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Sandoval-Altamirano C, Sanchez S, Pizarro N, Morales J, Gunther G. Alkyl-mannoside derivatives: Glycolipids able to form big size aggregates. J PHYS ORG CHEM 2019. [DOI: 10.1002/poc.3822] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- C. Sandoval-Altamirano
- Departamento de Química Orgánica y Fisicoquímica; Universidad de Chile, Facultad de Ciencias Químicas y Farmacéuticas; Santiago 1 Chile
| | - S.A. Sanchez
- Departamento de Polímeros; Universidad de Concepción, Facultad de Química; Concepción Chile
| | - N. Pizarro
- Departamento de Ciencias Químicas; Universidad Andrés Bello, Facultad de Ciencias Exactas; Viña del Mar Chile
| | - J. Morales
- Departamento de Ciencias y Tecnología Farmacéuticas; Universidad de Chile, Facultad de Ciencias Químicas y Farmacéuticas; Santiago Chile
| | - G. Gunther
- Departamento de Química Orgánica y Fisicoquímica; Universidad de Chile, Facultad de Ciencias Químicas y Farmacéuticas; Santiago 1 Chile
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Oka T, Hasan M, Islam MZ, Moniruzzaman M, Yamazaki M. Low-pH-Induced Lamellar to Bicontinuous Primitive Cubic Phase Transition in Dioleoylphosphatidylserine/Monoolein Membranes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:12487-12496. [PMID: 28967756 DOI: 10.1021/acs.langmuir.7b02512] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Electrostatic interactions (EIs) play important roles in the structure and stability of inverse bicontinuous cubic (QII) phases of lipid membranes. We examined the effect of pH on the phase of dioleoylphosphatidylserine (DOPS)/monoolein (MO) membranes at low ionic strengths using small-angle X-ray scattering (SAXS). We found that the phase transitions from lamellar liquid-crystalline (Lα) to primitive cubic (QIIP) phases in DOPS/MO (2/8 molar ratio) membranes occurred in buffers containing 50 mM NaCl at and below the final pH of 2.75 as the pH of the membrane suspension was decreased from a neutral value. The kinetic pathway of this transition was revealed using time-resolved SAXS with a stopped-flow apparatus. The first step is a rapid transition from the Lα phase to the hexagonal II (HII) phase, and the second step is a slow transition from the HII phase to the QIIP phase. We determined the rate constants of the first step, k1, and of the second step, k2, by analyzing the time course of SAXS intensities quantitatively. The k1 value increased with temperature. The analysis of this result provided the values of its apparent activation energy, which were constant over temperature but increased with pH. This can be explained by an EI effect on the free energy of the transition state. In contrast, the k2 value decreased with temperature, indicating that the true activation energy increased with temperature. These experimental results were analyzed using the theory of the activation energy of phase transitions of lipid membranes when the free energy of the transition state depends on temperature. On the basis of these results, we discussed the mechanism of this phase transition.
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Affiliation(s)
- Toshihiko Oka
- Nanomaterials Research Division, Research Institute of Electronics, ‡Department of Physics, Graduate School of Science, and §Integrated Bioscience Section, Graduate School of Science and Technology, Shizuoka University , Shizuoka 422-8529, Japan
| | - Moynul Hasan
- Nanomaterials Research Division, Research Institute of Electronics, ‡Department of Physics, Graduate School of Science, and §Integrated Bioscience Section, Graduate School of Science and Technology, Shizuoka University , Shizuoka 422-8529, Japan
| | - Md Zahidul Islam
- Nanomaterials Research Division, Research Institute of Electronics, ‡Department of Physics, Graduate School of Science, and §Integrated Bioscience Section, Graduate School of Science and Technology, Shizuoka University , Shizuoka 422-8529, Japan
| | - Md Moniruzzaman
- Nanomaterials Research Division, Research Institute of Electronics, ‡Department of Physics, Graduate School of Science, and §Integrated Bioscience Section, Graduate School of Science and Technology, Shizuoka University , Shizuoka 422-8529, Japan
| | - Masahito Yamazaki
- Nanomaterials Research Division, Research Institute of Electronics, ‡Department of Physics, Graduate School of Science, and §Integrated Bioscience Section, Graduate School of Science and Technology, Shizuoka University , Shizuoka 422-8529, Japan
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Lonhus K, Budianska L, Lisetski L. Meaning of activation energy in phospholipid multibilayers phase transitions. Chem Phys Lipids 2017; 206:53-59. [PMID: 28596068 DOI: 10.1016/j.chemphyslip.2017.04.011] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2017] [Revised: 04/21/2017] [Accepted: 04/26/2017] [Indexed: 01/20/2023]
Abstract
The question of the activation energy of phase transitions in lyotropic liquid crystal phases of model phospholipid membranes was considered. In our experiments, we obtained DSC thermograms of hydrated DPPC and DMPC at different scanning rates, and activation energy values were determined by a modification of Kissinger non-isothermal kinetics method. Using this approach the equivalent order of reaction corresponding to the phase transition can be determined alongside the activation energy. The cooperativity of both main transition and pre-transition was shown to be strongly dependent on scanning rate, asymptotically tending to a certain value at high rates, which corresponds to the number of lipid molecules in two concentric layers of hexagonal tiling. Changes in pretransition activation energy are shown to be proportional to changes in the system volume during the pretransition process, while the tail-length dependent part of the main transition activation energy is proportional to the jump in the number of gauche isomers.
