3,3’,5,5’-tetramethylbenzidine (TMB),
2,2’-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid) (ABTS),
(±)-6-Hydroxy-2,5,7,8-tetramethylchromane-2-carboxylic acid (Trolox C),
caffeic acid, resveratrol, L-tyrosine, nitro-tyrosine, chloro-tyrosine,
indole-3-carbinol, saliciylic acid, levodopa (L-DOPA), dopamine, lipoic acid,
methanol, NaOCl, acetaldehyde, oleic acid, linoleic acid, dinitrophenylhydrazine
(DNPH), horseradish peroxidase, sodium cyanide, tris(2-carboxyethyl)phosphine
(TCEP), sodium hydrosulfite, 2-(4-(2-hydroxyethyl)piperazin-1-yl)ethanesulfonic
acid (HEPES), NaF, sodium cyanide (NaCN), leupeptin, aprotinin, pepstatin,
phenylmethylsulfonyl fluoride (PMSF), reduced β-Nicotinamide adenine
dinucleotide (NADH), Triton X-100, catalase, and bovine glutathione peroxidase
(GPx) were purchased from Sigma Aldrich Corporation (St. Louis, MO). Ascorbic
acid and 5,5′-dithiobis(2-nitrobenzoic acid) (DTNB) were from ICN
Biomedicals Inc. (Aurora, OH). Perchloric acid was from Fisher Scientific
(Waltham, MA). Reduced β-Nicotinamide adenine dinucleotide phosphate
(NADPH) was from Enzo Life Sciences (Farmingdale, NY). Dihydrolipoic acid was
from Calbiochem (San Diego, CA). Ethanol was from Pharmco-AAPER (Shelbyville,
KY). Sodium azide was from Acros (New Jersey, USA). Ethyl acetate was from
BioQuip (Rancho Dominguez, CA).