Novel Lipid Nanotubes in Dispersions of DMPC

Lauf, Ulrike; Fahr, Alfred; Westesen, Kirsten; Ulrich, Anne S.

doi:10.1002/cphc.200400235

Cited by 25 publications

(18 citation statements)

References 16 publications

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“…i) The observed first step for the formation of the tubes, i.e., the formation of the necklaces from spherical vesicles, is similar to the mechanism proposed by Lauf et al [24] for the formation of tubular vesicles by 1,2-dimyristoyl-sn-glycero-3-phosphatidylcholine (DMPC). These authors have proposed that the tube formation is based on a stepwise fusion of small unilamellar vesicles, which relaxes local defects and allows ripple formation.…”

mentioning

confidence: 56%

Supramolecular Structures Generated by a p‐tert‐Butylphenyl‐amide Derivative of Cholic Acid: From Vesicles to Molecular Tubes

et al. 2007

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The formation of supramolecular structures initiated by a p‐tert‐butylphenyl‐amide derivative of cholic acid is investigated. The initial spherical vesicles, with a rather low effective bending constant, collapse into necklaces that self‐transform into tubules of small diameter. Finally, molecular tubes are generated (see figure). During the process, the geometrical constraints of fixed surface area and fixed enclosed volume are obeyed.

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confidence: 56%

Supramolecular Structures Generated by a p‐tert‐Butylphenyl‐amide Derivative of Cholic Acid: From Vesicles to Molecular Tubes

et al. 2007

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“…The SPB formation 34 [2] 183-188 (2009) Transaction of the Materials Research Society of Japanfrom the vesicles easily proceeded on the substrates with weaker attractive energy, e.g. mica and glass, while the intact vesicular layer formed on TiO 2 , which has stronger attractive interaction with the bilayer, due to the large van der Waals energy.…”

Section: Discussionmentioning

confidence: 99%

“…34 [2] 183-188 (2009) surface. The interaction energy between the substrates and the bilayer, which was evaluated from van der Waals energy using rigorously calculated Hamaker constant and hydration forces, showed that the adsorption energy of the bilayer on TiO 2 is 10 times larger than that on SiO 2 and mica.…”

Section: Transaction Of the Materials Research Society Of Japanmentioning

confidence: 99%

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Shape Transformation of Adsorbed Vesicles on Oxide Surfaces: Effect of Substrate Material and Photo-Irradiation

Tero

Ujihara

Urisu

2009

Trans. Mat. Res. Soc. Japan

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Shape transformation of phospholipid vesicles on oxide surfaces was investigated by a fluorescence microscope. The transformation of spherical vesicles to a planar lipid bilayer membrane spontaneously proceeded on mica and glass, while the intact vesicular layer formed on TiO 2 . Interaction energy between the substrate and the bilayer, which was evaluated using the rigorously calculated Hamaker constant, was ~10 times larger on TiO 2 than on mica and SiO 2 . The results seems inconsistent with the conventionally proposed adhesion induced tension model, in which stronger adsorption leads to easier planar membrane formation from vesicles, thus indicate that the shape transformation from vesicles to a planar membrane is dominated by the kinetic processes and the dynamics of the vesicles, rather than the adsorption state of individual vesicle. Area-selective SPB formation of adsorbed vesicles was induced by the irradiation of strong excitation light, which was assisted by the photo-induced expansion of SPB containing dye-labeled lipid molecules.

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“…1,2 In addition, well-defined 1D supramolecular aggregates such as thread-like micelles, fibers, and tubules have been prepared in many systems. Tubular structures have been found in many organic systems such as phospholipids, [3][4][5][6][7][8] glycolipids, [9][10][11][12] peptidic amphiphiles, [13][14][15] cholesterol derivatives, 16,17 model bile, 18 and bile salts, [19][20][21][22][23][24] etc.…”

Section: Introductionmentioning

confidence: 99%

A bile acid-induced aggregation transition and rheological properties in its mixtures with alkyltrimethylammonium hydroxide

et al. 2011

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A bile acid, lithocholic acid (LCA)-induced aggregation transition and rheological properties in the mixtures of LCA and alkyltrimethylammonium hydroxide were investigated. In the salt-free system of tetradecyltrimethylammonium hydroxide (TTAOH) and LCA at equimolar ratio, unilamellar vesicles were observed initially and then transferred to a suspension of tubes within several hours at 25 C, even at a very low total concentration. When an equimolar amount of NaBr was added into the solutions at a higher temperature, huge vesicles with a diameter of tens to hundreds of micrometres were formed initially and crystals quickly emerged inside the vesicles when cooling to room temperature spontaneously. In the longer chain system of cetyltrimethylammonium hydroxide (CTAOH)/LCA, vesicles were also observed after the dissolution of LCA in CTAOH micelle solution, but the vesicles were transferred to helical ribbons after several days at higher concentrations and a lower temperature, and gel was obtained after a longer time of aging. The huge vesicles were more stable than those of the TTAOH/LCA system when an equimolar amount of NaBr was added. The tube suspensions of the TTAOH/LCA system at a high concentration formed a weak gel with relatively low viscoelastic properties, indicating a weak interaction between the aggregates. The tube and helical ribbon suspensions can quickly transfer to viscoelastic vesicular solutions when heated at 30 C, indicating a reversible transition process.

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Novel Lipid Nanotubes in Dispersions of DMPC

Cited by 25 publications

References 16 publications

Supramolecular Structures Generated by a p‐tert‐Butylphenyl‐amide Derivative of Cholic Acid: From Vesicles to Molecular Tubes

Supramolecular Structures Generated by a p‐tert‐Butylphenyl‐amide Derivative of Cholic Acid: From Vesicles to Molecular Tubes

Shape Transformation of Adsorbed Vesicles on Oxide Surfaces: Effect of Substrate Material and Photo-Irradiation

A bile acid-induced aggregation transition and rheological properties in its mixtures with alkyltrimethylammonium hydroxide

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