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Affiliation(s)
- K Lonhus
- V. N. Karazin Kharkiv National University, Kharkiv, Ukraine; Institute for Scintillation Materials, STC "Institute for Single Crystals" of National Academy of Sciences of Ukraine, Kharkiv, Ukraine.
| | - L Budianska
- Institute for Scintillation Materials, STC "Institute for Single Crystals" of National Academy of Sciences of Ukraine, Kharkiv, Ukraine
| | - L Lisetski
- Institute for Scintillation Materials, STC "Institute for Single Crystals" of National Academy of Sciences of Ukraine, Kharkiv, Ukraine
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Oka T, Saiki T, Alam JM, Yamazaki M. Activation Energy of the Low-pH-Induced Lamellar to Bicontinuous Cubic Phase Transition in Dioleoylphosphatidylserine/Monoolein. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:1327-1337. [PMID: 26766583 DOI: 10.1021/acs.langmuir.5b03785] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Electrostatic interaction is an important factor for phase transitions between lamellar liquid-crystalline (Lα) and inverse bicontinuous cubic (QII) phases. We investigated the effect of temperature on the low-pH-induced Lα to double-diamond cubic (QII(D)) phase transition in dioleoylphosphatidylserine (DOPS)/monoolein (MO) using time-resolved small-angle X-ray scattering with a stopped-flow apparatus. Under all conditions of temperature and pH, the Lα phase was directly transformed into an intermediate inverse hexagonal (HII) phase, and subsequently the HII phase slowly converted to the QII(D) phase. We obtained the rate constants of the initial step (i.e., the Lα to HII phase transition) and of the second step (i.e., the HII to QII(D) phase transition) using the non-negative matrix factorization method. The rate constant of the initial step increased with temperature. By analyzing this result, we obtained the values of its apparent activation energy, Ea (Lα → HII), which did not change with temperature but increased with an increase in pH. In contrast, the rate constant of the second step decreased with temperature at pH 2.6, although it increased with temperature at pH 2.7 and 2.8. These results indicate that the value of Ea (HII → QII(D)) at pH 2.6 increased with temperature, but the values of Ea (HII → QII(D)) at pH 2.7 and 2.8 were constant with temperature. The values of Ea (HII → QII(D)) were smaller than those of Ea (Lα → HII) at the same pH. We analyzed these results using a modified quantitative theory on the activation energy of phase transitions of lipid membranes proposed initially by Squires et al. (Squires, A. M.; Conn, C. E.; Seddon, J. M.; Templer, R. H. Soft Matter 2009, 5, 4773). On the basis of these results, we discuss the mechanism of this phase transition.
