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Yao Y, Catalini S, Foggi P, Mezzenga R. Water-lipid interface in lipidic mesophases with excess water. Faraday Discuss 2024; 249:469-484. [PMID: 37786338 PMCID: PMC10845009 DOI: 10.1039/d3fd00118k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2023] [Accepted: 06/27/2023] [Indexed: 10/04/2023]
Abstract
This study investigates the influence of excess water on the lipidic mesophase during the phase transition from diamond cubic phase (Pn3̄m) to reverse hexagonal phase (HII). Using a combination of small angle X-ray scattering (SAXS), broadband dielectric spectroscopy (BDS), and Fourier transform infrared (FTIR) techniques, we explore the dynamics of lipids and their interaction with water during phase transition. Our BDS results reveal three relaxation processes originating from lipids, all of which exhibit a kink during the phase transition. With the excess water, these processes accelerate due to the plasticizing effect of water. Additionally, our results demonstrate that the headgroups in the HII phase are more densely packed than those in the Pn3̄m phase, which agrees with the FTIR results. Meanwhile, we investigate the influence of excess water on the lipid headgroups, the H-bond network of water, the lipid tail, and the interface carbonyl group between the head and tail of the lipid molecule. The results indicate that excess water permeates the lipid interface and forms additional hydrogen bonds with the carbonyl groups. As a result, the headgroups are more flexible in a lipidic mesophase with excess water than those in mesophases without excess water.
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Affiliation(s)
- Yang Yao
- Department of Health Sciences and Technology, ETH Zürich, 8092 Zürich, Switzerland.
| | - Sara Catalini
- European Laboratory for Non-Linear Spectroscopy, LENS, 50019 Florence, Italy
- Department of Physic and Geology, University of Perugia, 06123 Perugia, Italy
- CNR-INO, National Research Council-National Institute of Optics, 50125 Florence, Italy
| | - Paolo Foggi
- European Laboratory for Non-Linear Spectroscopy, LENS, 50019 Florence, Italy
- CNR-INO, National Research Council-National Institute of Optics, 50125 Florence, Italy
- Department of Chemistry, Biology and Biotechnology, University of Perugia, 06123 Perugia, Italy
| | - Raffaele Mezzenga
- Department of Health Sciences and Technology, ETH Zürich, 8092 Zürich, Switzerland.
- Department of Materials, ETH Zürich, 8093 Zürich, Switzerland
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2
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Zhao Y, Zhang X, Yang J, Gao M, Yang P, Wang Q, Li D, Feng J. A readily available and efficient Pt/
P25
(
TiO
2
) catalyst for glycerol selective oxidation. AIChE J 2022. [DOI: 10.1002/aic.17852] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Yang Zhao
- State Key Laboratory of Chemical Resource Engineering, Beijing Engineering Center for Hierarchical Catalysts Beijing University of Chemical Technology Beijing China
| | - Xinyi Zhang
- State Key Laboratory of Chemical Resource Engineering, Beijing Engineering Center for Hierarchical Catalysts Beijing University of Chemical Technology Beijing China
| | - Jiarui Yang
- State Key Laboratory of Chemical Resource Engineering, Beijing Engineering Center for Hierarchical Catalysts Beijing University of Chemical Technology Beijing China
| | - Mingyu Gao
- State Key Laboratory of Chemical Resource Engineering, Beijing Engineering Center for Hierarchical Catalysts Beijing University of Chemical Technology Beijing China
| | - Pengfei Yang
- State Key Laboratory of Chemical Resource Engineering, Beijing Engineering Center for Hierarchical Catalysts Beijing University of Chemical Technology Beijing China
| | - Qian Wang
- State Key Laboratory of Chemical Resource Engineering, Beijing Engineering Center for Hierarchical Catalysts Beijing University of Chemical Technology Beijing China
| | - Dianqing Li
- State Key Laboratory of Chemical Resource Engineering, Beijing Engineering Center for Hierarchical Catalysts Beijing University of Chemical Technology Beijing China
- Beijing Engineering Center for Hierarchical Catalysts Beijing University of Chemical Technology Beijing China
| | - Junting Feng
- State Key Laboratory of Chemical Resource Engineering, Beijing Engineering Center for Hierarchical Catalysts Beijing University of Chemical Technology Beijing China
- Beijing Engineering Center for Hierarchical Catalysts Beijing University of Chemical Technology Beijing China
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3
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Kozaka S, Wakabayashi R, Kamiya N, Goto M. Lyotropic liquid crystal-based transcutaneous peptide delivery system: Evaluation of skin permeability and potential for transcutaneous vaccination. Acta Biomater 2022; 138:273-284. [PMID: 34774785 DOI: 10.1016/j.actbio.2021.11.008] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2021] [Revised: 10/13/2021] [Accepted: 11/05/2021] [Indexed: 12/27/2022]
Abstract
Transcutaneous drug delivery is a promising method in terms of drug repositioning and reformulation because of its non-invasive and easy-to-use features. To overcome the skin barrier, which is the biggest challenge in transcutaneous drug delivery, a number of techniques, such as microemulsion, solid-in-oil dispersions and liposomes, have been studied extensively. However, the low viscosity of these formulations limits drug retention on the skin and reduces patient acceptability. Although viscosity can be increased by adding a thickening reagent, such an addition often alters formulation nanostructures and drug solubility, and importantly, decreases skin permeability. In this study, a gel-like lyotropic liquid crystal (LLC) was used as a tool to enhance skin permeability. In particular, we prepared 1-monolinolein (ML)-based LLCs with different water contents. All LLCs significantly enhanced skin permeation of a peptide drug, an epitope peptide of melanoma, despite their high viscoelasticity. Fourier transform infra-red spectroscopic analysis of the skin surface treated with the LLCs revealed that the gyroid geometry more strongly interacted with the lamellar structure inside the stratum corneum (SC) than the diamond geometry. Finally, as the result of the in vivo tumor challenge experiment using B16F10 melanoma-bearing mice, the LLC with the gyroid geometry showed stronger vaccine effect against tumor than a subcutaneous injection. Collectively, ML-based LLCs, especially with the gyroid geometry, are a promising strategy to deliver biomacromolecules into skin. STATEMENT OF SIGNIFICANCE: Transcutaneous drug delivery is a promising method for drug repositioning and reformulation because of its non-invasive and easy-to-use features. To overcome the skin barrier, which is the biggest challenge in transcutaneous drug delivery, we used a gel-like lyotropic liquid crystal (LLC) as a novel tool to enhance skin permeability. In this paper, we demonstrated that an LLC with a specific liquid crystalline structure has the highest skin permeation enhancement effect for a peptide antigen as a model drug. Moreover, the peptide antigen-loaded LLC showed a vaccine effect that was comparable to a subcutaneous injection in vivo. This study provides a basis for designing a transcutaneous delivery system of peptide drugs with LLC.
