Quercetin 3 d glucoside

CMC was purchased from CP Kelco (Äänekoski, Finland). Sucrose was a product of Gram-mol (Zagreb, Croatia). Trehalose was obtained from Hayashibara doo (Nagase group, Tokyo, Japan). Hydrochloric acid was from Carlo Erba Reagents (Sabadell, Spain). Sodium carbonate was from T.T.T. (Sveta Nedelja, Croatia). Folin–Ciocalteu reagent and potassium persulfate were from Kemika (Zagreb, Croatia). Trolox, 2,2-diphenyl-1-picrylhydrazil, 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt, and most of the standards used (rutin, quercetin, quercetin-3-D-glucoside, chlorogenic acid) were products of Sigma-Aldrich (St. Louis, MO, USA), while the standards of cyanidin-3-glucoside, cyanidin-3-galactoside, cyanidin-3-arabinoside, neochlorogenic acid, and quercetin-3-D-galactoside were products of Extrasynthese (Genay, France). Cupric chloride, neocuproine, and 2,4,6-tri(2-pyridyl)-s-triazine (TPTZ) were purchased from Acros Organic (Geel, Belgium). Methanol (HPLC grade) was from J.T. Baker (Deventer, Netherlands) and orthophosphoric acid (HPLC grade, >85%) was from Fisher Scientific (Longhborough, UK).