title: Phenolic compositions and antioxidant attributes of leaves and stems from three inbred varieties of Lycium chinense Miller harvested at various times.
abstract: Antioxidant components and properties (assayed by scavenging DPPH radicals, TEAC, reducing power, and inhibiting Cu(2+)-induced human LDL oxidation) of leaves and stems from three inbred varieties of Lycium chinense Miller, namely ML01, ML02 and ML02-TY, harvested from January to April were studied. Their flavonoid and phenolic acid compositions were also analyzed by HPLC. For each variety, the leaves and stems collected in higher temperature month had higher contents of total phenol, total flavonoid and condensed tannin. Contents of these components in the samples collected in different months were in the order: April (22.3°C)>March (18.0°C)>January (15.6°C)>February (15.4°C). Antioxidant activities of the leaves and stems for all assays also showed similar trends. The samples from different varieties collected in the same month also possessed different phenolic compositions and contents and antioxidant activities. Their antioxidant activities were significantly correlated with flavonoid and phenolic contents.
authors.affiliation: Department of Health Diet and Industry Management, Chung Shan Medical University, and Department of Nutrition, Chung Shan Medical University Hospital, 110, Sec. 1, Jianguo N. Road, Taichung City 40201, Taiwan.
authors.forename: Shih-Chuan
authors.initials: SC
authors.lastname: Liu
authors.affiliation: Department of Medical Applied Chemistry, Chung Shan Medical University, and Department of Medical Education, Chung Shan Medical University Hospital, 110, Sec. 1, Jianguo N. Road, Taichung City 40201, Taiwan.
authors.forename: Jau-Tien
authors.initials: JT
authors.lastname: Lin
authors.affiliation: Department of Health Diet and Industry Management, Chung Shan Medical University, and Department of Nutrition, Chung Shan Medical University Hospital, 110, Sec. 1, Jianguo N. Road, Taichung City 40201, Taiwan.
authors.forename: Chao-Chin
authors.initials: CC
authors.lastname: Hu
authors.affiliation: Department of Health Diet and Industry Management, Chung Shan Medical University, and Department of Nutrition, Chung Shan Medical University Hospital, 110, Sec. 1, Jianguo N. Road, Taichung City 40201, Taiwan.
authors.forename: Bo-Yan
authors.initials: BY
authors.lastname: Shen
authors.affiliation: Department of Medical Applied Chemistry, Chung Shan Medical University, and Department of Medical Education, Chung Shan Medical University Hospital, 110, Sec. 1, Jianguo N. Road, Taichung City 40201, Taiwan.
authors.forename: Ting-Yo
authors.initials: TY
authors.lastname: Chen
authors.affiliation: Miaoli District Agricultural Research and Extension Station, Council of Agricultural, Executive Yuan, 261, Guannan, Gongguan Township, Miaoli County 36346, Taiwan.
authors.forename: Ya-Ling
authors.initials: YL
authors.lastname: Chang
authors.affiliation: Miaoli District Agricultural Research and Extension Station, Council of Agricultural, Executive Yuan, 261, Guannan, Gongguan Township, Miaoli County 36346, Taiwan.
authors.forename: Chia-Huing
authors.initials: CH
authors.lastname: Shih
authors.affiliation: Department of Health Diet and Industry Management, Chung Shan Medical University, and Department of Nutrition, Chung Shan Medical University Hospital, 110, Sec. 1, Jianguo N. Road, Taichung City 40201, Taiwan; Department of Nutrition, China Medical University, 91, Hsueh-Shih Road, Taichung 40402, Taiwan. Electronic address: djyang1@gmail.com.
authors.forename: Deng-Jye
authors.initials: DJ
authors.lastname: Yang
mesh_terms: D000975:Antioxidants / Q000032:analysis*; D002851:Chromatography, High Pressure Liquid; D005419:Flavonoids / Q000032:analysis; D032305:Lycium / Q000737:chemistry*; D010636:Phenols / Q000032:analysis*; D010936:Plant Extracts / Q000737:chemistry*; D018515:Plant Leaves / Q000737:chemistry*; D018547:Plant Stems / Q000737:chemistry*
chemical_list: D000975:Antioxidants; D005419:Flavonoids; D010636:Phenols; D010936:Plant Extracts
keywords: Antioxidant activity; Harvest time; Lycium chinense Miller; Phenolic composition