Identyfikatory
Warianty tytułu
Voltammetric identification and determination of antioxidants in plant oils in mixed solvent acetic acid - ethyl acetate
Języki publikacji
Abstrakty
Zastosowano woltamperometrię pulsową różnicową (DPV) na mikroelektrodzie do identyfikacji i oznaczania antyutleniaczy: witaminy E (tokoferoli), sezamolu i BHT (2,6-di-te/t-butylohydroksytoluen) w olejach roślinnych. Metoda jest prosta i szybka, a przygotowanie roztworów ogranicza się do rozpuszczenia oleju w rozpuszczalniku mieszanym kwas octowy - octan etylu (3:2, v/v), zawierającym 0,1 M Na-CI04 jako elektrolit podstawowy. Uzyskane wyniki są zgodne z danymi literaturowymi dla sezamolu oraz całkowitej zawartości witaminy E w przeliczeniu na alfa-tokoferol. Ze względu na niewystarczające różnice pomiędzy potencjałami utleniania alfa-, gamma- i delta-tokoferoli, składniki witaminy E nie mogą być analizowane oddzielnie. Zawartość BHT w niektórych olejach przekraczała dopuszczalny poziom 0,01%.
Differential pulse voltammetry (DPV) at a microelectrode has been applied to the identification and quantification of antioxidants: vitamin E (tocopherols), sesamol and BHT (2,6-di-tert-butylhydroksytoluene) in plant oils. The method is simple, fast and the preparation of the solutions is limited just to the dissolution of the oils in a mixed solvent acetic acid - ethyl acetate (3:2, v/v) containing 0.1 M NaCI04 as the supporting electrolyte. The obtained results are in a good accordance with the literature data for sesamol and the total amount of vitamin E expressed as a-tocopherol content. Because of small differences between the oxidation potentials for alpha-, gamma- anddelta6-tocopherol, the components of vitamin E cannot be analyzed separately. The content of BHT in some oils exceeds the permitted level of 0.01%.
Czasopismo
Rocznik
Tom
Strony
57--64
Opis fizyczny
Bibliogr. 21 poz., tab., wykr.
Twórcy
autor
- Uniwersytet Jana Kochanowskiego w Kielcach, Instytut Chemii
Bibliografia
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- [3] Ruperez F.J., Martin D., Herrera E., Barbas C., Chromatographic analysis of alpha-tocopherol and related compounds in various matrices. J. Chromatogr. A 935 (2001), 45-69,
- [4] Schwartz H., Olliainen V., Piironen V., Lampi A.-M., Tocopherol, tocotrienol and plant sterol contents of vegetable oils and industrial fats, J. Food Comp. Anal.,, 21 (2008), 152-161.
- [5] Gliszczyńska-Świgło A., Sikorska E., Simple reversed-phase liquid chromatography method for determination of tocopherols in edible plant oils, J. Chromatogr. A, 1048 (2004), 195-198.
- [6] Sin D.W.M., Wong Y.C., Mak C.Y., Sze S.T., Yao W.Y., Determination of five phenolic antioxidants in edible oils: Method validation and estimation of measurements uncertainty, J. Food Comp. Anal., 19 (2006), 784-791.
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- [10] Diaz T.G., Meras I.D., Cabanillas A.G., Franco M.F.A., Voltammetric behavior and determination of tocopherols with partial least squares callibration: Analysis in vegetable oil samples, Anal. Chim Acta, 511 (2004), 231-238.
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- [12] Stojek Z., New possibilities in analytical chemistry connected with voltammetric applications of microelectrodes, Microchim. Acta [Wien], II (1991), 353-361.
- [13] Coatanea M., Darchen A., Hauchard D., Electroanalysis at uItramicroelectrodes of oils and fats. Application to the determination of vitamin E, Sens. Actuators B, 76 (2001), 539-544.
- [14] Ceballos C., Fernandez H,, Synthetic antioxidants determination in lard and vegetable oils by the use of voltammetric methods on disk ultramicroelectrodes, Food Res. Int., 33 (2000), 357-365.
- [15] Michalkiewicz S., Kaczor M., Potential windows accessible to platinum and carbon electrodes in acetic acid and its mixtures with ethyl acetate, Chem. Anal., (Warsaw), 49 (2004), 121-128.
- [16] Michalkiewicz S., Tutaj M., Kaczor M., Malyszko J., Electrochemical behavior of tocopherols on microelectrodes in acetic acid medium, Electroanalysis, 14 (2002), 297-302.
- [17] Michalkiewicz S., Pryciak M., Malyszko J., Oszczudlowski J., Voltammetric determination of alpha-tocopheryl acetate in pharmaceutical dosage forms, Electroanalysis, 16 (2004), 961-965.
- [18] Fukuda Y., Nagata M., Osawa T., Namiki M., Contribution of lignan analogues to antioxidative activity of refined unroasted sesame seed oil, J, Am. Oil Chem. Soc., 63 (1986), 1027-1031.
- [19] Kamal-Eldin A., Appelqvist L.A., Variations in the composition of sterols, tocpoherols and lignans in seed oils from four sesamum species, J. Am. Oil Chem. Soc., 71 (1994), 149-156.
- [20] Cho W.-S., Birch J., Dufour J.-P., Physicochemical and quality characteristics of cold-pressed flaxseed oils, J. Food Comp. Anal., 20 (2007), 202-211.
- [21] Delgado M.M., Gonzalez-Maza I.G., Sanchez-Perez A., Martinez R.C., Analysis of synthetic phenolic antioxidants in edible oils by micellar electrokinetic capillary chromatography, Food Chem., 100 (2007), 1722-1727.
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-AGHM-0053-0024