Photon Emission by Natural Radical Scavengers in the Presence of Active Oxygen Species

  • Yumiko Yoshiki
  • Kazuyoshi Okubo
  • Kiharu Igarashi


The occurrence and intensity of photon emission were observed to be closely related to the partial structures of flavonoids. Photon emission P is suggested to be given by [P] = k [X] [Y] [Z]. The photon constants k of catechins and gallic acid in the presence of hydrogen peroxide as X and acetalde-hyde as Z were calculated from k 1 k 2, and k 3 of [P] = k 1 [X] [Y] f (z), [P] = k 2 [Y] [Z] f (x), and [P] = k 3 [X] [Z] f (y). k 1 showed greater differences depending on the structure of catechins than k 2 and k 3. The XYZ photon emission system is thought to consist of the transformation of energy. From the results of analysis by high-pressure liquid chromatography (HPLC) or antioxidative effects against lipid autoxidation, the XYZ system is suggested to be a scavenging mechanism of active oxygen species. DDMP (2,3-dihydro-2,5-dihydroxy-6-methyl-4H-pyran-4-one) saponin from soybean showed as strong an effect as Z in the presence of hydrogen peroxide and phenolic compounds. The XYZ system suggests that natural radical scavengers have various combinations for synergistic inhibition of the radical reactions.


Electron Spin Resonance Gallic Acid Photon Emission Active Oxygen Species Hydroxyl Radical Scavenge Activity 
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Copyright information

© Springer Japan 1997

Authors and Affiliations

  • Yumiko Yoshiki
    • 1
  • Kazuyoshi Okubo
    • 1
  • Kiharu Igarashi
    • 2
  1. 1.Department of Applied Biological Chemistry, Faculty of AgricultureTohoku UniversityAoba-ku, Sendai, Miyagi 981Japan
  2. 2.Department of Bioproduction, Faculty of AgricultureYamagata UniversityTsuruoka, Yamagata 997Japan

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