2.1. Chemicals
2,20
-Azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) diammonium
salt, cyanidin-3-glucoside, methanol, hydrochloric acid,
Folin-Ciocalteu phenol reagent, Trolox and sodium carbonate
were from Sigma-Aldrich (Switzerland). All solvent used were of
analytical grate