Hplc ms grade water

L-Proline (>99%), PEG 6000, ninhydrin, 2,2′-azobis(2 methylpropionamidine)dihydrochloride (AAPH), (±)-6-hydroxy-2,5,7,8-tetramethylchromane-2-carboxylic acid (Trolox) and potassium ferricyanide (K₃[Fe(CN)₆]) were acquired from Acros Organics (Geel, Germany). Lactic acid, and fluorescein were purchased from Panreac (Barcelona, Spain). Sodium carbonate anhydrous (Na₂CO₃), ferric chloride (FeCl₃), Folin-Ciocalteu’s reagent, and gallic acid were acquired from VWR (Leuven, Belgium). Ascorbic acid, acetic acid, and potassium iodide were acquired from Merck (Darmstadt, Germany). Salicylic acid (SA), methyl jasmonate (MeJA), Fe₃O₄ nanoparticles (50–100 nm), hydrogen peroxide (H₂O₂), trichloroacetic acid (TCA), L- proline (≥99%), 2,2-diphenyl-1-picrylhydrazyl (DPPH), 3,4-dihydroxy-L-phenylalanine (L-DOPA), 2,2′-azino-bis (3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt tablets (ABTS), mushroom tyrosinase (EC 1.14.18.1), kojic acid, potassium persulfate (K₂S₂O₈), potassium bromide, HPLC-MS-grade water, HPLC-MS-grade acetonitrile, luteolin, epigallocatechin gallate, protocatechuic acid, and formic acid were obtained from Sigma–Aldrich (Steinheim, Germany). Rosmarinic acid and quercetin were supplied by Extrasynthese (Genay, France), and ρ-coumaric, caffeic acid, and catechin were provided by AASC Ltd. (Southhampton, UK).

L-Proline (>85%), ninhydrin, choline chloride, and (±)-6-hydroxy-2,5,7,8-tetramethylchromane-2-carboxylic acid (Trolox) were purchased from Acros Organics (Geel, Germany). Lactic acid was acquired from Panreac (Barcelona, Spain), and gallic acid, Folin–Ciocalteu (F-C) reagent, and sodium carbonate from VWR (Leuven, Belgium). Sodium hydroxide (NaOH), ascorbic acid, potassium iodide, and acetic acid were supplied by Merck (Darmstadt, Germany). Trichloroacetic acid (TCA), 2-thiobarbituric acid (TBA), hydrogen peroxide (H₂O₂), L-Proline (≥99%), indole-3-acetic acid, toluene, Bradford reagent, glucose, shikimic acid, periodic acid, cinnamic acid, Bovine Serum Albumin (BSA), luteolin, protocatechuic acid, and epigallocatechin gallate, HPLC-MS-grade water, HPLC-MS grade acetonitrile, and formic acid were purchased from Sigma–Aldrich (Steinheim, Germany). Quercetin and rosmarinic acid were acquired from Extrasynthese (Genay, France). Catechin, caffeic, and ρ-coumaric acids were supplied by AASC Ltd. (Southhampton, UK). Phenol, glycine, sulfuric acid, 6-benzyladenine were acquired from Fluka (Buchs, Switzerland), and L-phenylalanine was obtained from Fisher Scientific (Leicestershire, UK).