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Teixeira CV, Blanzat M, Koetz J, Rico-Lattes I, Brezesinski G. In-plane miscibility and mixed bilayer microstructure in mixtures of catanionic glycolipids and zwitterionic phospholipids. Biochimica et Biophysica Acta (BBA) - Biomembranes 2006; 1758:1797-808. [PMID: 16859637 DOI: 10.1016/j.bbamem.2006.05.025] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2006] [Revised: 05/29/2006] [Accepted: 05/30/2006] [Indexed: 11/16/2022]
Abstract
SAXS/WAXS studies were performed in combination with freeze fracture electron microscopy using mixtures of a new Gemini catanionic surfactant (Gem16-12, formed by two sugar groups bound by a hydrocarbon spacer with 12 carbons and two 16-carbon chains) and the zwitterionic phospholipid 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC) to establish the phase diagram. Gem16-12 in water forms bilayers with the same amount of hydration water as DPPC. A frozen interdigitated phase with a low hydration number is observed below room temperature. The kinetics of the formation of this crystalline phase is very slow. Above the chain melting temperature, multilayered vesicles are formed. Mixing with DPPC produces mixed bilayers above the corresponding chain melting temperature. At room temperature, partially lamellar aggregates with local nematic order are observed. Splitting of infinite lamellae into discs is linked to immiscibility in frozen state. The ordering process is always accompanied by dehydration of the system. As a consequence, an unusual order-disorder phase transition upon cooling is observed.
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Affiliation(s)
- C V Teixeira
- Max Planck Institute of Colloids and Interfaces, Research Campus Golm, Am Mühlenberg 1, D-14476 Potsdam, Germany.
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Cantù L, Corti M, Del Favero E, Dubois M, Zemb TN. Combined Small-Angle X-ray and Neutron Scattering Experiments for Thickness Characterization of Ganglioside Bilayers. J Phys Chem B 1998. [DOI: 10.1021/jp972341d] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- L. Cantù
- Dipartimento di Chimica e Biochimica Medica - INFM, Università di Milano, LITA, via F.lli Cervi 93, 20090 Segrate, Italy, and Service de Chimie Moléculaire, CEA Saclay, Bat 125, 91191 Gif sur Yvette, France
| | - M. Corti
- Dipartimento di Chimica e Biochimica Medica - INFM, Università di Milano, LITA, via F.lli Cervi 93, 20090 Segrate, Italy, and Service de Chimie Moléculaire, CEA Saclay, Bat 125, 91191 Gif sur Yvette, France
| | - E. Del Favero
- Dipartimento di Chimica e Biochimica Medica - INFM, Università di Milano, LITA, via F.lli Cervi 93, 20090 Segrate, Italy, and Service de Chimie Moléculaire, CEA Saclay, Bat 125, 91191 Gif sur Yvette, France
| | - M. Dubois
- Dipartimento di Chimica e Biochimica Medica - INFM, Università di Milano, LITA, via F.lli Cervi 93, 20090 Segrate, Italy, and Service de Chimie Moléculaire, CEA Saclay, Bat 125, 91191 Gif sur Yvette, France
| | - Th. N. Zemb
- Dipartimento di Chimica e Biochimica Medica - INFM, Università di Milano, LITA, via F.lli Cervi 93, 20090 Segrate, Italy, and Service de Chimie Moléculaire, CEA Saclay, Bat 125, 91191 Gif sur Yvette, France
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