Sodium carbonate na2co3 sodium hydroxide naoh

Trolox (6-hydroxy-2,5,7,8-tetramethylchroman-2-carboxylic acid), 2,2'-azino-bis(3-ethyl benzothiazoline-6-sulfonic acid) (ABTS) diammonium salt, 2,4,6-tris(2-pyridyl)-s-triazine (TPTZ), gallic acid, aluminium chloride (AlCl₃), β-carotene and fluorescein sodium salt were procured from Sigma-Aldrich. Magnesium, mercury (II) chloride, 2,2-diphenyl-1-picrylhydrazyl (DPPH), sodium acetate trihydrate, Folin-Ciocalteu phenol reagent, sodium carbonate (Na₂CO₃), sodium hydroxide (NaOH) and sodium acetate trihydrate were acquired from Merck. ( +)-Catechin hydrate, Tween 20, linoleic acid, 2,2’-azobis (2- methylpropionamidine) dihydrochloride (AAPH) and di-potassium hydrogen phosphate anhydrous were obtained from ChemSoln. Iron (III) chloride-6-hydrate and sodium nitrite were acquired from Bendosen. Ascorbic acid and gelatine were purchased from R&M Chemicals, potassium dihydrogen phosphate and potassium persulphate were from John Kollin Corporation. Iron (II) sulfate, iodine and ammonia solution were obtained from Fisher Scientific and glacial acetic acid was obtained from Chemiz. Hydrochloric acid (HCl) and sulfuric acid (H₂SO₄) were from Univar. Potassium iodide was purchased from Systerm.