Journal
BIOSCIENCE BIOTECHNOLOGY AND BIOCHEMISTRY
Volume 65, Issue 10, Pages 2162-2165Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1271/bbb.65.2162
Keywords
superoxide; 1,1-diphenyl-2-picrylhydrazyl radical; soyasaponin beta g; triterpenoid; Leguminosae
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Soyasaponin beta g at 1 mM had 8% scavenging activity for O-2(-), and 25 muM beta g scavenged 20.9% for the DPPH radical (IC50: 63.8 muM). In the soyasaponin beta g-gallic acid system, synerigistic effects were observed at a low level of gallic acid concentration. The spin density distribution calculated by the MNDO/AM1 method showed unpaired electron localization on the carbons at C-4 and C-6, and on the ketone group at C-4 of the DDMP moiety. Furthermore, for soyasaponin beta g, the MNDO/AM1 method gave an ionization potential of 8.38 eV, electron affinity of 1.16 eV and Mulliken electronegativity of 4.77 eV. Based on this evidence, the synergistic antiradical effects of the soyasaponin beta g-gallic acid system are assumed to involve two-electron reduction from gallic acid.
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