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Das S, Zheng C, Lodge TP, Siepmann JI, Mahanthappa MK, Calabrese MA, Reineke TM. Self-Assembly of Unusually Stable Thermotropic Network Phases by Cellobiose-Based Guerbet Glycolipids. Biomacromolecules 2024; 25:1291-1302. [PMID: 38170593 DOI: 10.1021/acs.biomac.3c01266] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2024]
Abstract
Bicontinuous thermotropic liquid crystal (LC) materials, e.g., double gyroid (DG) phases, have garnered significant attention due to the potential utility of their 3D network structures in wide-ranging applications. However, the utility of these materials is significantly constrained by the lack of robust molecular design rules for shape-filling amphiphiles that spontaneously adopt the saddle curvatures required to access these useful supramolecular assemblies. Toward this aim, we synthesized anomerically pure Guerbet-type glycolipids bearing cellobiose head groups and branched alkyl tails and studied their thermotropic LC self-assembly. Using a combination of differential scanning calorimetry, polarized optical microscopy, and small-angle X-ray scattering, our studies demonstrate that Guerbet cellobiosides exhibit a strong propensity to self-assemble into DG morphologies over wide thermotropic phase windows. The stabilities of these assemblies sensitively depend on the branched alkyl tail structure and the anomeric configuration of the glycolipid in a previously unrecognized manner. Complementary molecular simulations furnish detailed insights into the observed self-assembly characteristics, thus unveiling molecular motifs that foster network phase self-assembly that will enable future designs and applications of network LC materials.
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Affiliation(s)
- Soumi Das
- Department of Chemistry, University of Minnesota Twin Cities, 207 Pleasant St SE, Minneapolis, Minnesota 55455, United States
| | - Caini Zheng
- Department of Chemistry, University of Minnesota Twin Cities, 207 Pleasant St SE, Minneapolis, Minnesota 55455, United States
| | - Timothy P Lodge
- Department of Chemistry, University of Minnesota Twin Cities, 207 Pleasant St SE, Minneapolis, Minnesota 55455, United States
- Department of Chemical Engineering and Materials Science, University of Minnesota Twin Cities, 421 Washington Avenue SE #151, Minneapolis, Minnesota 55455, United States
| | - J Ilja Siepmann
- Department of Chemistry, University of Minnesota Twin Cities, 207 Pleasant St SE, Minneapolis, Minnesota 55455, United States
| | - Mahesh K Mahanthappa
- Department of Chemical Engineering and Materials Science, University of Minnesota Twin Cities, 421 Washington Avenue SE #151, Minneapolis, Minnesota 55455, United States
| | - Michelle A Calabrese
- Department of Chemical Engineering and Materials Science, University of Minnesota Twin Cities, 421 Washington Avenue SE #151, Minneapolis, Minnesota 55455, United States
| | - Theresa M Reineke
- Department of Chemistry, University of Minnesota Twin Cities, 207 Pleasant St SE, Minneapolis, Minnesota 55455, United States
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Falaise C, Khlifi S, Bauduin P, Schmid P, Degrouard J, Leforestier A, Shepard W, Marrot J, Haouas M, Landy D, Mellot-Draznieks C, Cadot E. Cooperative Self-Assembly Process Involving Giant Toroidal Polyoxometalate as a Membrane Building Block in Nanoscale Vesicles. J Am Chem Soc 2024; 146:1501-1511. [PMID: 38189235 DOI: 10.1021/jacs.3c11004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2024]
Abstract
The self-assembly of organic amphiphilic species into various aggregates such as spherical or elongated micelles and cylinders up to the formation of lyotropic hexagonal or lamellar phases results from cooperative processes orchestrated by the hydrophobic effect, while those involving ionic inorganic polynuclear entities and nonionic organic components are still intriguing. Herein, we report on the supramolecular behavior of giant toroidal molybdenum blue-type polyoxometalate, namely, the {Mo154} species in the presence of n-octyl-β-glucoside (C8G1), widely used as a surfactant in biochemistry. Structural investigations were carried out using a set of complementary multiscale methods including single-crystal X-ray diffraction analysis supported by molecular modeling, small-angle X-ray scattering and cryo-TEM observations. In addition, liquid NMR, viscosimetry, surface tension measurement, and isothermal titration calorimetry provided further information to decipher the complex aggregation pathway. Elucidation of the assembly process reveals a rich scenario where the presence of the large {Mo154} anion disrupts the self-assembly of the C8G1, well-known to produce micelles, and induces striking successive phase transitions from fluid-to-gel and from gel-to-fluid. Herein, intimate organic-inorganic primary interactions arising from the superchaotropic nature of the {Mo154} lead to versatile nanoscopic hybrid C8G1-{Mo154} aggregates including crystalline discrete assemblies, smectic lamellar liquid crystals, and large uni- or multilamellar vesicles where the large torus {Mo154} acts a trans-membrane component.
