Polymerized phosphatidylcholine vesicles. Synthesis and characterization

Regen, Steven L.; Singh, Alok; Oehme, G.; Singh, Montek

doi:10.1021/ja00367a023

Cited by 185 publications

(107 citation statements)

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“…The stability of the initially prepared liposomes was evaluated by the well-established turbidity method reported several years ago (49,50). Thus in Fig.…”

Section: Stability Studiessupporting

confidence: 41%

“…Specifically the PC-CHOL liposomes were disrupted by the addition of about 25% (v/v) ethanol, while liposomes containing recognizable moieties were disrupted by the addition of 40-50% (v/v) ethanol. Since normally the addition of ethanol leads to a decrease of absorbance (49,50), the observed enhancement of absorbance due to the disruption of the liposomes can only be attributed to the liberation of cholesterol crystallites. The latter remain dispersed in the resulting water/ethanol mixture, giving rise to the increased absorbance.…”

Section: Stability Studiesmentioning

confidence: 45%

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Complementary Liposomes Based on Phosphatidylcholine: Interaction Effectiveness vs Protective Coating

Pantos

Sideratou

Paleos

2002

Journal of Colloid and Interface Science

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“…The stability of the initially prepared liposomes was evaluated by the well-established turbidity method reported several years ago (49,50). Thus in Fig.…”

Section: Stability Studiessupporting

confidence: 41%

Section: Stability Studiesmentioning

confidence: 45%

Complementary Liposomes Based on Phosphatidylcholine: Interaction Effectiveness vs Protective Coating

Pantos

Sideratou

Paleos

2002

Journal of Colloid and Interface Science

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“…The liquid crystal textures are changed greatly by deformation. If the polymerizable group is introduced in the hydrophobic part of the amphiphile, the local molecular mobility of the long dodecanoyl group is notably limited and the texture of the liquid crystal is likely more rigid [19]. DSC heating curve of the polymer PADM shows a broad endothermic peak in a relatively wide temperature range, 0 -20 ~ This peak seems to be attributed to a glass transition, considering that PADM shows a typical viscoelastic behavior in a transition from a glassy state to a rubbery state in the temperature range of i -10 ~ (see Fig.…”

Section: Viscoelasticity and Morphologymentioning

confidence: 46%

Morphology and viscoelasticity of bilayer aqueous colloids of low-molecular and macromolecular amphiphiles

Matsumoto

Heiuchi

Horie

1989

Colloid & Polymer Sci

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Aqueous colloids of didodecytdimethylammonium bromide (DMA), allylbis[2-(dodecanoyloxycarbonyl)ethyl] methylammonium bromide (ADM) and polymer of ADM (PADM) were employed for morphological and rheological studies.The polymerization was carried out by irradiation of UV-light for the monomeric colloid. Weight average molecular weight of the polymer is about 16.3 x 104.Diameters of vesicles at critical micelle (aggregate) concentration were 8 -10 nm in the aqueous colloids of DMA, ADM and PADM. Various bilayer textures which were dependent upon the concentration and the temperature could be found in these amphiphiles. In particular, the bilayer textures were full in variety in the PADM system.Rheological properties of the aqueous colloids of these amphiphiles depended strongly upon the bilayer textures.

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“…It was also observed that the emission intensity of NBD-DPPE did not change upon the addition of a solution of the detergent Triton X-100 (TX-100), which is widely used as an agent for lysing lipid membranes. [5,35] Previous work has…”

mentioning

confidence: 43%

Monodisperse Polyelectrolyte‐Supported Asymmetric Lipid‐Bilayer Vesicles

Katagiri

Caruso²

2005

Advanced Materials

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Cataposit 44 (Shipley) in water. After 10 min the fibers were recovered by filtration and suspended in a wash solution of Cataprep 404. Filtration was repeated and followed with 4 washes with 1 L of water. The final filter cake was freeze-dried to yield a fine light-gray powder. The electroless copper-plating bath was Fidelity 1025. Dry fibers were added at the concentrations specified in the text and subjected to continuous stirring. Once exhausted the reaction mixture was filtered, and the fibers washed copiously with water and freeze-dried.Absolute density was determined by water displacement. A known mass of fibers was placed in a pre-weighed graduated cylinder. Water was added to a total known volume (bubbles were removed by subjecting the cylinder to vacuum). The volume of water was determined by re-weighing the cylinder. The volume occupied by the fibers was determined by subtracting the volume of water from the total volume.An approximation of the conductivity of the metal plated onto cellulose was determined by use of a Spectra/Por cellulose membrane (Spectrum) as a surrogate material. Measurement of the conductivity of individual fibers is impractical, and the conductivity of bulk fiber is dominated by contact resistance. A membrane of 10 mm width and 8.5 cm long was plated with electroless copper essentially as described above. The final thickness was 30.5 lm, with a copper layer on both sides of less than 100 nm (as determined by weight gain). The resistance of this membrane was 3.5 X, which corresponds to a conductivity of 8.1 10 5 X ±1 m ±1 . Sample composites were fabricated by adding the requisite mass of fibers to polyurethane LS-40 (BJB Enterprises) to yield the desired volume percentage. Moldings were made between two flat plates, with shims to determine the thickness. Samples were cured for 24 h at room temperature. Electromagnetic measurements were conducted with a Hewlett-Packard 8510 Network Analyzer and permittivities were calculated by the Nicholson-Ross technique [14]. Samples were 1.27 mm thick and toroidal, with an inner diameter of 3 mm and an outer diameter of 7 mm and measured in a coaxial cable arrangement.DC conductivity of the composites was measured across the thickness of the samples (1.27 mm) between metal plates of 5 cm by 1.8 cm in dimension. Measurements were made with a Keithley 194 A Digital Multimeter. The limit of detection was approximately 3 10 ±10 X ±1 m ±1 .

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Polymerized phosphatidylcholine vesicles. Synthesis and characterization

Cited by 185 publications

References 0 publications

Complementary Liposomes Based on Phosphatidylcholine: Interaction Effectiveness vs Protective Coating

Complementary Liposomes Based on Phosphatidylcholine: Interaction Effectiveness vs Protective Coating

Morphology and viscoelasticity of bilayer aqueous colloids of low-molecular and macromolecular amphiphiles

Monodisperse Polyelectrolyte‐Supported Asymmetric Lipid‐Bilayer Vesicles

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