Correlations Between the Motion and the Structure of Nonionic Surfactant Aggregates in Organic Solvents : Combined Studies by Carbon-13 Nuclear Magnetic Resonance and Neutron Scattering

Mathis, G.; Boubel, J-C.; Delpuech, Jean‐Jacques; Ravey, Jean-Claude; Buzier, M.

doi:10.1007/978-94-009-9079-1_59

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“…This is reasonable based on the mobility restriction of the molecule due to the micelle formation. Williams et al [39] and Mathis et al [40] also reported that amphiphilic molecules in aqueous medium showed faster segmental motion than in micelles. Levy et al reported a similar trend for the segmental motion of normal alkylammonium ions in aqueous media and organic solvents [41].…”

Section: Mobility Of Peo Segments On Liposomesmentioning

confidence: 94%

Mobility of Poly(Ethylene Oxide) Segments on Surface of Lecithin Liposomes

Morone¹,

Okumura²,

Sunamoto³

2001

Journal of Bioactive and Compatible Polymers

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To better understand the dynamics of PEO-lipid-modified phosphatidylcholine liposomes ("fusogenic liposomes"), the mobility of the PEO segment on the liposomal surface and the fluidity of the bilayer were investigated by measuring the spin-lattice relaxation time (T 1 ) by 13 C-NMR spectroscopy and by fluorescence depolarization. 13 C-NMR studies revealed that the PEO-lipids in this work exhibit similar behavior on liposomal surfaces irrespective of the PEO chain length. Furthermore, with regard to the relationship between morphology and dynamics of the PEO-lipid and phosphatidylcholine mixture, it was found that the mobility of PEO segments are altered by the morphology; liposome < aqueous micelle < monomeric dispersion in organic solution. Fluorescence depolarization studies revealed that liposomal membranes were tighter with the addition of PEO-lipid(12,a31) than with the addition of a13). In contrast, the reconstitution of PEO-lipid(12,a5) into liposomes increased membrane fluidity.

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Section: Mobility Of Peo Segments On Liposomesmentioning

confidence: 94%