@article{oai:repo.qst.go.jp:00047125,
 author = {Waki, Tsukasa and Kobayashi, Shigeki and Matsumoto, Kenichiro and Ozawa, Toshihiko and Kamada, Tadashi and Nakanishi, Ikuo and 和氣 司 and 松本 謙一郎 and 鎌田 正 and 中西 郁夫},
 issue = {84},
 journal = {Chemical Communications},
 month = {Aug},
 note = {Mg(2+) enhanced the scavenging activity of (+)-catechin and quercetin against the 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical, while Al(3+) decreased their activity.  Such effects of Mg(2+) and Al(3+) were not observed for kaempferol.  Na(+) and Ca(2+) with large ionic radii showed little effect on the DPPH radical-scavenging activity of these three flavonoids.},
 pages = {9842--9844},
 title = {Effects of Ionic Radius of  Redox-Inactive Bio-Related Metal Ions on the Radical-Scavenging Activity of Flavonoids Evaluated Using Photometric Titration},
 volume = {49},
 year = {2013}
}