Disodium carbonate

Tyrosinase from mushroom (SLBJ5647, activity of 5771 unit/mg), 3,4-dihydroxy-l-phenylalanine (l-DOPA), dimethyl sulfoxide (DMSO), Folin and Ciocalteu’s Phenol reagent, 2,2-diphenyl-l-picrylhydrazyl (DPPH), sodium dihydrogen phosphate, 3-(4,5-dimethylthaizol-2-yl)-2,5-diphenyltetrazolium bromide (MTT), kojic acid, gallic acid, quercetin, oxyresveratrol, resveratrol, and glabridin were purchased from Sigma-Aldrich, Inc. (St. Louis, MO, USA). Disodium hydrogen phosphate and disodium carbonate were supplied by Merck Millipore (Temecula, California, USA). l-ascorbic acid and aluminium choride were purchased from Ajax Finechem (Taren Point, Australia).

Sodium dihydrogen phosphate (NaH₂PO₄), potassium ferrocyanide (K₃Fe(CN)₆), trichloroacetic acid (TCA), iron-III-chloride (FeCl₃), potassium peroxydisulfate (K₂O₈S₂) copper-II-chloride (CuCl₂), sodium acetate (NaCH₃COO), hydrochloric acid (HCl), tris, iron-II-sulfate (FeSO₄), iron-II-chloride (FeCl₂), disodium hydrogen phosphate (Na₂HPO₄), methionine, ethanol, ethylenediaminetetraacetic acid (EDTA), ammonium thiocyanate (NH₄SCN), sodium bicarbonate (NaHCO₃), sodium hydroxide (NaOH), disodium sulfate (Na₂SO₄), sodium perchlorate (NaClO₄), and disodium carbonate (Na₂CO₃) were obtained from Merck (Merck, made in Germany). Cis-9, cis-12-octadecanoic acid (linoleic acid), 2,2-diphenyl-1-picrylhydrazyl (DPPH), polyoxyethylene sorbitan monolaurate (Tween 20), nitroblue tetrazolium (NBT), 3-(2-pyridyl)-5,6-diphenyl-1,2,4-triazine-4′,4′′-disulfonic acid sodium salt (ferrozine), riboflavin (vitamin B2), N-N-Dimethyl-p-phenyl-enediamine dihydrochloride (DMPD), neocuproine hydrate (C₄H₁₂N₂·XH₂O), 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) diammonium sulfate (ABTS), ID-8 (C₆H₁₄N₂O₄), 3,4-dihydroxy-5-methoxybenzoic acid (C₈H₈O₅), silychristin (C₂₅H₂₂O₁₀), malvin (C₂₉H₂₈O₁₇), pelargonin (C₂₇H₃₁O₁₅), oenin (C₂₃H₂₅O₂), arachidonoyl dopamine (C₂₈H₄₁NO₃), callistephin (C₂₁H₂₁O₁₀), and 2,4,6-trihydroxy-benzaldehyde (C₆H₂CHO) were purchased from Sigma Aldrich Company (St Louis, MO, USA).