Abstract
The active oxygen scavenging activities of katsuo-dashi were investigated. The fractions that were separated by porous-polymer resin and such compounds as anserine（Ans）, histidine（His）and creatinine（Crn）were also identified. The superoxide-anion, hydroxyl radical, singlet oxygen and peroxyl radical were used as active oxygen species. Katsuo-dashi and the fraction non-adsorbed to the resin scavenged all four active oxygen species. Creatinine strongly scavenged the superoxide anion. This result indicates that creatinine could stop the continuous reaction following the hydroxyl radical. Ans and His strongly scavenged the hydroxyl radical, singlet oxygen and peroxyl radical.