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4
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Yao Y, Catalini S, Kutus B, Hunger J, Foggi P, Mezzenga R. Probing Water State during Lipidic Mesophases Phase Transitions. Angew Chem Int Ed Engl 2021; 60:25274-25280. [PMID: 34558162 PMCID: PMC9298331 DOI: 10.1002/anie.202110975] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2021] [Revised: 09/16/2021] [Indexed: 11/30/2022]
Abstract
We investigate the static and dynamic states of water network during the phase transitions from double gyroid ( I a 3 ‾ d ) to double diamond ( P n 3 ‾ m ) bicontinuous cubic phases and from the latter to the reverse hexagonal (HII ) phase in monolinolein based lipidic mesophases by combining FTIR and broadband dielectric spectroscopy (BDS). In both cubic(s) and HII phase, two dynamically different fractions of water are detected and attributed to bound and interstitial free water. The dynamics of the two water fractions are all slower than bulk water due to the hydrogen-bonds between water molecules and the lipid's polar headgroups and to nanoconfinement. Both FTIR and BDS results suggest that a larger fraction of water is hydrogen-bonded to the headgroup of lipids in the HII phase at higher temperature than in the cubic phase at lower temperature via H-bonds, which is different from the common expectation that the number of H-bonds should decrease with increase of temperature. These findings are rationalized by considering the topological ratio of interface/volume of the two mesophases.
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Affiliation(s)
- Yang Yao
- Department of Health Sciences and TechnologyETH ZürichSchmelzbergstrasse 98092ZürichSwitzerland
| | - Sara Catalini
- European Laboratory for Non-Linear Spectroscopy, LENSVia Nello Carrara 150019FlorenceItaly
| | - Bence Kutus
- Max Planck Institute for Polymer ResearchAckermannweg 1055128MainzGermany
| | - Johannes Hunger
- Max Planck Institute for Polymer ResearchAckermannweg 1055128MainzGermany
| | - Paolo Foggi
- European Laboratory for Non-Linear Spectroscopy, LENSVia Nello Carrara 150019FlorenceItaly
- Department of ChemistryUniversity of PerugiaVia Elce di Sotto 806123PerugiaItaly
| | - Raffaele Mezzenga
- Department of Health Sciences and TechnologyETH ZürichSchmelzbergstrasse 98092ZürichSwitzerland
- Department of MaterialsETH ZürichWolfgang-Pauli-Strasse 108093ZürichSwitzerland
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5
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Yao Y, Catalini S, Kutus B, Hunger J, Foggi P, Mezzenga R. Probing Water State during Lipidic Mesophases Phase Transitions. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202110975] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Yang Yao
- Department of Health Sciences and Technology ETH Zürich Schmelzbergstrasse 9 8092 Zürich Switzerland
| | - Sara Catalini
- European Laboratory for Non-Linear Spectroscopy, LENS Via Nello Carrara 1 50019 Florence Italy
| | - Bence Kutus
- Max Planck Institute for Polymer Research Ackermannweg 10 55128 Mainz Germany
| | - Johannes Hunger
- Max Planck Institute for Polymer Research Ackermannweg 10 55128 Mainz Germany
| | - Paolo Foggi
- European Laboratory for Non-Linear Spectroscopy, LENS Via Nello Carrara 1 50019 Florence Italy
- Department of Chemistry University of Perugia Via Elce di Sotto 8 06123 Perugia Italy
| | - Raffaele Mezzenga
- Department of Health Sciences and Technology ETH Zürich Schmelzbergstrasse 9 8092 Zürich Switzerland
- Department of Materials ETH Zürich Wolfgang-Pauli-Strasse 10 8093 Zürich Switzerland
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6
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Sonkaria S, Ahn SH, Lee CS, Khare V. "On the Dot"-The Timing of Self-Assembled Growth to the Quantum Scale. Chemistry 2017; 23:8104-8117. [PMID: 28032925 DOI: 10.1002/chem.201604994] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2016] [Indexed: 11/10/2022]
Abstract
Understanding the complex world of material growth and tunability has mystified the minds of material scientists and has been met with increasing efforts to close the gap between controllability and applicability. The reality of this journey is frustratingly tortuous but is being eased through better conceptual appreciation of metal crystalline frameworks that originate from shape and size dependent solvent responsive growth patterns. The quantum confinement of TiO2 in the range of 0.8-2 nm has been synthetically challenging to achieve but lessons from biomineralization processes have enabled alternative routes to be explored via self-induced pre-nucleation events. In driving this concept, we have incorporated many of these key features integrating aspects of low temperature annealing at the interface of complex heterogeneous nucleation between hard and soft materials to arrest the biomimetic amorphous phase of TiO2 to a tunable crystalline quantumized state. The stabilization of metastable states of quantum sized TiO2 driven by kinetic and thermodynamic processes show hallmarks of biomineralized controlled events that suggest the inter-play between new pathways and interfacial energies that preferentially favor low dimensionality at the quantum scale. This provides the potential to re-direct synthetic assemblies under tightly controlled parameters to generate a host of new materials with size, shape and anisotropic properties as smart stimuli responsive materials. These new stabilities leading to the growth arrest of TiO2 are discussed in terms of molecular interactions and structural frameworks that were previously inaccessible via conventional routes. There exists an undiscovered parallel between synthetic and biomineralized routes enabling unprecedented access to the availability and tunability of novel quantum confined materials. The parametrics of complex material design at the crossroads of synthetically and biologically driven processes is only now surfacing.
