@misc{oai:repo.qst.go.jp:00070334,
 author = {Matsumoto, Kenichiro and Nakanishi, Ikuo and Krishna, Murali and 松本 謙一郎 and 中西 郁夫},
 month = {Nov},
 note = {Nitroxyl radicals were utilized as redox probe in a field of in vivo EPR spectroscopy and imaging. Recently, utility of nitroxyl radicals as redox sensitive contrast agents for functional MRI were proposed and were getting interests. Detail reaction of nitroxyl radicals with each biological molecule, such as glutathione (GSH), were however not enough investigated. We have investigated temperature dependent reaction of nitroxyl radical with coexisting GSH. GSH can react with 2 molecules of a nitroxyl radical, and can eliminate EPR signal completely. Addition of K3Fe(CN)6 to the reaction mixture can not recover EPR signal of nitroxyl radical after the reaction with GSH. In this study, pH dependence of reduction of several nitroxyl radicals (TEMPO, TEMPOL, TEMPONE, carboxy-PROXYL, and carbamoyl-PROXYL) with coexisting glutathione at 37[deg]C was tested. The decay profiles of nitroxyl radicals were depending on pH. The reduction of nitroxyl radicals become faster in pH6 compared with pH7, except carboxy-PROXYL was not react in lower pH. Almost no reduction of nitroxyl radicals occurred in pH8. However, mechanism of reaction of nitroxyl radical and GSH is still in progress., SFRBM's 17th Annual Meeting/SFRRI's XV Biennial Meeting},
 title = {Reaction of nitroxyl radicals and GSH; pH deendence},
 year = {2010}
}