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Simultaneous Determination of Lipophilic Vitamin Esters Using Square-wave Voltammetry at the Glassy Carbon Electrode |
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| Authors: | Granit Jashari Arbër Musliu Dr Milan Sýs Prof?Dr Tahir Arbneshi Dr Tomá? Mikysek Prof?Dr Ivan ?vancara Dr Radovan Metelka |
| Institution: | 1. University of Pardubice, Faculty of Chemical Technology, Department of Analytical Chemistry, Studentská 573, 532 10 Pardubice, Czech Republic;2. University of Pristina, Faculty of Mathematics and Natural Sciences, Department of Chemistry, Str. Mother Teresa, Prishtina, 10 000 Republic of Kosovo |
| Abstract: | Simple and rapid voltammetric method for simultaneous determination of all-trans-retinyl acetate (RAc) or all-trans-retinyl palmitate (RPa) and α-tocopheryl acetate (α-TOAc) has been proposed. The respective method was based on the anodic oxidation of the compounds of interest by square-wave voltammetry in acetone with 0.1 mol L?1 LiClO4 at the glassy carbon electrode. The procedure was also beneficial with respect to simple dissolution of sample directly in the supporting electrolyte. The all-trans-retinyl acetate could be quantified in two linear ranges (3.1–140 μmol L?1 and 140–400 μmol L?1) and α-tocopheryl acetate in linear range 5.3–400 μmol L?1 with detection limits of 0.9 μmol L?1 RAc (or 0.8 μmol L?1 RPa) and of 1.6 μmol L?1 α-TOAc. Selected commercial cosmetic products were analysed achieving satisfactory recoveries. |
| Keywords: | Retinyl acetate Retinyl palmitate α-Tocopheryl acetate Square-wave voltammetry Cosmetics |