Differences between Singlet Ozygen and H2O2 Scavenging Activities among Various Organs of Common and Tartary Buckwheats
The resistance to oxidation caused by light irradiation was investigated among different organs in common and Tartary buckwheats. The scavenging activities of hydrogen peroxide and singlet oxygen produced by UV or strong photosynthetic active radiation were evaluated by photon counting of visible light using chemiluminescence．A second method of evaluation Was the time．resolved photon counting of near-infrared induced by YAG laser. In each species, the leaf, stem, flowe~aIld seed were separated at early and late stages of the flowering period, and were dried and ground into flour．Hot water extracts of the flowers had a shorter lifetime for singlet oxygen than that of the leaf, stem, and fruit extracts for both species．Scavenging activities of H2O2 in the leaf and flower samples were higher than other organs in each species and those in common buckwheat were higher compared with Tartary buckwheat. There was a sigmficant negative correlation between the singlet oxygen lifetime and the scavenging activity of H2O2. The flower has a higher antioxidant activity than other organs in each buckwheat species due to the presence of water soluble compounds．
Antiozidant activity Hydrogen perozide Light stress Pigment Singlet ozygen
Naoto Inoue Seiko Hirakawa Kaori Fujita Shin-ya Kasajima Rezwanul Mahmud
Faculty of Agriculture, Shinshu University, Minamiminowa, Nagano 399-4598, Japan National Food Research Institute, Kannondai 2-1-12, Tsukuba, Ibaraki 305-8642, Japan
国际会议
The 10th International Symposium on Buckwheat(第十届国际荞麦会议)
陕西杨凌
英文
247-251
2007-08-14（万方平台首次上网日期，不代表论文的发表时间）