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Alliuocide A: a new antioxidant flavonoid from Allium cepa L

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Author(s): Gamal A. Mohamed

Journal: Phytopharmacology
ISSN 2046-1194

Volume: 4;
Issue: 2;
Start page: 220;
Date: 2013;
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Keywords: Allium cepa L. | alliuocide A | antioxidant | DPPH

ABSTRACT
Re-investigation of the EtOAc fraction of the dried outer scales ofAllium cepa L. afforded one new flavonoid; alliuocide A (6), together with five known compoundds. Their structures were established by UV, IR, 1D (1H and 13 C), and 2D (1H-1H COSY, HMQC and HMBC) NMR, in additio n to mass spectroscopy and comparison with literature data. All the isolated compounds were tested for their antioxidant activity using DPPH assay. Compounds 3,5 and 6 showed high antioxidant activeity, while 1,2, and 4 had moderate activity.
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