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Affiliation(s)
- Sanjiv Sonkaria
- Institute of Advanced Machinery and Design, Seoul National University, Gwanak Ro1, Seoul, Republic of Korea
| | - Sung-Hoon Ahn
- Institute of Advanced Machinery and Design, Seoul National University, Gwanak Ro1, Seoul, Republic of Korea.,Department of Mechanical and Aerospace Engineering, Seoul National University, Gwanak Ro1, Seoul, Republic of Korea
| | - Caroline S Lee
- Department of Materials Engineering, Hanyang University, Gyeongi, Ansan, 426-791, Republic of Korea
| | - Varsha Khare
- Institute of Advanced Machinery and Design, Seoul National University, Gwanak Ro1, Seoul, Republic of Korea
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7
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Submicron complex lipid carriers for curcumin delivery to intestinal epithelial cells: Effect of different emulsifiers on bioaccessibility and cell uptake. Int J Pharm 2015; 494:357-69. [DOI: 10.1016/j.ijpharm.2015.08.039] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2015] [Revised: 08/12/2015] [Accepted: 08/13/2015] [Indexed: 01/26/2023]
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8
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Cohen-Avrahami M, Shames AI, Ottaviani MF, Aserin A, Garti N. On the correlation between the structure of lyotropic carriers and the delivery profiles of two common NSAIDs. Colloids Surf B Biointerfaces 2014; 122:231-240. [DOI: 10.1016/j.colsurfb.2014.04.026] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2013] [Revised: 04/25/2014] [Accepted: 04/29/2014] [Indexed: 01/20/2023]
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9
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Structural characterization of lyotropic liquid crystals containing a dendrimer for solubilization and release of gallic acid. Colloids Surf B Biointerfaces 2013; 112:87-95. [PMID: 23973908 DOI: 10.1016/j.colsurfb.2013.06.051] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2013] [Revised: 06/18/2013] [Accepted: 06/21/2013] [Indexed: 12/31/2022]
Abstract
The role of 2nd generation polypropyleneimine (PPIG2) dendrimer in controlling the release of gallic acid (GA) as a model drug from lyotropic liquid crystal was explored. GA (0.2wt%) was solubilized in three types of mesophases: lamellar (Lα), cubic (space group of Ia3d, Q(G)), and reverse hexagonal (HII), composed of GMO and water (and d-α-tocopherol, or tricaprylin in the case of HII mesophases). Small angle X-ray scattering (SAXS) and attenuated total reflectance Fourier transform infrared (ATR-FTIR) along with UV spectrophotometry were utilized to elucidate the structure modifications and release resulting from the cosolubilization of GA and PPIG2. Solubilization of PPIG2 into Lα and Q(G) phases caused transformation of both structures to HII. The diffusion of GA out of the mesophases was found to be dependent on water content and PPIG2 concentration. Rapid release from Lα+PPIG2 and Q(G)+PPIG2 mesophases was recorded. The release from both HII mixtures (with d-α-tocopherol and tricaprylin) was shown to be dependent on the type of oil. Release studies conducted for 72h showed that GA release can be modulated and sustained by the presence of PPIG2, supposedly due to the electrostatic interactions between the dendrimer and the drug molecule.
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10
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Mishra RK, Ramasamy K, Majeed ABA. pH-responsive poly(DMAPMA-co-HEMA)-based hydrogels for prolonged release of 5-fluorouracil. J Appl Polym Sci 2012. [DOI: 10.1002/app.36714] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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11
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Bitan-Cherbakovsky L, Libster D, Aserin A, Garti N. Complex dendrimer-lyotropic liquid crystalline systems: structural behavior and interactions. J Phys Chem B 2011; 115:11984-92. [PMID: 21902258 DOI: 10.1021/jp2030939] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The incorporation of dendrimer into three lyotropic liquid crystalline (LLCs) mesophases is demonstrated for the first time. A second generation (G2) of poly(propylene imine) dendrimer (PPI) was solubilized into lamellar, diamond reverse cubic, and reverse hexagonal LLCs composed of glycerol monooleate (GMO), and water (and D-α-tocopherol in the H(II) system). The combination of PPI with LLCs may provide an advantageous drug delivery system. Cross-polarized light microscope, small-angle X-ray scattering (SAXS), and attenuated total reflectance Fourier transform infrared (ATR-FTIR) were utilized to study the structural behavior of the mesophases, the localization of PPI within the system, and the interactions between the guest molecule and the system's components. It was revealed that PPI-G2 functioned as a "water pump", competing with the lipid headgroups for water binding. As a result, L(α)→H(II) and Q(224)→H(II) structural shifts were detected (at 10 wt % PPI-G2 content), probably caused by the dehydration of monoolein headgroups and subsequent increase of the lipid's critical packing parameter (CPP). In the case of H(II), as a result of the balance between the dehydration of the monoolein headgroups and the significant presence of PPI within the interfacial region, increasing the quantity of hydrogen bonds, no structural transitions occurred. ATR-FTIR analysis demonstrated a downward shift of the H-O-H (water), as a result of PPI-G2 embedment, suggesting an increase in the mean water-water H-bond angle resulting from binding PPI-G2 to the water network. Additionally, the GMO hydroxyl groups at β- and γ-C-OH positions revealed a partial interaction of hydrogen bonds with N-H functional groups of the protonated PPI-G2. Other GMO interfacial functional groups were shown to interact with the PPI-G2, in parallel with the GMO dehydration phenomenon. In the future, these outcomes can be used to design advanced drug delivery systems, allowing administration of dendrimers as a therapeutic agent from LLCs.
