文摘
Gradient reversed-phase HPLC was used to obtain quantitative estimatesof the levels of free andconjugated myricetin and quercetin in 65 red wines from Italy, Chile,France, California, Australia,Bulgaria, Spain, Romania, New Zealand, Brazil, Morocco, and Hungary.The concentrations of totalflavonols ranged from 4.6 to 41.6 mg L-1. High totalflavonol levels appear to be associated withthe use of thick-skinned grape varieties, such as Cabernet Sauvignon,with a high skin:volumeratio, which were left to ripen fully in sunny conditions beforeharvest and which were extractedefficiently by modern methods of vinification. Some ChileanCabernet Sauvignon wines containedup to 40 mg of total flavonols L-1, which was higher thanthe levels detected in Cabernet Sauvignonfrom France, California, and Australia. The flavonol content of1989 and 1990 Cabernet Sauvignonfrom Bulgaria was <6 mg L-1. Chilean CabernetSauvignon, Merlot, and Pinot Noir all containedconsistently higher concentrations of flavonols than their counterpartsfrom different geographicalregions.Keywords: HPLC; quantitative analysis; flavonols; myricetin; quercetin; redwines
