title: Seasonal dynamics of total flavonoid contents and antioxidant activity of Dryopteris erythrosora.
abstract: The seasonal dynamics of the total flavonoid contents in various parts of Dryopteris erythrosora, a traditional Chinese medicinal fern, and their antioxidant activity were investigated. The total flavonoids content in various parts of D. erythrosora showed an obvious seasonal dynamic change. The total flavonoid contents in stems (from 4.3% to 12.5%) were much higher than that in leaves with an average content of 2.01%. In spring, the total flavonoid contents in stems were relatively low, but increased rapidly from summer to winter. However, the seasonal dynamics of total flavonoid contents in leaves showed different model. The total flavonoid contents in the stems showed a negative correlation with that in the leaves from January to July. The correlation coefficient of about -0.7 was obtained. The antioxidant activity of the extracts also altered in proportion to the change of total flavonoid contents. In general, the extracts from stems always showed highest antioxidant potentials and it was suggested that the stems can be used as crude medicine.
authors.affiliation: Department of Biology, Shanghai Normal University, 100 Guilin Rd, Shanghai 200234, China.
authors.forename: Yinghua
authors.initials: Y
authors.lastname: Xie
authors.affiliation: Department of Biology, Shanghai Normal University, 100 Guilin Rd, Shanghai 200234, China.
authors.forename: Yunxia
authors.initials: Y
authors.lastname: Zheng
authors.affiliation: Department of Biology, Shanghai Normal University, 100 Guilin Rd, Shanghai 200234, China.
authors.forename: Xiling
authors.initials: X
authors.lastname: Dai
authors.affiliation: Department of Biology, Shanghai Normal University, 100 Guilin Rd, Shanghai 200234, China.
authors.forename: Quanxi
authors.initials: Q
authors.lastname: Wang
authors.affiliation: Department of Biology, Shanghai Normal University, 100 Guilin Rd, Shanghai 200234, China. Electronic address: cao101@shnu.edu.cn.
authors.forename: Jianguo
authors.initials: J
authors.lastname: Cao
authors.affiliation: Department of Biology, Shanghai Normal University, 100 Guilin Rd, Shanghai 200234, China; Research Center of Bio-separation Engineering Technology, Anhui Academy of Applied Technology, Suixi Road 312, Hefei, Anhui 230031, China. Electronic address: jianboxiao@yahoo.com.
authors.forename: Jianbo
authors.initials: J
authors.lastname: Xiao
mesh_terms: D000975:Antioxidants / Q000737:chemistry*; D032492:Dryopteris / Q000737:chemistry* / Q000254:growth & development; D005419:Flavonoids / Q000737:chemistry*; D010084:Oxidation-Reduction; D010936:Plant Extracts / Q000737:chemistry*; D018515:Plant Leaves / Q000737:chemistry / Q000254:growth & development; D012621:Seasons
chemical_list: D000975:Antioxidants; D005419:Flavonoids; D010936:Plant Extracts
keywords: Antioxidant activities; Dryopteris erythrosora; Flavonoids; Habitats