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Affiliation(s)
- Liron Bitan-Cherbakovsky
- Casali Institute of Applied Chemistry, The Hebrew University of Jerusalem, Edmond J. Safra Campus, Givat Ram, Jerusalem 91904, Israel
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12
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Ragoonanan V, Wiedmann T, Aksan A. Characterization of the Effect of NaCl and Trehalose on the Thermotropic Hysteresis of DOPC Lipids during Freeze/Thaw. J Phys Chem B 2010; 114:16752-8. [PMID: 21090771 DOI: 10.1021/jp103960r] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Vishard Ragoonanan
- Biostabilization Laboratory, Mechanical Engineering Department, College of Science and Engineering, University of Minnesota, Minneapolis, Minnesota 55455, United States, and Department of Pharmaceutics, College of Pharmacy, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Timothy Wiedmann
- Biostabilization Laboratory, Mechanical Engineering Department, College of Science and Engineering, University of Minnesota, Minneapolis, Minnesota 55455, United States, and Department of Pharmaceutics, College of Pharmacy, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Alptekin Aksan
- Biostabilization Laboratory, Mechanical Engineering Department, College of Science and Engineering, University of Minnesota, Minneapolis, Minnesota 55455, United States, and Department of Pharmaceutics, College of Pharmacy, University of Minnesota, Minneapolis, Minnesota 55455, United States
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13
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Murgia S, Lampis S, Zucca P, Sanjust E, Monduzzi M. Nucleotide recognition and phosphate linkage hydrolysis at a lipid cubic interface. J Am Chem Soc 2010; 132:16176-84. [PMID: 20977215 DOI: 10.1021/ja1069745] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Mononucleotides, when entrapped within a mono-olein-based cubic Ia3d liquid crystalline phase, have been found to undergo hydrolysis at the sugar-phosphate ester bond in spite of their natural inertness toward hydrolysis. Here, kinetics of the hydrolysis reaction and interactions between the lipid matrix and the mononucleotide adenosine 5'-monophosphate disodium salt (AMP) and its 2'-deoxy derivative (dAMP) are thoroughly investigated in order to shed some light on the mechanism of the nucleotide recognition and phosphate ester hydrolysis. Experiments evidenced that molecular recognition occurs essentially through the sn-2 and the sn-3 alcoholic OH groups of mono-olein. As deduced from the apparent activation energies, the mechanism underlying the hydrolysis reaction is the same for AMP and dAMP. Nevertheless, the reaction proceeds slower for the latter, highlighting a substantial difference in the chemical behavior of the two nucleotides. A model that explains the hydrolysis reaction is presented. Remarkably, the hydrolysis mechanism appears to be highly specific for the Ia3d phase.
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Affiliation(s)
- Sergio Murgia
- Department of Chemical Science, Cagliari University, CNBS and CSGI, ss 554, bivio Sestu, 09042 Monserrato (CA), Italy.
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14
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Efrat R, Abramov Z, Aserin A, Garti N. Nonionic−Anionic Mixed Surfactants Cubic Mesophases. Part I: Structural Chaotropic and Kosmotropic Effect. J Phys Chem B 2010; 114:10709-16. [DOI: 10.1021/jp103799a] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Rivka Efrat
- Casali Institute of Applied Chemistry, The Institute of Chemistry, The Hebrew University of Jerusalem, Edmond J. Safra Campus, Jerusalem 91904, Israel
| | - Zoya Abramov
- Casali Institute of Applied Chemistry, The Institute of Chemistry, The Hebrew University of Jerusalem, Edmond J. Safra Campus, Jerusalem 91904, Israel
| | - Abraham Aserin
- Casali Institute of Applied Chemistry, The Institute of Chemistry, The Hebrew University of Jerusalem, Edmond J. Safra Campus, Jerusalem 91904, Israel
| | - Nissim Garti
- Casali Institute of Applied Chemistry, The Institute of Chemistry, The Hebrew University of Jerusalem, Edmond J. Safra Campus, Jerusalem 91904, Israel
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15
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Bitan-Cherbakovsky L, Yuli-Amar I, Aserin A, Garti N. Solubilization of vitamin E into H(II) LLC mesophase in the presence and in the absence of vitamin C. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:3648-3653. [PMID: 20175578 DOI: 10.1021/la903100m] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The synergistic solubilization of two major hydrophilic (vitamin C, ascorbic acid, AA) and lipophilic (vitamin E, D-alpha-tocopherol, VE) antioxidants within reverse hexagonal (H(II)) mesophases is reported. The H(II) mesophases are composed of monoolein (GMO)/VE/AA/water. A wide range of VE concentration was examined (on the expense of GMO concentrations) while the AA and water concentrations remained constant (4 and 12.5 wt %, respectively) in order to expand the H(II) mesophase. SAXS and DSC combined with ATR-FTIR techniques were utilized to study the interactions between each solubilizate and the H(II) component that enabled the synergistic accommodation of the hydrophilic and hydrophobic molecules. It was revealed that up to 27 wt % VE solubilized within the H(II) mesophase. This hydrophobic additive localized at the lipophilic GMO tail region solvating the surfactant tails, thereby enabling the formation of the H(II) structure. As a result, the lattice parameter and the melting point of the hydrophobic tails decreased. Above 27 wt % VE (up to 33 wt %), once the GMO lipophilic region was homogenously solvated, additional VE molecules located closer to the interface. At this range of concentrations, new hydrogen bonds between O-H groups of VE and O-H groups of GMO were formed. Once 35 wt % VE was introduced, the H(II) structure transformed to face-centered reverse micellar cubic phase (Fd3m, Q(227)).
