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Measurement of Local Sodium Ion Levels near Micelle Surfaces with Fluorescent Photoinduced‐Electron‐Transfer Sensors
Author(s) -
Uchiyama Seiichi,
Fukatsu Eiko,
McClean Gareth D.,
de Silva A. Prasanna
Publication year - 2016
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201509096
Subject(s) - micelle , fluorescence , chemistry , ion , membrane , selectivity , photoinduced electron transfer , molecule , electron transfer , photochemistry , sodium , organic chemistry , catalysis , aqueous solution , biochemistry , physics , quantum mechanics
The Na + concentration near membranes controls our nerve signals aside from several other crucial bioprocesses. Fluorescent photoinduced electron transfer (PET) sensor molecules target Na + ions in nanospaces near micellar membranes with excellent selectivity against H + . The Na + concentration near anionic micelles was found to be higher than that in bulk water by factors of up to 160. Sensor molecules that are not held tightly to the micelle surface only detected a Na + amplification factor of 8. These results were strengthened by the employment of control compounds whose PET processes are permanently “on” or “off”.