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Affiliation(s)
- Clément Falaise
- Institut Lavoisier de Versailles, CNRS, UVSQ, Université Paris-Saclay, Versailles 78035, France
| | - Soumaya Khlifi
- Institut Lavoisier de Versailles, CNRS, UVSQ, Université Paris-Saclay, Versailles 78035, France
| | - Pierre Bauduin
- ICSM, CEA, CNRS, ENSCM, Université Montpellier, Marcoule 34199, France
| | - Philipp Schmid
- ICSM, CEA, CNRS, ENSCM, Université Montpellier, Marcoule 34199, France
| | - Jéril Degrouard
- Université Paris-Saclay, CNRS, Laboratoire de Physique des Solides, Orsay 91405, France
| | - Amélie Leforestier
- Université Paris-Saclay, CNRS, Laboratoire de Physique des Solides, Orsay 91405, France
| | - William Shepard
- Synchrotron SOLEIL, L'Orme des Merisiers, Départementale 128, 91190 Saint-Aubin, France
| | - Jérôme Marrot
- Institut Lavoisier de Versailles, CNRS, UVSQ, Université Paris-Saclay, Versailles 78035, France
| | - Mohamed Haouas
- Institut Lavoisier de Versailles, CNRS, UVSQ, Université Paris-Saclay, Versailles 78035, France
| | - David Landy
- Unité de Chimie Environnementale et Interactions sur le Vivant (UCEIV, EA 4492), ULCO, Dunkerque 59140, France
| | - Caroline Mellot-Draznieks
- Laboratoire de Chimie des Processus Biologiques, UMR CNRS 8229, Collège de France, Sorbonne Université, PSL Research University, Paris, Cedex 05 75231, France
| | - Emmanuel Cadot
- Institut Lavoisier de Versailles, CNRS, UVSQ, Université Paris-Saclay, Versailles 78035, France
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Ogawa S, Hirase R, Ohishi T, Hara S, Takahashi I. Thermal Behavior of Anhydrous Ascorbic Acid 6‐Palmitate with Trace of Decomposition. ChemistrySelect 2020. [DOI: 10.1002/slct.202002800] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Shigesaburo Ogawa
- Faculty of Science and Technology Seikei University 3-3-1 Kichijojikitamachi Musashino Tokyo 180-8633 Japan
| | - Ryuji Hirase
- Hyogo Prefectural Institute of Technology 3-1-12 Yukihira-cho, Suma Kobe 654-0037 Japan
| | - Tomoyuki Ohishi
- Faculty of Science and Technology Seikei University 3-3-1 Kichijojikitamachi Musashino Tokyo 180-8633 Japan
| | - Setsuko Hara
- Faculty of Science and Technology Seikei University 3-3-1 Kichijojikitamachi Musashino Tokyo 180-8633 Japan
| | - Isao Takahashi
- School of Science and Technology Kwansei Gakuin University 2-1 Gakuen Sanda Hyogo 669-1337 Japan
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Ogawa S, Ono Y, Takahashi I. Glass transition behavior of perpendicularly aligned thermotropic liquid crystalline phases consisting of long-chain trehalose lipids. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2019.111954] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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5
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Raju R, Merl T, Adam MK, Staykov E, Ben RN, Bryant G, Wilkinson BL. n-Octyl (Thio)glycosides as Potential Cryoprotectants: Glass Transition Behaviour, Membrane Permeability, and Ice Recrystallization Inhibition Studies. Aust J Chem 2019. [DOI: 10.1071/ch19159] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
A series of eight n-octyl (thio)glycosides (1α, β–4α, β) with d-glucose or d-galactose-configured head groups and varying anomeric configuration were synthesized and evaluated for glass transition behaviour, membrane permeability, and ice recrystallization inhibition (IRI) activity. Of these, n-octyl β-d-glucopyranoside (2β) exhibited a high glass transition temperatures (Tg), both as a neat sample and 20 wt-% aqueous solution. Membrane permeability studies of this compound revealed cellular uptake to concentrations relevant to the inhibition of intracellular ice formation, thus presenting a promising lead candidate for further biophysical and cryopreservation studies. Compounds were also evaluated as ice recrystallization inhibitors; however, no detectable activity was observed for the newly tested compounds.