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Affiliation(s)
- Liron Bitan-Cherbakovsky
- Casali Institute of Applied Chemistry, The Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
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16
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Bitan-Cherbakovsky L, Yuli-Amar I, Aserin A, Garti N. Structural rearrangements and interaction within H(II) mesophase induced by cosolubilization of vitamin E and ascorbic acid. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:13106-13113. [PMID: 19852480 DOI: 10.1021/la901195t] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
We investigated the effect of ascorbic acid (AA) cosolubilized with vitamin E (VE) on reverse hexagonal (H(II)) mesophase. The H(II) phase comprises monoolein (GMO)/d-alpha-tocopherol (VE) in a ratio of 90/10 by weight and 12.5 wt % water. The macrostructural characteristics of this system were determined by polarized light microscopy and small-angle X-ray scattering measurements. We used differential scanning calorimetry and attenuated total reflectance Fourier transform infrared to characterize the microstructure, the vibration of the functional groups, and the location of the AA guest molecule. AA was incorporated to the system in two steps: 1-4 wt % AA and 5-6 wt % AA. We compared this system to one containing tricaprylin as the oil phase, as previously reported. These measurements revealed that AA is localized first in the water rich-core and in the interface, and acts as a chaotropic molecule that decreases the water melting point. When a larger quantity of AA (5-6 wt %) is added, the system is saturated, and the AA is located in the inner cylinder and manifested by more moderate distortion. The addition of AA also causes alteration in the behavior of the GMO hydrocarbon chains and makes them more flexible. Further addition of AA caused the GMO hydrocarbon chain to be more solvated by the VE hydrocarbon chain and enabled additional migration of VE; hence a decrease in the hydrophobic melting temperature occurred (similar to tricaprylin). Increasing the amount of AA weakened the bonding between the GMO and water and created new bonds between AA and GMO and AA with water.
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Affiliation(s)
- Liron Bitan-Cherbakovsky
- Casali Institute of Applied Chemistry, The Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
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17
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Boyd BJ, Dong YD, Rades T. Nonlamellar liquid crystalline nanostructured particles: advances in materials and structure determination. J Liposome Res 2009; 19:12-28. [DOI: 10.1080/08982100802691983] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
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18
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Molecular interactions in reverse hexagonal mesophase in the presence of Cyclosporin A. Int J Pharm 2009; 367:115-26. [DOI: 10.1016/j.ijpharm.2008.09.048] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2008] [Revised: 09/18/2008] [Accepted: 09/22/2008] [Indexed: 11/19/2022]
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19
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Amar-Yuli I, Aserin A, Garti N. Solubilization of Nutraceuticals into Reverse Hexagonal Mesophases. J Phys Chem B 2008; 112:10171-80. [DOI: 10.1021/jp802737k] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Idit Amar-Yuli
- Casali Institute of Applied Chemistry, The Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
| | - Abraham Aserin
- Casali Institute of Applied Chemistry, The Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
| | - Nissim Garti
- Casali Institute of Applied Chemistry, The Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
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Yaghmur A, Laggner P, Sartori B, Rappolt M. Calcium triggered L alpha-H2 phase transition monitored by combined rapid mixing and time-resolved synchrotron SAXS. PLoS One 2008; 3:e2072. [PMID: 18446202 PMCID: PMC2320977 DOI: 10.1371/journal.pone.0002072] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2008] [Accepted: 03/20/2008] [Indexed: 12/04/2022] Open
Abstract
Background Awad et al. [1] reported on the Ca2+-induced transitions of dioleoyl-phosphatidylglycerol (DOPG)/monoolein (MO) vesicles to bicontinuous cubic phases at equilibrium conditions. In the present study, the combination of rapid mixing and time-resolved synchrotron small-angle X-ray scattering (SAXS) was applied for the in-situ investigations of fast structural transitions of diluted DOPG/MO vesicles into well-ordered nanostructures by the addition of low concentrated Ca2+ solutions. Methodology/Principal Findings Under static conditions and the in absence of the divalent cations, the DOPG/MO system forms large vesicles composed of weakly correlated bilayers with a d-spacing of ∼140 Å (Lα-phase). The utilization of a stopped-flow apparatus allowed mixing these DOPG/MO vesicles with a solution of Ca2+ ions within 10 milliseconds (ms). In such a way the dynamics of negatively charged PG to divalent cation interactions, and the kinetics of the induced structural transitions were studied. Ca2+ ions have a very strong impact on the lipidic nanostructures. Intriguingly, already at low salt concentrations (DOPG/Ca2+>2), Ca2+ ions trigger the transformation from bilayers to monolayer nanotubes (inverted hexagonal phase, H2). Our results reveal that a binding ratio of 1 Ca2+ per 8 DOPG is sufficient for the formation of the H2 phase. At 50°C a direct transition from the vesicles to the H2 phase was observed, whereas at ambient temperature (20°C) a short lived intermediate phase (possibly the cubic Pn3m phase) coexisting with the H2 phase was detected. Conclusions/Significance The strong binding of the divalent cations to the negatively charged DOPG molecules enhances the negative spontaneous curvature of the monolayers and causes a rapid collapsing of the vesicles. The rapid loss of the bilayer stability and the reorganization of the lipid molecules within ms support the argument that the transition mechanism is based on a leaky fusion of the vesicles.
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Affiliation(s)
- Anan Yaghmur
- Institute of Biophysics and Nanosystems Research, Austrian Academy of Sciences, Graz, Austria.