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Affiliation(s)
- Toshihiko Oka
- Nanomaterials Research Division, Research Institute of Electronics, ‡Dept. Physics, Graduate School of Science, §Integrated Bioscience Section, Graduate School of Science and Technology, Shizuoka University , Shizuoka 422-8529, Japan
| | - Takahiro Saiki
- Nanomaterials Research Division, Research Institute of Electronics, ‡Dept. Physics, Graduate School of Science, §Integrated Bioscience Section, Graduate School of Science and Technology, Shizuoka University , Shizuoka 422-8529, Japan
| | - Jahangir Md Alam
- Nanomaterials Research Division, Research Institute of Electronics, ‡Dept. Physics, Graduate School of Science, §Integrated Bioscience Section, Graduate School of Science and Technology, Shizuoka University , Shizuoka 422-8529, Japan
| | - Masahito Yamazaki
- Nanomaterials Research Division, Research Institute of Electronics, ‡Dept. Physics, Graduate School of Science, §Integrated Bioscience Section, Graduate School of Science and Technology, Shizuoka University , Shizuoka 422-8529, Japan
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Howe J, Garidel P, Wulf M, Gerber S, Milkereit G, Vill V, Roessle M, Brandenburg K. Structural polymorphism of hydrated monoacylated maltose glycolipids. Chem Phys Lipids 2008; 155:31-7. [PMID: 18671955 DOI: 10.1016/j.chemphyslip.2008.07.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2008] [Revised: 06/30/2008] [Accepted: 07/01/2008] [Indexed: 11/29/2022]
Abstract
The physico-chemical properties of three fully hydrated monoacyl maltoside glycolipids were investigated with Fourier-transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC) and small-angle X-ray scattering (SAXS). The different synthesized maltoside glycoconjugates vary in the length and saturation of the fatty acid moiety, whereas the constant head group region contains a beta-linked maltose with a OC(2)-NH spacer. The compounds with saturated acyl chains showed a complex pattern of temperature-dependent behaviour, regarding the adopted three-dimensional aggregate structure of the molecules and the main phase transition from the gel to liquid crystalline phase of the acyl chains. A substitution of the saturated acyl chain with an unsaturated acyl chain led to a complete change of the structural preferences, from a high ordered stacking of the bilayers to an unilamellar arrangement of completely disordered and fluid membranes. The presence of the NH group in the spacer, compared to the compounds lacking the NH group allows the formation of a hydrogen bonding network, which influences the observed phase properties. The results of these studies of the hydrated monoacylated maltose glycolipids are discussed in relation to the thermotropic phase properties of the pure compounds in the absence of water.
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Affiliation(s)
- Jörg Howe
- Forschungszentrum Borstel, LG Biophysik, Parkallee 10, D-23845 Borstel, Germany
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Squires AM, Templer RH, Seddon JM, Woenkhaus J, Winter R, Narayanan T, Finet S. Kinetics and mechanism of the interconversion of inverse bicontinuous cubic mesophases. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2005; 72:011502. [PMID: 16089965 DOI: 10.1103/physreve.72.011502] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/02/2005] [Indexed: 05/03/2023]
Abstract
This paper describes time-resolved x-ray diffraction data monitoring the transformation of one inverse bicontinuous cubic mesophase into another, in a hydrated lipid system. The first section of the paper describes a mechanism for the transformation that conserves the topology of the bilayer, based on the work of Charvolin and Sadoc, Fogden and Hyde, and Benedicto and O'Brien in this area. We show a pictorial representation of this mechanism, in terms of both the water channels and the lipid bilayer. The second section describes the experimental results obtained. The system under investigation was 2:1 lauric acid: dilauroylphosphatidylcholine at a hydration of 50% water by weight. A pressure-jump was used to induce a phase transition from the gyroid (Q(G)(II)) to the diamond (Q(D)(II)) bicontinuous cubic mesophase, which was monitored by time-resolved x-ray diffraction. The lattice parameter of both mesophases was found to decrease slightly throughout the transformation, but at the stage where the Q (D)(II) phase first appeared, the ratio of lattice parameters of the two phases was found to be approximately constant for all pressure-jump experiments. The value is consistent with a topology-preserving mechanism. However, the polydomain nature of our sample prevents us from confirming that the specific pathway is that described in the first section of the paper. Our data also reveal signals from two different intermediate structures, one of which we have identified as the inverse hexagonal (H(II)) mesophase. We suggest that it plays a role in the transfer of water during the transformation. The rate of the phase transition was found to increase with both temperature and pressure-jump amplitude, and its time scale varied from the order of seconds to minutes, depending on the conditions employed.
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Thermotropic and lyotropic phase properties of glycolipid diastereomers: role of headgroup and interfacial interactions in determining phase behaviour. Curr Opin Colloid Interface Sci 2004. [DOI: 10.1016/j.cocis.2004.01.009] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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