
Proceedings Paper • Open Access
Fluorescent molecular probes based on excited state prototropism in lipid bilayer membrane
Paper Abstract
Excited state prototropism (ESPT) is observed in molecules having one or more ionizable protons, whose proton
transfer efficiency is different in ground and excited states. The interaction of various ESPT molecules like naphthols
and intramolecular ESPT (ESIPT) molecules like hydroxyflavones etc. with different microheterogeneous media have
been studied in detail and excited state prototropism as a probe concept has been gaining ground. The fluorescence of
different prototropic forms of such molecules, on partitioning to an organized medium like lipid bilayer membrane,
often show sensitive response to the local environment with respect to the local structure, physical properties and
dynamics. Our recent work using 1-naphthol as an ESPT fluorescent molecular probe has shown that the incorporation
of monomeric bile salt molecules into lipid bilayer membranes composed from dipalmitoylphosphatidylcholine (DPPC,
a lung surfactant) and dimyristoylphosphatidylcholine (DMPC), in solid gel and liquid crystalline phases, induce
appreciable wetting of the bilayer up to the hydrocarbon core region, even at very low (≤ 1 mM) concentrations of the
bile salts. The incorporation and location of fisetin, an ESIPT molecule having antioxidant properties, in lipid bilayer
membrane has been sensitively monitored from its intrinsic fluorescence behaviour.
Paper Details
Date Published: 2 February 2012
PDF: 10 pages
Proc. SPIE 8233, Reporters, Markers, Dyes, Nanoparticles, and Molecular Probes for Biomedical Applications IV, 823309 (2 February 2012); doi: 10.1117/12.910655
Published in SPIE Proceedings Vol. 8233:
Reporters, Markers, Dyes, Nanoparticles, and Molecular Probes for Biomedical Applications IV
Samuel Achilefu; Ramesh Raghavachari, Editor(s)
PDF: 10 pages
Proc. SPIE 8233, Reporters, Markers, Dyes, Nanoparticles, and Molecular Probes for Biomedical Applications IV, 823309 (2 February 2012); doi: 10.1117/12.910655
Show Author Affiliations
Monalisa Mohapatra, Indian Institute of Technology Madras (India)
Ashok K. Mishra, Indian Institute of Technology Madras (India)
Published in SPIE Proceedings Vol. 8233:
Reporters, Markers, Dyes, Nanoparticles, and Molecular Probes for Biomedical Applications IV
Samuel Achilefu; Ramesh Raghavachari, Editor(s)
© SPIE. Terms of Use