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Amar-Yuli I, Wachtel E, Shalev DE, Aserin A, Garti N. Low Viscosity Reversed Hexagonal Mesophases Induced by Hydrophilic Additives. J Phys Chem B 2008; 112:3971-82. [DOI: 10.1021/jp711421k] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Idit Amar-Yuli
- Casali Institute of Applied Chemistry, The Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel, Faculty of Chemistry, The Weizmann Institute of Science, Rehovot 76100, Israel, and Wolfson Centre for Applied Structural Biology, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
| | - Ellen Wachtel
- Casali Institute of Applied Chemistry, The Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel, Faculty of Chemistry, The Weizmann Institute of Science, Rehovot 76100, Israel, and Wolfson Centre for Applied Structural Biology, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
| | - Deborah E. Shalev
- Casali Institute of Applied Chemistry, The Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel, Faculty of Chemistry, The Weizmann Institute of Science, Rehovot 76100, Israel, and Wolfson Centre for Applied Structural Biology, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
| | - Abraham Aserin
- Casali Institute of Applied Chemistry, The Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel, Faculty of Chemistry, The Weizmann Institute of Science, Rehovot 76100, Israel, and Wolfson Centre for Applied Structural Biology, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
| | - Nissim Garti
- Casali Institute of Applied Chemistry, The Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel, Faculty of Chemistry, The Weizmann Institute of Science, Rehovot 76100, Israel, and Wolfson Centre for Applied Structural Biology, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
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22
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Amar-Yuli I, Wachtel E, Shalev DE, Moshe H, Aserin A, Garti N. Thermally Induced Fluid Reversed Hexagonal (HII) Mesophase. J Phys Chem B 2007; 111:13544-53. [DOI: 10.1021/jp076662t] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Idit Amar-Yuli
- Casali Institute of Applied Chemistry, The Institute of Chemistry, and Wolfson Centre for Applied Structural Biology, The Hebrew University of Jerusalem, Jerusalem 91904, Israel, and Faculty of Chemistry, The Weizmann Institute of Science, Rehovot 76100, Israel
| | - Ellen Wachtel
- Casali Institute of Applied Chemistry, The Institute of Chemistry, and Wolfson Centre for Applied Structural Biology, The Hebrew University of Jerusalem, Jerusalem 91904, Israel, and Faculty of Chemistry, The Weizmann Institute of Science, Rehovot 76100, Israel
| | - Deborah E. Shalev
- Casali Institute of Applied Chemistry, The Institute of Chemistry, and Wolfson Centre for Applied Structural Biology, The Hebrew University of Jerusalem, Jerusalem 91904, Israel, and Faculty of Chemistry, The Weizmann Institute of Science, Rehovot 76100, Israel
| | - Hagai Moshe
- Casali Institute of Applied Chemistry, The Institute of Chemistry, and Wolfson Centre for Applied Structural Biology, The Hebrew University of Jerusalem, Jerusalem 91904, Israel, and Faculty of Chemistry, The Weizmann Institute of Science, Rehovot 76100, Israel
| | - Abraham Aserin
- Casali Institute of Applied Chemistry, The Institute of Chemistry, and Wolfson Centre for Applied Structural Biology, The Hebrew University of Jerusalem, Jerusalem 91904, Israel, and Faculty of Chemistry, The Weizmann Institute of Science, Rehovot 76100, Israel
| | - Nissim Garti
- Casali Institute of Applied Chemistry, The Institute of Chemistry, and Wolfson Centre for Applied Structural Biology, The Hebrew University of Jerusalem, Jerusalem 91904, Israel, and Faculty of Chemistry, The Weizmann Institute of Science, Rehovot 76100, Israel
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Yaghmur A, Laggner P, Zhang S, Rappolt M. Tuning curvature and stability of monoolein bilayers by designer lipid-like peptide surfactants. PLoS One 2007; 2:e479. [PMID: 17534429 PMCID: PMC1868779 DOI: 10.1371/journal.pone.0000479] [Citation(s) in RCA: 93] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2007] [Accepted: 05/03/2007] [Indexed: 11/19/2022] Open
Abstract
This study reports the effect of loading four different charged designer lipid-like short anionic and cationic peptide surfactants on the fully hydrated monoolein (MO)-based Pn3m phase (Q(224)). The studied peptide surfactants comprise seven amino acid residues, namely A(6)D, DA(6), A(6)K, and KA(6). D (aspartic acid) bears two negative charges, K (lysine) bears one positive charge, and A (alanine) constitutes the hydrophobic tail. To elucidate the impact of these peptide surfactants, the ternary MO/peptide/water system has been investigated using small-angle X-ray scattering (SAXS), within a certain range of peptide concentrations (R
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Affiliation(s)
- Anan Yaghmur
- Institute of Biophysics and Nanosystems Research (IBN), Austrian Academy of Sciences, Graz, Austria.
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24
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Milani S, Bombelli FB, Berti D, Hauss T, Dante S, Baglioni P. Structural investigation of bilayers formed by 1-palmitoyl-2-oleoylphosphatidylnucleosides. Biophys J 2006; 90:1260-9. [PMID: 16326904 PMCID: PMC1367277 DOI: 10.1529/biophysj.105.067645] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2005] [Accepted: 10/31/2005] [Indexed: 11/18/2022] Open
Abstract
Bilayers of palmitoyl-oleoylphosphatidylnucleoside derivatives (1-palmitoyl-2-oleoyl-phosphatidyl-adenosine and 1-palmitoyl-2-oleoyl-phosphatidyl-uridine) were synthesized and investigated in the low-water content regime by a combination of neutron diffraction and Fourier transform infrared linear dichroism (LD-FTIR). Attention was focused on the modulation of structural properties operated by the presence of nucleic acid bases (either adenosine or uridine, a purine and a pyrimidine that are complementary in RNA). Base substitution causes major differences in phase behavior of the phospholipids, i.e., water sorption from a controlled humidity atmosphere and smectic periodicity. The profile of scattering length density can be inferred from five diffraction orders for 1-palmitoyl-2-oleoyl-phosphatidyl-uridine lamellar phase. 1-Palmitoyl-2-oleoyl-phosphatidyl-adenosine is characterized by lower and less ready hydration, giving rise to a powder-like sample. A linear dichroism FTIR investigation on the same lamellar phases was undertaken with the purpose of gathering details at the submolecular level on different portions of the molecule. 1-Palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine bilayers were also investigated with the same technique for the sake of comparison. Besides a confirmation of the diffraction data interpretation, FTIR has provided evidence that the same chemical groups at the bilayer interface (namely the sugar-phosphate) have a different orientation depending on whether the base is a purine or a pyrimidine. A very simple geometrical optimization agrees with this observation. This indicates that a different pattern of base interaction is operating in the two cases and that base substitution acts as a modulator of the phase properties.
