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2 February 2012 Fluorescent molecular probes based on excited state prototropism in lipid bilayer membrane
Monalisa Mohapatra, Ashok K. Mishra
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Proceedings Volume 8233, Reporters, Markers, Dyes, Nanoparticles, and Molecular Probes for Biomedical Applications IV; 823309 (2012) https://doi.org/10.1117/12.910655
Event: SPIE BiOS, 2012, San Francisco, California, United States
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.
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Monalisa Mohapatra and Ashok K. Mishra "Fluorescent molecular probes based on excited state prototropism in lipid bilayer membrane", Proc. SPIE 8233, Reporters, Markers, Dyes, Nanoparticles, and Molecular Probes for Biomedical Applications IV, 823309 (2 February 2012); https://doi.org/10.1117/12.910655
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KEYWORDS
Luminescence
Molecules
Compound parabolic concentrators
Molecular interactions
Seaborgium
Bioalcohols
Interfaces
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