.…”

Section: Discussionmentioning

confidence: 99%

“…[14] The oxidation process has been described as chemically irreversible in the sense that only a forward oxidative peak is observed during cyclic voltammetry measurements. [10,11,14] On the CV timescale (≤ seconds), the electrochemical oxidation of retinol in THF has been reported to occur via one electron per molecule while the oxidation of retinal in THF occurs at approximately +1 V vs. Ag/AgCl (satd. KCl) and involves the transfer of up to four electrons per molecule (in a chemically irreversible process).…”

Section: Discussionmentioning

confidence: 99%

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Voltammetry of the liposoluble vitamins (A, D, E and K) in organic solvents

Webster

2011

The Chemical Record

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A review summarizing the voltammetric literature of the liposoluble vitamins A, D, E and K in organic solvents containing supporting electrolyte is presented. Electrochemical studies that were performed by attaching the vitamins to electrode surfaces and performing voltammetric scans in aqueous solutions are also summarized. Vitamins A (retinol and retinal) and D (cholecaliferol and ergocalciferol) undergo chemically irreversible voltammetric oxidation processes in organic solvents to form complicated or unknown compounds that cannot be electrochemically converted back to the starting materials. In contrast to vitamins A and D, vitamins E and K undergo chemically reversible electron-transfer processes that are often coupled to proton-transfer reactions. Vitamin E (a phenol) is voltammetrically oxidized in aprotic organic solvents in a -2e(-)/-H(+) process to form a diamagnetic cation, which is unusually long-lived compared to the analogous cations produced during the oxidation of other phenols. In an aqueous environment, vitamin E is electrochemically oxidized to the hydroquinone in a chemically irreversible -2e(-) process. In low moisture content aprotic solvents, vitamin K (a quinone) is reduced in two one-electron chemically reversible steps to form first a radical anion (semiquinone, at E(1)) and then at more negative potentials a dianion is formed (at E(2)). The dianion is especially prone to strong hydrogen-bonding interactions with trace water present in the organic solvents, resulting in a shift in the formal reduction potential of E(2) to more positive potentials as more water is added to the solvent.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Voltammetry of the liposoluble vitamins (A, D, E and K) in organic solvents

Webster

2011

The Chemical Record

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“…It has been seen that surfactants have great significance in electrode reactions, not only in solubilizing organic compounds but also in providing specific orientation of the molecules at the electrode surface and have been used in electrochemical investigations [15][16][17]. Chemically modified electrodes and surfactants have been widely used for electrochemical studies [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Electrocatalytic quantifaction of antitubarcular drug ethionamide in sodium lauryl sulfate

Jain

Tiwari

Pandey

2014

Journal of Molecular Liquids

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“…The calibration graph was linear in the range 29.4-980 μM of retinol with a detection limit of 15 μM in the presence of 1.1×10 −4 M of sodium dodecyl sulfate. The application of a surfactant medium led to a decrease in the detection limit, an enlarged analytical range for retinol determination, and the capacity to perform retinol analysis in water media [29].…”

Section: Introductionmentioning

confidence: 99%

MWNT-modified electrodes for voltammetric determination of lipophilic vitamins

Ziyatdinova

Morozov

Budnikov

2011

J Solid State Electrochem

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Multi-walled carbon nanotube modified graphite electrodes (MWNT-GEs) have been created for the voltammetric determination of α-tocopherol and retinol. The electrode surface was characterized by atomic force microscopy. The MWNT-GEs presented structured surfaces and a significant (26-fold) increase in roughness over unmodified graphite electrodes (8.2 vs. 0.32 nm for MWNT-GEs and GEs, respectively). Their surfaces consisted of aggregates with a highly regular "thorn-like" structure. α-Tocopherol and retinol were oxidized on the bare GEs and the MWNT-GEs in 0.1 M HClO 4 in acetonitrile. Decreases in the overpotential of 0.2 and 0.04 V for α-tocopherol and retinol, respectively, and increased oxidation currents were observed on the MWNT-GEs in comparison with the unmodified electrodes. The calibration graphs were linear in the range 0.065-2.00 mM for α-tocopherol and 0.05-1.50 mM for retinol. The detection limits were found to be 0.05 and 0.04 mM for α-tocopherol and retinol, respectively. The developed electrodes were applied to determine α-tocopherol and retinol in pharmaceuticals. The results obtained agreed well with coulometric titration data.

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Cyclic Voltammetry of Retinol in Surfactant Media and Its Application for the Analysis of Real Samples

Cited by 34 publications

References 31 publications

Voltammetry of the liposoluble vitamins (A, D, E and K) in organic solvents

Voltammetry of the liposoluble vitamins (A, D, E and K) in organic solvents

Electrocatalytic quantifaction of antitubarcular drug ethionamide in sodium lauryl sulfate

MWNT-modified electrodes for voltammetric determination of lipophilic vitamins

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