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Affiliation(s)
- Silvia Milani
- Department of Chemistry and CSGI (Consorzio Interuniversitario per lo sviluppo dei Sistemi a Grande Interfase), University of Florence, Florence, Italy
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Misiūnas A, Niaura G, Talaikyte Z, Eicher-Lorka O, Razumas V. Infrared and Raman bands of phytantriol as markers of hydrogen bonding and interchain interaction. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2005; 62:945-57. [PMID: 15961342 DOI: 10.1016/j.saa.2005.03.024] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2005] [Revised: 03/14/2005] [Accepted: 03/20/2005] [Indexed: 05/03/2023]
Abstract
Hydrogen bonding and interchain interactions in phytantriol, 3,7,11,15-tetramethyl-1,2,3-hexadecanetriol, have been studied by Fourier transform infrared (FT-IR) and Raman spectroscopies. Assignments of the bands were performed based on the OH/OD isotopic substitution, molecular modeling, and measurements of polarized Raman spectra. Marker bands were evaluated from the temperature-dependent spectral changes. It is shown that Raman spectroscopy provides sensitive markers, namely I(delta(CH2))/I(deltas(CH3)), tau(CH)2, I(nus(CH3)(FR))/I(nus(CH2)), and nus(CH2) for probing the interactions between the hydrocarbon chains. Hydrogen bonding interaction might be studied through the difference Raman spectroscopy by the analysis of polarized band at 811 cm-1. Relationship is found between the frequencies of IR bands at 883-873 and 1097-1086 cm-1, associated with the vibrations localized at the primary COH site, and the frequencies of OH stretching mode, making these bands specific markers in the analysis of hydrogen bonding. Evaluated marker bands may be of utility to probe the interchain and hydrogen bonding interaction of phytantriol with guest molecules in the practically important aqueous liquid-crystalline phases of this lipid.
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Affiliation(s)
- Audrius Misiūnas
- Institute of Biochemistry, Mokslininku 12, LT-08662 Vilnius, Lithuania
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26
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Ouimet J, Lafleur M. Hydrophobic match between cholesterol and saturated fatty acid is required for the formation of lamellar liquid ordered phases. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2004; 20:7474-7481. [PMID: 15323491 DOI: 10.1021/la0491293] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Palmitic acid and cholesterol have been shown to form, under certain conditions, bilayers in the liquid ordered (lo) phase. In the present work, the contribution of the hydrophobic match between cholesterol (chol), and the acyl chain of saturated fatty acids (FA) has been examined. The behavior of FA/chol mixtures where the FA acyl chain length was varied between 12 and 24 carbon atoms was investigated by infrared and 2H NMR spectroscopy, as well as by differential scanning calorimetry. It was found that only fatty acids with acyl chains of 14-18 carbon atoms lead to the formation of lo phase bilayers. The length of these chains corresponds, in fact, to the length of the long axis of the cholesterol molecule. Therefore, the hydrophobic match between the apolar parts of the molecular constituents appears to be a requisite for the formation of lamellar lo phases.
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Affiliation(s)
- Jaclin Ouimet
- Department of Chemistry, Université de Montréal, Montréal, Québec, Canada, H3C 3J7
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Feiweier T, Geil B, Pospiech EM, Fujara F, Winter R. NMR study of translational and rotational dynamics in monoolein-water mesophases: obstruction and hydration effects. PHYSICAL REVIEW. E, STATISTICAL PHYSICS, PLASMAS, FLUIDS, AND RELATED INTERDISCIPLINARY TOPICS 2000; 62:8182-94. [PMID: 11138117 DOI: 10.1103/physreve.62.8182] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2000] [Indexed: 04/15/2023]
Abstract
Using a variety of NMR methods (magnetic field gradient echo decays, 2H one- and two-dimensional spectra, spin-lattice relaxation rates), both translational and rotational dynamics of the constituents of monoolein MO/H(2)O mesophases have been studied. The experiments lead to the following conclusions. The translational dynamics of the lipid molecules is essentially dominated by obstruction effects due to the topologies of the diverse mesophases. On the other hand, water dynamics-in the regime of small water concentrations-is strongly influenced by hydration of the lipid head groups. Hydration is seen in diffusion data, in spectra and in spin-lattice relaxation of the water molecules. This work represents an involved extension of our recently published work [Chem. Phys. Lipids 106, 115 (2000)].
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Affiliation(s)
- T Feiweier
- Fachbereich Physik, Universitat Dortmund, D-44221 Dortmund, Germany and Siemens AG, D-91058 Erlangen, Germany
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Geil B, Feiweier T, Pospiech EM, Eisenblätter J, Fujara F, Winter R. Relating structure and translational dynamics in aqueous dispersions of monoolein. Chem Phys Lipids 2000; 106:115-26. [PMID: 10930564 DOI: 10.1016/s0009-3084(00)00136-5] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The temperature dependence of the molecular diffusion in monoolein/water systems is investigated at several levels of hydration. Using the proton/deuteron selectivity, field gradient NMR allows the simultaneous determination of the diffusion constants of both, lipid and water molecules in the various lamellar and non-lamellar phases. Due to the mesoscopic structure of the monoolein/water phases, the diffusion coefficients are interpreted as 'reduced' or 'effective' diffusion coefficients, and are related to the microscopic molecular displacements by a so-called 'obstruction factor'. Changes in the microscopic structure at the phase transition from the bicontinuous cubic phases to the inverse hexagonal phase are reflected in the obstruction factor of the monoolein diffusion coefficients. The reduction of the water diffusion coefficients is too high to be explained by an obstruction factor only, implying a mechanism of molecular motion, which strongly differs from that of bulk water. Experiments on samples prepared with isotopic labeled water (2H(2)O and H(2)(17)O) indicate a chemical exchange of protons between the water molecules and the lipid headgroups on a millisecond timescale.
