量研学術機関リポジトリ「QST-Repository」は、国立研究開発法人 量子科学技術研究開発機構に所属する職員等が生み出した学術成果（学会誌発表論文、学会発表、研究開発報告書、特許等）を集積しインターネット上で広く公開するサービスです。 Welcome to QST-Repository where we accumulates and discloses the academic research results(Journal Publications, Conference presentation, Research and Development Report, Patent, etc.) of the members of National Institutes for Quantum Science and Technology.
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A 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical is relatively stable at room temperature and has been used as a reactivity model of reactive oxygen species. However, the insolubility of the DPPH radical in water has precluded its use in aqueous media without organic cosolvents, such as ethanol. Recently, we have succeeded in solubilizing the DPPH radical in water using beta-cyclodextrin. This enables us to evaluate the radical-scavenging activity of water-soluble antioxidants in aqueous media, particularly in physiological concentrations of buffer solutions, with use of the same probe, the DPPH radical as that has been used in organic solvents for 60 years.
EVALUATION OF THE RADICAL-SCAVENGING ACTIVITY OF ANTIOXIDANTS IN WATER USING A WATER-SOLUBILIZED 2,2-DIPHENYL-1-PICRYLHYDRAZYL RADICAL
