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Published on: January 5, 2015
Design of liposome-based pH sensitive nanoSPIN probes: nano-sized particles with incorporated nitroxides
Yakov Y Woldman1, Sergey V Semenov, Andrey A Bobko
1The Ohio State University Medical Center, Columbus, 43210, USA.
Abstract:
Liposome-based nanoSized Particles with Incorporated Nitroxides, or nanoSPINs, were designed for EPR applications as pH probes in biological systems. Phospholipid membrane of the liposomes with incorporated gramicidin A showed selective permeability to a small analyte, H(+), while protecting entrapped sensing nitroxide from biological reductants. An application of the pH-sensitive nanoSPIN in an ischemia model in rat heart homogenate allows for monitoring ischemia-induced acidosis while protecting encapsulated nitroxide against bioreduction.