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Affiliation(s)
- B Geil
- Fachbereich Physik, Universität Dortmund, D-44221, Dortmund, Germany.
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29
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Binder H, Anikin A, Lantzsch G, Klose G. Lyotropic Phase Behavior and Gel State Polymorphism of Phospholipids with Terminal Diene Groups: Infrared Measurements on Molecular Ordering in Lamellar and Hexagonal Phases. J Phys Chem B 1998. [DOI: 10.1021/jp981909v] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- H. Binder
- Universität Leipzig, Institut für Experimentelle Physik I, Linnèstr.5, D-4103 Leipzig, Germany
| | - A. Anikin
- Universität Leipzig, Institut für Experimentelle Physik I, Linnèstr.5, D-4103 Leipzig, Germany
| | - G. Lantzsch
- Universität Leipzig, Institut für Experimentelle Physik I, Linnèstr.5, D-4103 Leipzig, Germany
| | - G. Klose
- Universität Leipzig, Institut für Experimentelle Physik I, Linnèstr.5, D-4103 Leipzig, Germany
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Compound Complex Formation in Phospholipid Membranes Induced by a Nonionic Surfactant of the Oligo(ethylene oxide)–Alkyl Ether Type: A Comparative DSC and FTIR Study. J Colloid Interface Sci 1998. [DOI: 10.1006/jcis.1998.5416] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Razumas V, Talaikyte Z, Barauskas J, Larsson K, Miezis Y, Nylander T. Effects of distearoylphosphatidylglycerol and lysozyme on the structure of the monoolein-water cubic phase: X-ray diffraction and Raman scattering studies. Chem Phys Lipids 1996; 84:123-88. [PMID: 9022219 DOI: 10.1016/s0009-3084(96)02629-1] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
X-ray diffraction and Raman scattering spectroscopy have been used to study phase transitions and changes in molecular organization of the cubic Pn3m monoolein (MO)-H2O phase upon introducing low amounts of distearoylphosphatidylglycerol (DSPG) and lysozyme (LSZ). X-ray diffraction measurements indicated a phase transition Pn3m-Im3m brought about by DSPG and LSZ, however DSPG also induced formation of the lamellar phase. Raman spectra have demonstrated that incorporation of DSPG into the lipid bilayer decreases the mobility of acyl chains and increases the number of hydrogen-bonded C=O groups of MO. On the other hand, LSZ exerts identical effect on the latter parameter, while no effect on the state of acyl chains order was observed. This result and differential scanning calorimetric measurements indicate that LSZ is located in the water channel system of the cubic phase. The results are discussed on the basis of an infinite periodical lipid bilayer structure and lipid parameter concepts.
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Affiliation(s)
- V Razumas
- Department of Bioelectrochemistry, Institute of Biochemistry, Vilnius, Lithuania.
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Lesile SB, Puvvada S, Ratna BR, Rudolph AS. Encapsulation of hemoglobin in a bicontinuous cubic phase lipid. BIOCHIMICA ET BIOPHYSICA ACTA 1996; 1285:246-54. [PMID: 8972709 DOI: 10.1016/s0005-2736(96)00169-1] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
The effects of encapsulating bovine hemoglobin (BHb) in the bicontinuous cubic phase formed by monooleoylglycerol and water was investigated with Fourier transform infrared (FTIR) spectroscopy and X-ray diffraction. Cubic phase was formed in the presence of 1-10 wt% BHb. Studies using X-ray diffraction reveal that at 0.5-2.5 wt% BHb, the cubic phase structure is characterized by the double diamond lattice (Pn3m). At 2.5-5 wt% BHb, coexistence of two cubic phase structures, Pn3m and the gyroid lattice (Ia3d), was observed while at BHb, concentrations higher than 5 wt% the gyroid structure persists. FTIR shows there is an increase in intensity of the free nu C = O (1745 cm-1) and a corresponding decrease in the intensity of the hydrogen bonded nu C = O (1720 cm-1) as the BHb concentration is increased. The nu C-O-CO peak shifts from 1183 cm-1 to 1181 cm-1 as the concentration of BHb raised from 2.5 to 10 wt% indicating BHb may induce subtle changes in the interfacial region of cubic phase monoolein. The bandwidth of the nu asCH2 stretch (2926 cm-1) increased in the presence of 5 wt% BHb compared to samples with 2.5 or 10 wt% BHb. The increase in frequency of the nu sCH2 stretch (2854 cm-1) induced by increasing temperature 20 to 60 degrees C was dampened when BHb was present compared to samples heated in isotonic buffer. Analysis of the amide I band at 1650 cm-1 showed that the secondary structure of BHb is not affected by encapsulation in monoolein. In vitro release studies showed that 45% of the entrapped BHb was released after 144 h at 37 degrees C. The porous nature of bulk cubic phase was further demonstrated by diffusion of K2Fe(CN)6 and conversion of 73% of the oxyhemoglobin to methemoglobin after 1 h. These results suggest that the cubic phase may be useful for encapsulation of Hb as a red cell substitute and for the encapsulation and delivery of other bioactive agents.
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Affiliation(s)
- S B Lesile
- Center for Biomolecular Science and Engineering, Naval Research Laboratory, Washington, DC 20375-5002, USA
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Razumas V, Larsson K, Miezis Y, Nylander T. A Cubic Monoolein−Cytochrome c−Water Phase: X-ray Diffraction, FT-IR, Differential Scanning Calorimetric, and Electrochemical Studies. ACTA ACUST UNITED AC 1996. [DOI: 10.1021/jp952613h] [Citation(s) in RCA: 107] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
| | - Kåre Larsson
- Department of Food Technology, Chemical Center, University of Lund, P.O. Box 124, S-221 00 Lund, Sweden
| | - Yvonne Miezis
- Department of Food Technology, Chemical Center, University of Lund, P.O. Box 124, S-221 00 Lund, Sweden
| | - Tommy Nylander
- Department of Food Technology, Chemical Center, University of Lund, P.O. Box 124, S-221 00 Lund, Sweden
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