*2.1. Reagents and Standards*

2,2-Diphenyl-1-picrylhydrazyl (DPPH), 2,2-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid) diammonium salt (ABTS), ferric reducing antioxidant potential (FRAP), 2,4,6- tripyridyl-s-triazine (TPTZ), (+)-catechin, gallic acid, and Trolox (6-hydroxy-2,5,7,8-tetrame thylchroman-2-carboxylic acid) were purchased from Sigma Chemical Co. (Switzerland). Folin–Ciocalteu's phenol reagen<sup>t</sup> was purchased from Merck (Germany). All chemicals used were of analytical grade. Standard solutions were prepared with distilled deionized water.
