In several recent publications on pyocyanine, its mechanism of action has been attributed to an ability to react with nitric oxide (NO), resulting in the formation of an adduct. We examined the chemical interaction of pyocyanine and NO using electrospray (ES) MS, spectrophotometry and voltammetry at neutral pH and with 10Ő100 ƁM pyocyanine. No binding of NO to pyocyanine was observed. Alternative mechanisms for the inhibition of NO-induced vasorelaxation by pyocyanine should be sought.

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