The Flavonoid Glycosides and Procyanidin Composition of Deglet Noor Dates (Phoenix dactylifera)

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• 作者：Yun Jeong Hong ; F. A. Tomas-Barberan ; Adel A. Kader ; and Alyson E. Mitchell
• 刊名：Journal of Agricultural and Food Chemistry
• 出版年：2006
• 出版时间：March 22, 2006
• 年：2006
• 卷：54
• 期：6
• 页码：2405 - 2411
• 全文大小：147K
• 年卷期：v.54,no.6(March 22, 2006)
• ISSN：1520-5118

文摘

The fruits of the date palm (Phoenix dactylifera) are consumed throughout the world and are animportant part of the diet in the Middle East. Dates at the rutab and tamar maturity and ripeningstages contain a wide array of phenolic antioxidants, but little is known about the composition ofphenolic compounds in dates at the khalal stage of ripening. In the current study, the flavonoidglycoside and procyanidin compositions of dates of the cultivar Deglet Noor harvested at the khalalstage of maturity were characterized using liquid chromatography-electrospray ionization-tandemmass spectrometry (LC-ESI/MS/MS). Procyanidin oligomers through decamers were identified inextracts of these dates. Higher molecular weight polymers, undecamers through heptadecamers,were also apparent from mass spectra. Thirteen flavonoid glycosides of luteolin, quercetin, andapigenin, 19 when considering isomeric forms, were also identified. Mass spectra indicate that bothmethylated and sulfated forms of luteolin and quercetin are present as mono-, di-, and triglycosylatedconjugates whereas apigenin is present as only the diglycoside. LC-ESI/MS/MS spectra indicatethat quercetin and luteolin formed primarily O-glycosidic linkages whereas apigenin is present as theC-glycoside.Keywords: Date palm; Phoenix dactylifera; procyanidins; flavonoid glycoside; luteolin; quercetin;apigenin; LC-ESI/MS/MS