Superoxide- and 1,1-Diphenyl-2-picrylhydrazyl Radical-scavenging Activities of Soyasaponin β g Related to Gallic Acid | Zendy

Yumiko Yoshiki | Zendy; Takashi Kahara | Zendy; Kazuyoshi Ōkubo | Zendy; Terumi Sakabe | Zendy; Terumasa YAMASAKI | Zendy

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Superoxide- and 1,1-Diphenyl-2-picrylhydrazyl Radical-scavenging Activities of Soyasaponin β g Related to Gallic Acid

Author(s) -

Yumiko Yoshiki,

Takashi Kahara,

Kazuyoshi Ōkubo,

Terumi Sakabe,

Terumasa YAMASAKI

Publication year - 2001

Publication title -

bioscience biotechnology and biochemistry

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.509

H-Index - 116

eISSN - 1347-6947

pISSN - 0916-8451

DOI - 10.1271/bbb.65.2162

Subject(s) - gallic acid , chemistry , dpph , electronegativity , antioxidant , moiety , organic chemistry , stereochemistry

Soyasaponin beta p g at 1 mm had 8% scavenging activity for O2-, and 25 microM beta g scavenged 20.9% for the DPPH radical (IC50: 63.8 microM). 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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