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On-line version ISSN 1678-4618
SILVA, D. H. S.; PEREIRA, F. C.; YOSHIDA, M. and ZANONI, M. V. B.. Electrochemical evaluation of lipophilic antioxidants from Iryanthera juruensis fruits (Myristicaceae). Eclet. Quím. [online]. 2005, vol.30, n.3, pp. 15-21. ISSN 1678-4618. http://dx.doi.org/10.1590/S0100-46702005000300002.
TLC autographic assays revealed in the hexane extract of Iryanthera juruensis (Myristicaceae) the presence of two compounds, with antioxidant properties towards b-carotene. They were isolated and identified as 3-methyl-sargachromenol (1) and sargachromenol (2). Further investigation of the hexane extract led to isolations of 3-methyl-sargaquinoic acid (3) and sargaquinoic acid (4). The electrochemical behaviour of these compounds was studied in CH2Cl2/Bu4NBF4 at glassy carbon electrode. The phenolic group in both tocotrienols 1 and 2 are oxidized at +0.23V and +0.32V and their oxidation potentials are correlated with the observed antioxidant activities and oxidation mechanism of a-tocopherol. The reductive voltametric behaviour of quinone function in both plastoquinones 3 and 4 is discussed.
Keywords : Iryanthera juruensis; antioxidants; cyclic voltammetry; Myristicaceae.