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KMID : 0620719960020020106
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Natural Product Sciences
1996 Volume.2 No. 2 p.106 ~ p.114
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On The Chemical, Botanical, and Chemotaxonomical Evaluation of The Genus Citrus -Part I : Polymethoxyflavones of The Leaf of Citrus deliciosa Ten.-
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El-Domiaty Maher M.
Abdel-Aal Mahmoud M.
El-Shafae Azza M.
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Abstract
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Four polymethoxyfavones were isolated from the leaves of Citrus deliciosa, three of which (nobiletin, 5-O-demethylnobiletin, and tangeritin) are bioactive. The fourth (7,4’-dihydroxy-5,6,8,3’-tetramethoxyflavone) is reported for the first time in the genus Citrus and is a potential chemotaxonomic marker. The structures of these flavones were confirmed by analysing their spectral data and comparison with similar compounds. The previously reported ¹³C NMR assignment of 5-O-demethylnobiletin has been revised on the basis of 2D NMR experiments (HETCOR, COSY, and COLOC). The chemotaxonomic value of the present finding is verified.
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KEYWORD
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Citrus deliciosa, Rutaceae, Polymethoxyflavones, Nobiletin, 5-demethyl-nobiletin, tangeritin, 7, 4’-dithydroxy-5, 6, 8, 3’-tetramethoxyflavone, ¹³C NMR, Chemotaxonomy
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