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Flavonols are a class of polyphenol compounds whose importance for wine quality has increased as their structures and properties have become better understood. Here, the acetylated and p-coumaroylated derivatives of the flavonol 3-O-glucosides of isorhamnetin, laricitrin and syringetin have been identified for the first time in Vitis vinifera grape skins and wines. First, the MS2 fragmentation patterns...
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