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Ogawa S, Honda K, Tsubomura T, Totani K, Takahashi I, Hara S. Physicochemical characterization of 6-O-acyl trehalose fatty acid monoesters in desiccated system. Chem Phys Lipids 2018; 216:80-90. [DOI: 10.1016/j.chemphyslip.2018.09.012] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2018] [Revised: 09/10/2018] [Accepted: 09/19/2018] [Indexed: 10/28/2022]
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7
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Hashim R, Zahid NI, Velayutham TS, Aripin NFK, Ogawa S, Sugimura A. Dry Thermotropic Glycolipid Self-Assembly:A Review. J Oleo Sci 2018; 67:651-668. [PMID: 29760332 DOI: 10.5650/jos.ess17261] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Also recognized as carbohydrate liquid crystals, glycolipids are amphiphiles whose basic unit comprises of a sugar group attached to an alkyl chain. Glycolipids are amphitropic, which means these materials form liquid crystal self-assemblies when dry (thermotropic) as well as when dissolved in solvents (lyotropic/surfactants) such as water. Many glycolipids are also naturally derived since these can be found in cell membranes. Their membrane and surfactant functions are largely understood through their lyotropic properties. While glycolipids are expected to play major roles as eco-friendly surfactants in the global surfactant market, their usefulness as thermotropic liquid crystal material is, to date, unknown, due to relatively lack of research performed and data reported in the literature. Understandably since glycolipids are hygroscopic with many hydroxy groups, removing the last trace water is very challenging. In recent time, with careful lyophilization and more consistent characterization technique, some researchers have attempted serious studies into "dry" or anhydrous glycolipids. Motivated by possible developments of novel thermotropic applications, some results from these studies also provide surprising new understanding to support conventional wisdom of the lyotropic systems. Here we review the dry state of glycosides, a family of glycolipids whose sugar headgroup is linked to the lipid chain via a glycosidic oxygen linker. The structure property relationship of both linear and anhydrous Guerbet glycosides will be examined. In particular, how the variation of sugar stereochemistry (e.g. anomer vs. epimer), the chain length and chain branching affect the formation of thermotropic liquid crystals phases, which not only located under equilibrium but also far from equilibrium conditions (glassy phase) are scrutinized. The dry glycolipid assembly has been subjected to electric and magnetic fields and the results show interesting behaviors including a possible transient current generation.
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Affiliation(s)
- Rauzah Hashim
- Centre for Fundamental and Frontier Sciences in Nanostructure Self-Assembly, Department of Chemistry, Faculty of Science, University of Malaya
| | - N Idayu Zahid
- Centre for Fundamental and Frontier Sciences in Nanostructure Self-Assembly, Department of Chemistry, Faculty of Science, University of Malaya
| | - T S Velayutham
- Low Dimensional Materials Research Center, Department of Physics, Faculty of Science, University of Malaya
| | | | | | - Akihiko Sugimura
- School of Information Systems Engineering, Osaka Sangyo University
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Ogawa S, Ozaki Y, Takahashi I. Structural Insights into Solid-to-Solid Phase Transition and Modulated Crystal Formation in Octyl-β-d-Galactoside Crystals. Chemphyschem 2016; 17:2808-12. [DOI: 10.1002/cphc.201600400] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2016] [Indexed: 11/08/2022]
Affiliation(s)
- Shigesaburo Ogawa
- School of Science and Technology; Kwansei Gakuin University; Sanda Hyogo 669-1337 Japan
| | - Yukihiro Ozaki
- School of Science and Technology; Kwansei Gakuin University; Sanda Hyogo 669-1337 Japan
| | - Isao Takahashi
- School of Science and Technology; Kwansei Gakuin University; Sanda Hyogo 669-1337 Japan
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9
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Saeki M, Dai K, Ichimura S, Tamaki Y, Tomono K, Miyamura K. Odd–Even Effect Observed in [Ni(dmit) 2] Complex Salts of Quaternary Ammonium Cation with Both Benzyl Groups and ω-Phenylalkyl Groups. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2015. [DOI: 10.1246/bcsj.20140309] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Masahiro Saeki
- Department of Chemical Sciences and Technology, Graduate School of Chemical Sciences and Technology, Tokyo University of Science
| | - Kotaro Dai
- Department of Chemical Sciences and Technology, Graduate School of Chemical Sciences and Technology, Tokyo University of Science
| | - Shuhei Ichimura
- Department of Chemical Sciences and Technology, Graduate School of Chemical Sciences and Technology, Tokyo University of Science
| | - Yoshinori Tamaki
- Department of Chemical Sciences and Technology, Graduate School of Chemical Sciences and Technology, Tokyo University of Science
| | - Kazuaki Tomono
- Department of Chemical and Biological Engineering, Ube National College of Technology
| | - Kazuo Miyamura
