Epicatechin

Catechin (C, ≥98%), galloCatechin (GC, ≥98%), galloCatechin-3-gallate (GCG, ≥98%), epiCatechin (EC, ≥98%), epiCatechin-3-gallate (ECG, ≥98%), epigalloCatechin (EGC, ≥98%), epigalloCatechin-3-gallate (EGCG, ≥98%), caffeine (CAF, ≥98%), theaflavins (TF, ≥95%), theaflavins-3-gallate (TF3G, ≥98%), theaflavin-3′-gallate (TF3′G, ≥98%), theaflavine-3,3′-digallate (TFDG, ≥98%), quercetin-3-O-galactoside (≥98%), myricetin-3-O-galactoside (≥98%), kaempferol-3-O-rutinoside (≥98%), vitexin (≥98%), astragaloside (≥98%), quercetin (≥98%), and kaempferol (≥98%) were purchased from Shanghai yuanye Bio-Technology Co., Ltd. (Shanghai, China). l-alanine, l-arginine, l-aspartic acid, l-cystine, l-glutamic acid, glycine, l-histidine, l-isoleucine, l-leucine, l-lysine, l-methionine, l-phenylalanine, l-proline, l-serine, l-threonine, l-tyrosine, l-valine, l-asparagine, l-glutamine, theanine, γ-aminobutyric acid, and l-tryptophan were purchased from Sigma (Sigma-Aldrich Co., St. Louis, MO, USA). Anthrone reagent and ninhydrin/formic acid reducing agent were purchased from BeiJing DingGuochangSheng Biotech. Co., Ltd. (Bejing, China). Ethyl caprate (≥99%) was purchased from Shanghai Macklin Biochemical Technology Co., Ltd. (Shanghai, China), and n-alkane mixed standard C7-C40 was purchased from o2si (o2si smart solutions—an LGC Standards Company, Charleston, SC, USA).

The 2, 2-diphenyl-1-picrylhydrazyl (DPPH), 2, 2′-azino-bis-(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS), 2, 4, 6-Tris(2-pyridyl)-s-triazine (TPTZ), 2, 6-di-tert-butyl-4-methylphenol (BHT), vitamin C (Vc), were obtained from Solarbio Life sciences (Beijing, China). All chemical reagents including methanol, ethyl acetate (EtOAc), petroleum ether (PE), Dichloromethane (DCM), and n-butanol (n-BuOH) were purchased from Sinopharm Chemical Reagent Co., Ltd. (Shanghai, China). Chromatographic acetonitrile was purchased from Merck (Darmstadt, Germany). Folin-Ciocalteu, pyrogallol, and other analytical grade chemicals were purchased from Aladdin (Shanghai, China). Myricetin, dihydroMyricetin, quercetin, resveratrol, apigenin, baicalein, hesperitin, gallic acid, rutin, luteolin, epicatechin, epicatechin gallate, and other standards for HPLC were purchased from Yuanye Bio-Technology (Shanghai, China). Cellulase (3, 000 μ/g) and pectinase (40, 000 μ/g) were purchased from Xiya reagent (Shandong, China). α-Glucosidase (G5003) and acetylcholinesterase (AChE, C3389) were purchased from Sigma-Aldrich (St. Louis, USA). p-Nitrophenol nitrophenol α-D-glycopyranoside (pNPG), acarbose, galantamine, and cisplatin were purchased from Sigma-Aldrich (St. Louis, MO, USA). The HepG2, MCF-7, Raw264.7, and A549 cells were purchased from Conservation genetics CAS Kunming cell bank.