Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/69383
標題: Antioxidants in aerial parts of Hypericum sampsonii, Hypericum japonicum and Hypericum perforatum
作者: Chen, C.L.
Huang, C.H.
Sung, J.M.
關鍵字: Antioxidant
drying
Hypericum japonicum
Hypericum perforatum
Hypericum sampsonii
superoxide-dismutase activity
radical absorbency capacity
hydrogen-peroxide
oxidative stress
ascorbic-acid
extracts
glutathione
plants
chloroplasts
vegetables
期刊/報告no:: International Journal of Food Science and Technology, Volume 44, Issue 11, Page(s) 2249-2255.
摘要: P>Antioxidants contents and antioxidative enzymes and their activities in fresh aerial tissues of Hypericum sampsonii (Sampson's St John's Wort), Hypericum japonicum (Japanese St John's Wort) and Hypericum perforatum were investigated. Hypericum sampsonii contained more total ascorbate [34.33 mu mol g-1 fresh weight (FW)] than H. perforatum (57% less) and H. japonicum (82% less). It also contained more thiol and phenolics than two other species. Hypericum japonicum had highest superoxide dismutase (SOD) activity (8.74 mmol min-1 g-1 FW), followed by H. sampsonii (2% less) and H. perforatum (37% less). Hot-air dried H. perforatum materials contained more thiol [208.7 mu mol g-1 dry weight (DW)] and phenolics (352.82 mg g-1 DW) than freeze-dried and fresh materials. Both drying treatments decreased the activities of antioxidative enzymes in aerial tissues of H. perforatum. However, freeze-dried H. perforatum contained the highest SOD activity (5.42 mmol min-1 g-1 DW) among the antioxidative enzymes measured from both freeze-dried and hot-air dried tissues (ranged from 0.02 to 2.65 mu mol min-1 g-1 DW).
URI: http://hdl.handle.net/11455/69383
ISSN: 0950-5423
文章連結: http://dx.doi.org/10.1111/j.1365-2621.2009.02066.x
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