Folin ciocalteu reagent lr

Gallic acid monohydrate (≥98.0%), (−)-epigallocatechin-3-gallate (≥95%),(−)-epigallocatechin (≥95%, HPLC), (−)-epicatechin-3-gallate (≥95%, HPLC), (+)-catechin (≥95%, HPLC), (−)-epicatechin (≥90%, HPLC), caffeine (anhydrous, 99%), theaflavin (≥90%, HPLC), theaflavin-3-gallate (≥95%, HPLC), theaflavin-3′-gallate (≥90%, HPLC), theaflavin-3,3′-digallate (≥90%, HPLC), 2,2-diphenyl-1-picrylhydrazyl (DPPH), 6-hydroxy-2,5,7,8-tetramethylchroman-2-carboxylic acid (Trolox), 2,2′-azinobis(3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt (ABTS), potassium persulfate, 2,4,6-tri(2-pyridyl)-s-triazine (TPTZ) and iron(iii) chloride hexa-hydrate were purchased from Sigma-Aldrich, India. Folin-Ciocalteu reagent (LR) was obtained from Himedia (HiMedia Laboratories, India). Acetonitrile (HPLC grade), acetic acid (HPLC grade), sodium carbonate and all other chemicals were procured from Merck KGaA, Darmstadt, Germany.