Original scientific paper
https://doi.org/10.17113/ftb.56.03.18.5618
Electrochemical Study and Determination of All-trans-Retinol at Carbon Paste Electrode Modified by a Surfactant
Simona Žabčíková
; Department of Analytical Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentská 573, CZ-53210 Pardubice, Czech Republic
Tomáš Mikysek
; Department of Analytical Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentská 573, CZ-53210 Pardubice, Czech Republic
Libor Červenka
; Department of Analytical Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentská 573, CZ-53210 Pardubice, Czech Republic
Milan Sýs
orcid.org/0000-0002-3982-3659
; Department of Analytical Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentská 573, CZ-53210 Pardubice, Czech Republic
Abstract
The oxidation mechanism of all-trans-retinol (vitamin A1) and its several esters in non-aqueous, aqueous organic mixture, and pure aqueous media was investigated by cyclic voltammetry. The oxidation occurred in several irreversible steps. The calculated highest density of electrons in retinoid molecules which are delocalized over carbon atoms of the five conjugated double bonds (C5-C14) was found in the part of the molecule involved in oxidation processes. The most sensitive oxidation peak (at +0.8 V vs. Ag/AgCl) was used for development of new direct voltammetric method based on differential pulse voltammetry for the determination of retinol at carbon paste electrode modified with surfactant sodium dodecyl sulfate (CPE/SDS). The results show that 30 % (by mass) of modifier SDS exhibited optimal sensitivity and shape of voltammograms. Compared to commonly used glassy carbon electrode (GCE), the CPE/SDS showed significant progress in the retinol electroanalysis. The linear ranges for retinol determination were 1.5·10^−6–1.8·10^−4 M for CPE/SDS and 4.4·10^−6–7.0·10^−4 M for GCE with the detection limits of 1.3·10^−6 and 4.6·10^−7 M, respectively.
Keywords
modified carbon paste electrode; differential pulse voltammetry; glassy carbon electrode; all-trans-retinol, surfactant
Hrčak ID:
207619
URI
Publication date:
30.9.2018.
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