Journal ArticleDOI
Intramolecular excimer fluorescence: a new probe of phase transitions in synthetic phospholipid membranes
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TLDR
In this paper, the 1,1'-dipyrenyl)-methyl ether [Dipyme showed intramolecular excimer fluorescence in competition with fluorescence from locally excited pyrene chromophore.Abstract:
— The molecule (1,1'-dipyrenyl)-methyl ether [dipyme] shows intramolecular excimer fluorescence in competition with fluorescence from the locally excited pyrene chromophore. This intensity ratio Ic/Im is sensitive to solvent viscosity. The molecule is soluble in synthetic phospholipid membranes. 1H NMR studies suggest that the molecule is localized in the hydrocarbon region of the membrane. Fluorescence measurements at various temperatures of dipyme dissolved in these membranes show that Ic/Im is exceedingly sensitive to fluidity changes accompanying both the pretransitions and the gel to liquid crystalline transitions of the membrane. These studies can be carried out at a mole ratio of probe to lipid 102-103 smaller than that necessary to observe bimolecular pyrene excimer formation.read more
Citations
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Poly(ethylene oxide)-poly(propylene oxide )-poly (ethylene oxide) block copolymer surfactants in aqueous solutions and at interfaces: thermodynamics, structure, dynamics, and modeling
TL;DR: In this article, the association properties of poly(ethylene oxide)-block-poly(propyleneoxide)-blockpoly(methylene oxide) (PEO) copolymers in aqueous solutions, and the adsorption at interfaces are reviewed.
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THE Py SCALE OF SOLVENT POLARITIES. SOLVENT EFFECTS ON THE VIBRONIC FINE STRUCTURE OF PYRENE FLUORESCENCE and EMPIRICAL CORRELATIONS WITH ET and Y VALUES
Dao Cong Dong,Mitchell A. Winnik +1 more
TL;DR: In this paper, the I1/I3 values for pyrene fluorescence are suggested as the basis for a new empirical scale of solvent polarity, called the Py scale, which offers certain conveniences over other scales of solvent polarities.
Journal ArticleDOI
Fluorescence methods in the study of the interactions of surfactants with polymers
TL;DR: A review of the application of fluorescence techniques to study polymer-surfactant systems can be found in this article, where various methods and materials in use are discussed, with particular emphasis on the study of the complexes formed between surfactants and hydrophobically-modified polymers.
Journal ArticleDOI
Investigation of human erythrocyte ghost membranes with intramolecular excimer probes
TL;DR: Human erythrocyte ghost membranes have been investigated using two intramolecular excimer probes, di( 1-pyrenyl)propane and di(1- pyrenylmethyl) ether, and the polarizability of the probe surroundings can be determined, leading to a surprisingly high value for the apparent refractive index.
Journal ArticleDOI
Fate of excited probes in micellar systems.
TL;DR: Studies on the photophysical and photochemical behavior of probes within micellar systems: organized emulsifier/polymer aggregates; the intra- and interpolymer association of amphiphilic polymers; monomer-swollen micelles (microdroplets); and the interfacial layer are presented.
References
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Chromatographically homogeneous lecithin from egg phospholipids.
TL;DR: The modified method involved application of crude egg phosphatides to a column of alumina in the proportion of 1 g phosphatide/25 g alumina, and elution of the lecithin fraction with the 2-component solvent system chloroform:methanol, 9:1 by vol.
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Lateral phase separation in phospholipid membranes.
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Physical studies of phospholipids. VI. Thermotropic and lyotropic mesomorphism of some 1,2-diacyl-phosphatidylcholines (lecithins)
TL;DR: The thermotropic and lyotropic mesomorphism of saturated 1,2-diacyl-L-phosphatidylcholines (lecithins) has been studied by light microscopy, differential thermal analysis, X-ray diffraction, infrared and nuclear magnetic resonance spectroscopy.
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Intramolecular Excimer Formation. I. Diphenyl and Triphenyl Alkanes
TL;DR: In this article, a class of compounds which are so structured that the phenyl groups along a main alkane chain are separated by exactly three carbon atoms, e.g., 1,3-diphenylpropane, 1, 3,5-triphenylpentane, has been found to possess unique fluorescence characteristics.