title: Phenolics and antioxidant activity of mulberry leaves depend on cultivar and harvest month in Southern China.
abstract: To elucidate the effects of cultivar and harvest month on the phenolic content and antioxidant activity of mulberry leaves, four major phenolics, including chlorogenic acid (ChA), benzoic acid (BeA), rutin (Rut) and astragalin (Ast), were quantified using an HPLC-UV method. Leaves from six mulberry cultivars, collected from April to October, were analyzed. The antioxidant activity of mulberry leaves was assessed by ferric reducing antioxidant power (FRAP), hydroxyl radical scavenging activity (HSA) and superoxide radical scavenging activity (SSA) assays. The results showed that the total values of the four phenolic compounds ranged from 2.3 dry weight (DW) to 4.2 mg/g DW, with ChA being the major compound. The mean total phenol (TP) content of the six cultivars ranged from 30.4 equivalents (GAE) mg/g DW to 44.7 GAE mg/g DW. Mulberry leaves harvested in May had the highest TP content. Moreover, the antioxidant activities of mulberry leaves harvested from April to October differed noticeably. In general, Kq 10 and May were considered to be a better cultivar and harvest month concerning phenolic content and antioxidant activity, respectively.
authors: College of Food Science, South China Agricultural University, Guangzhou 510642, China. ymsun@scau.edu.cn.
authors: Yuxiao
authors: Y
authors: Zou
authors: Shentai
authors: S
authors: Liao
authors: Weizhi
authors: W
authors: Shen
authors: Fan
authors: F
authors: Liu
authors: Cuiming
authors: C
authors: Tang
authors: Chung-Yen Oliver
authors: CY
authors: Chen
authors: Yuanming
authors: Y
authors: Sun
mesh_terms: D000975:Antioxidants / Q000032:analysis*; D019817:Benzoic Acid / Q000032:analysis*; D002726:Chlorogenic Acid / Q000032:analysis*; D044949:Kaempferols / Q000032:analysis*; D031625:Morus / Q000737:chemistry* / Q000378:metabolism; D018515:Plant Leaves / Q000737:chemistry* / Q000378:metabolism; D012431:Rutin / Q000032:analysis*
chemical_list: D000975:Antioxidants; D044949:Kaempferols; D002726:Chlorogenic Acid; D012431:Rutin; D019817:Benzoic Acid; C001579:astragalin