2005
DOI: 10.1021/jf051264d
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Antioxidative Compounds from the Outer Scales of Onion

Abstract: Antioxidative compounds were isolated from the methanol extract of dry outer scales of onion (Allium cepa L.). Nine phenolic compounds (1 − 9) were finally obtained by reversed-phase high-performance liquid chromatography, and their structures were elucidated by NMR and mass spectrometry analyses. They were the six known compounds, protocatechuic acid (1), 2-(3,4-dihydroxybenzoyl)-2,4,6-trihydroxy-3(2H)-benzofuranone (2), quercetin 4‘-O-β-d-glucopyranoside (3), quercetin (5), 4‘-O-β-d-glucopyranoside of querce… Show more

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Cited by 197 publications
(160 citation statements)
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“…5) in accordance with previously reported data (LY et al, 2005). In a similar fashion, compound (9) was identifi ed as a quercetin dimer (LY et al, 2005;GÜLŞEN et al, 2007a). Compounds (1) and (9) have been demonstrated to derive from quercetin through oxidative cleavage by onion peroxidase (OSMAN et al, 2008).…”
Section: Polyphenolic Compositionsupporting
confidence: 87%
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“…5) in accordance with previously reported data (LY et al, 2005). In a similar fashion, compound (9) was identifi ed as a quercetin dimer (LY et al, 2005;GÜLŞEN et al, 2007a). Compounds (1) and (9) have been demonstrated to derive from quercetin through oxidative cleavage by onion peroxidase (OSMAN et al, 2008).…”
Section: Polyphenolic Compositionsupporting
confidence: 87%
“…These compounds were assigned to adducts of quercetin with quercetin 4´-O-glucoside (Fig. 5) in accordance with previously reported data (LY et al, 2005). In a similar fashion, compound (9) was identifi ed as a quercetin dimer (LY et al, 2005;GÜLŞEN et al, 2007a).…”
Section: Polyphenolic Compositionsupporting
confidence: 85%
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“…It is estimated that more than 450,000 tonnes of onion solid waste is produced each year in Europe (Moure et al 2001). The non-edible portions of the onion bulb, which are considered as waste of onion consumption and processing, contain phenolics with very peculiar structures, not encountered in the edible parts (Furusawa et al 2003;Ly et al 2005;Ramos et al 2006). However, recent studies on the recovery of flavonols from onion solid wastes clearly showed that mainly quercetin and to a lesser extent, quercetin glucosides are the major phenolics in onion trimmings and the outer dry layers, and account for strong antioxidant effects (Beesk et al 2010;Khiari et al 2008;Kiassos et al 2009;Suh et al 1999).…”
Section: Introductionmentioning
confidence: 99%