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The flavonol profiles of a wide set of Vitis vinifera white grape cultivars were determined by HPLC–DAD–ESI-MS n in order to confirm the presence of isorhamnetin-type flavonols and also to evaluate their ability for cultivar authenticity and differentiation. Only 3-O-glycoside derivatives of kaempferol, quercetin and isorhamnetin were identified as grape flavonols. The 3-O-glucosides and 3-O-galactosides...
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