Palavras-chave
antioxidants
cyclic voltammetry
Myristicaceae
Como Citar
Resumo
TLC autographic assays revealed in the hexane extract of Iryanthera juruensis (Myristicaceae)the presence of two compounds, with antioxidant properties towards β-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 CH 2 Cl 2 /Bu 4 NBF 4 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 α-tocopherol. The reductive
voltametric behaviour of quinone function in both plastoquinones 3 and 4 is discussed.
Referências
R. E. Schultes, B. Holmstedt, Lloydia 34 (1971) 61.
S. M. B Barros, I. Ishii, D. H. S. Silva, M. Yoshida, Anais
IV International Symposium on Orthomolecular Medicine, São
Paulo,1993, p. 34.
K. Komyiama, M. Hayashi, S. Cha, M. Yamaoka, Lipid-
soluble Antioxidants: Biochemistry and Clinical Applications.
Eds. A. S. H. Ong and L. Parker , 1992, 152 p.
A. Azzi, D. O. Boscoboinik, E. Chatelain, Lipid-soluble
Antioxidants: Biochemistry and Clinical Applications. Eds. Ong,
A. S. H. and Parker, L., 1992, 123p.
M. H. Gordon, Nat. Prod. Rep. 13 (1996) 265.
P. C. Vieira, O. R. Gottlieb, H. E. Gottlieb, Phytochemistry
(1983) 2281.
T. Kusumi, Y. Shibata, M. Ishitsuka, T. Kinoshita, H.
Kakisawa, Chem. Lett. 3 (1979) 277.
W.R. Sousa, C. Rocah, C. L. Cardoso, D. H. S. Silva, M.
V. B. Zanoni, J. Food Compos. Anal. 17 (2004) 619.
M. M. Baizer, H. Lund, Organic Electrochemistry, Marcel
Dekker, New York, 1983, p.493.
S. Chevion, M. A. Roberts, M. Chevion, Free Rad. Biol.
Med. 28 (2000) 860.
S. Chevion, M. Chevion, P. B. Chock, G. R. Beecher, J.
Medic. Food. 2 (1999)1.
D. A. Markovic, Z. Djarmati, R. M. Jankov, L. M.
Igynatovic, Mickrochim. Acta 124 (1996) 219.
J. P. Hart, Electroanalysis of Biologically Compounds, Ellis
Horwood, West Sussex, UK, 1990.
R. D.Webster, Electrochem. Comm. 1 (1999) 581.
T. Y. Zhang, S. M. Zhu, Anal. Chim. Acta 309 (1995)
M. F. Marcus, M. D. Hawley, Biochem. Biophys. Acta
(1970)1.
J.Q. Chamber, The Chemistry of the Quinonoid Com-
pounds, Part 2, S. Patai Ed., Wiley Int. London, 1999.
D. H. S. Silva, F. C. Pereira, M. V. B. Zanoni, M. Yoshida,
Phytochemistry 57 (2001) 437.
A. J. Bard, R. L. Faulkner, Electrochemical Methods –
Fundamentals and Applications , John Wiley, N.Y., 1980.
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