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• W1964669988 endingPage "1980" @default.
• W1964669988 startingPage "1973" @default.
• W1964669988 abstract "This report describes a computer-aided CW- and pulsed-electron paramagnetic resonance (EPR) investigation on the structural modification of dimyristoylphosphatidylcoline (DMPC) vesicles, which occur upon interaction with starburst dendrimers (SBDs). Probes used for this study included doxyl-functionalized stearic acids, with the doxyl group attached at different positions of the stearic chain (5DXSA, 12DXSA, and 16DXSA). Mainly mobility and polarity parameters were evaluated from the analysis of the CW-EPR spectra, whereas the analysis of the decay and modulation of the electron spin−echo (ESE) signal provided information on the structural environment of the paramagnetic center. Due to the interaction with the SBD surface, the vesicle structure became more rigid and ordered. The enhanced rigidity of the structure also caused the tilting of the chains of about 50° with respect to the surface line. The permeability of water at the chain beginning level increased, thus increasing the rotational mobility of the probe. The perturbing effects lessened toward the end of the chains. A fraction of 16DXSA (15%) was in the bent conformation, with the chain inserted into the lipid layer and the two polar heads at the external surface. The interaction with protonated dendrimers caused the swelling of the vesicle structure. This study indicated that the bilayer structure is modified but only partially perturbed by the addition of the dendrimers, and the integrity of the vesicle, as a model cell membrane, is preserved after the interaction with the dendrimers. This is encouraging for the use of the SBDs as drug and gene carriers." @default.
• W1964669988 created "2016-06-24" @default.
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• W1964669988 date "1999-02-24" @default.
• W1964669988 modified "2023-09-27" @default.
• W1964669988 title "Structural Modifications of DMPC Vesicles upon Interaction with Poly(amidoamine) Dendrimers Studied by CW-Electron Paramagnetic Resonance and Electron Spin−Echo Techniques" @default.
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• W1964669988 doi "https://doi.org/10.1021/la9803068" @default.
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