Chemicals and Standards. Folin−Ciocalteu reagent, gallic acid,and quercetin standards were purchased from Sigma (St. Louis, MO,USA). Cyanidin-3-glucoside was purchased from Extrasynthese (Genay, France). The solvents used in chromatography were of HPLC grade and purchased from Merck (Darmstadt, Germany). All other chemicals were of analytical grade and supplied by Panreac Quıḿ ica (Barcelona, Spain).