title: Isolation, characterisation, and antioxidant activities of flavonoids from chufa (Eleocharis tuberosa) peels.
abstract: In this paper, chufa peels (Eleocharis tuberosa) were researched for the flavonoid profile for the first time. Twenty flavonoids were isolated and identified, including six new ones, named eleocharins A-F (1-6). Their structures were characterised by spectroscopic methods and compared with published data. The antioxidant activity of the acetone extract, EtOAc fraction, and nBuOH fraction of chufa peels as well as the isolated flavonoids were assessed by 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical bioassay. The results showed that chufa peels can be regarded as an excellent source of natural antioxidants (mainly flavonoids) and a good additive in the beverage and canning.
authors.affiliation: Province Key Laboratory of Characteristic Resources Development and Utilization Research in East Guangxi, Hezhou University, Hezhou 542899, People's Republic of China; State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650204, People's Republic of China.
authors.forename: Yanghe
authors.initials: Y
authors.lastname: Luo
authors.affiliation: Province Key Laboratory of Characteristic Resources Development and Utilization Research in East Guangxi, Hezhou University, Hezhou 542899, People's Republic of China.
authors.forename: Xingren
authors.initials: X
authors.lastname: Li
authors.affiliation: State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650204, People's Republic of China.
authors.forename: Juan
authors.initials: J
authors.lastname: He
authors.affiliation: State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650204, People's Republic of China.
authors.forename: Jia
authors.initials: J
authors.lastname: Su
authors.affiliation: State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650204, People's Republic of China.
authors.forename: Liyan
authors.initials: L
authors.lastname: Peng
authors.affiliation: State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650204, People's Republic of China.
authors.forename: Xingde
authors.initials: X
authors.lastname: Wu
authors.affiliation: State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650204, People's Republic of China.
authors.forename: Runan
authors.initials: R
authors.lastname: Du
authors.affiliation: State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650204, People's Republic of China. Electronic address: qinshizhao@mail.kib.ac.cn.
authors.forename: Qinshi
authors.initials: Q
authors.lastname: Zhao
mesh_terms: D000975:Antioxidants / Q000032:analysis*; D001713:Biphenyl Compounds / Q000737:chemistry; D031256:Eleocharis / Q000737:chemistry*; D005419:Flavonoids / Q000032:analysis*; D010851:Picrates / Q000737:chemistry; D010936:Plant Extracts / Q000032:analysis*
chemical_list: D000975:Antioxidants; D001713:Biphenyl Compounds; D005419:Flavonoids; D010851:Picrates; D010936:Plant Extracts; C004931:1,1-diphenyl-2-picrylhydrazyl
keywords: Antioxidant activity; Chufa peels; DPPH assay; Eleocharis tuberosa; Flavonoids