Ascorbic acid vc

[2,2′-azino-bis-(3-ethylbenzo-thiazoline-6-sulfonic acid)] (ABTS free radical), D-galactose and ascorbic acid (VC) were received from Solarbio Science and Technology Co., Ltd. (Beijing, China). LC grade acetonitrile was supplied by Thermo Fisher Scientific Inc. (USA). Caffeic and rosmarinic acids standards were purchased from SIGMA-ALDRICH Co., Ltd. (USA). Ferulic acid was purchased from Yuanye Biotechnology Co., Ltd. (Shanghai, China). 2,2′-diphenyl-1-picrylhydrazyl (DPPH free radical) was purchased from TCI Development Co., Ltd. (Shanghai, China). The biochemical assay kits used for determination of superoxide dismutase (SOD), malondialdehyde (MDA), catalase (CAT) and glutathione peroxidase (GSH-px) were received from Elabscience Biotechnology Co., Ltd. (Wuhan, China). All the chemicals used in the study were of analytical grade.

P. chinense leaves were obtained from Gulin, Luzhou, Sichuan, China. Bovine serum albumin (BSA), galacturonic acid, glucose, T-series dextran standards, standard monosaccharides, Sephadex G-200, ascorbic acid (V_C), 2,2′-Azinobis-(3-ethylbenzthiazoline-6-sulphonate) (ABTS), and a total phenol assay kit were purchased from Solarbio Science & Technology Co., Ltd. (Beijing, China). Calcium chloride (CaCl₂), sodium chloride (NaCl), salicylic acid, 2,2-Diphenyl-1-picrylhydrazyl (DPPH), potassium ferricyanide, ferric chloride (FeCl₃), and ferrous sulfate (FeSO₄) were supplied by Macklin Biotechnology Co., Ltd. (Shanghai, China). All other reagents utilized were of analytical grade.