- Department of Chemical Sciences and Technology, Graduate School of Chemical Sciences and Technology, Tokyo University of Science
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10
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Ogawa S, Asakura K, Osanai S. Thermotropic and glass transition behaviors of n-alkyl β-d-glucosides. RSC Adv 2013. [DOI: 10.1039/c3ra43187h] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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11
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Xu W, Osei-Prempeh G, Lema C, Davis Oldham E, Aguilera RJ, Parkin S, Rankin SE, Knutson BL, Lehmler HJ. Synthesis, thermal properties, and cytotoxicity evaluation of hydrocarbon and fluorocarbon alkyl β-D-xylopyranoside surfactants. Carbohydr Res 2011; 349:12-23. [PMID: 22207000 DOI: 10.1016/j.carres.2011.11.020] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2011] [Revised: 11/17/2011] [Accepted: 11/22/2011] [Indexed: 11/18/2022]
Abstract
Alkyl β-d-xylopyranosides are highly surface active, biodegradable surfactants that can be prepared from hemicelluloses and are of interest for use as pharmaceuticals, detergents, agrochemicals, and personal care products. To gain further insights into their structure-property and structure-activity relationships, the present study synthesized a series of hydrocarbon (-C(6)H(13) to -C(16)H(33)) and fluorocarbon (-(CH(2))(2)C(6)F(13)) alkyl β-d-xylopyranosides in four steps from d-xylose by acylation or benzoylation, bromination, Koenigs-Knorr reaction, and hydrolysis, with the benzoyl protecting group giving better yields compared to the acyl group in the Koenigs-Knorr reaction. All alkyl β-d-xylopyranosides formed thermotropic liquid crystals. The phase transition of the solid crystalline phase to a liquid crystalline phase increased linearly with the length of the hydrophobic tail. The clearing points were near constant for alkyl β-d-xylopyranosides with a hydrophobic tail ⩾8, but occurred at a significantly lower temperature for hexyl β-d-xylopyranoside. Short and long-chain alkyl β-d-xylopyranosides displayed no cytotoxicity at concentration below their aqueous solubility limit. Hydrocarbon and fluorocarbon alkyl β-d-xylopyranosides with intermediate chain length displayed some toxicity at millimolar concentrations due to apoptosis.
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Affiliation(s)
- Wenjin Xu
- Department of Occupational and Environmental Health, The University of Iowa, UI Research Park, 124 IREH, Iowa City, IA 52242, USA
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12
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Glass transition behavior of octyl β-d-glucoside and octyl β-d-thioglucoside/water binary mixtures. Carbohydr Res 2010; 345:2534-41. [DOI: 10.1016/j.carres.2010.08.004] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2009] [Revised: 07/30/2010] [Accepted: 08/10/2010] [Indexed: 11/22/2022]
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13
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Singh MK, Jayaraman N, Rao DSS, Prasad SK. Role of hydroxyl group on the mesomorphism of alkyl glycosides: synthesis and thermal behavior of alkyl 6-deoxy-beta-D-glucopyranosides. Chem Phys Lipids 2010; 163:580-5. [PMID: 20417194 DOI: 10.1016/j.chemphyslip.2010.04.006] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2010] [Revised: 03/31/2010] [Accepted: 04/15/2010] [Indexed: 11/25/2022]
Abstract
A homologous series of alkyl 6-deoxy-beta-d-glucopyranoside amphiphiles was prepared, in an effort to identify the role of hydroxyl group in the mesomorphic behavior of alkyl glycosides. Synthesis was performed by a chlorination of the sugar moiety in alkyl beta-d-glucopyranosides with methylsulfonyl chloride in DMF, followed by a metal mediated dehalogenation to secure alkyl 6-deoxy-beta-d-glucopyranosides, wherein the alkyl chain length varied from C(9) to C(16). The mesomorphic behavior of these 6-deoxy alkyl glycosides was assessed using polarizing optical microscopy, differential scanning calorimetry and X-ray diffraction method. Whereas the lower homologues exhibited a monotropic SmA phase till sub-ambient temperatures, the higher homologues formed a plastic phase. A partial interdigitized bilayer structure of SmA phase is inferred from experimental d-spacing and computationally derived lengths of the molecules. The results were compared with those of normal alkyl glucopyranosides, retained with hydroxyl groups at C-2-C-6 carbons, and alkyl 2-deoxy-glucopyranosides, devoid of a hydroxyl group at C-2 and the comparison showed important differences in the mesomorphic behavior.
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Affiliation(s)
- Madan Kumar Singh
- Department of Organic Chemistry, Indian Institute of Science, Bangalore 560 012, India
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Lakhrissi B, Lakhrissi L, Massoui M, Essassi EM, Comelles F, Esquena J, Solans C, Rodríguez-Abreu C. Surface and Self-Aggregation Properties of Bis-Benzimidazolones Derivatives of d-Glucose. J SURFACTANTS DETERG 2010. [DOI: 10.1007/s11743-010-1183-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Singh MK, Swain D, Guru Row TN, Jayaraman N. Crystal structures and thermal analyses of alkyl 2-deoxy-alpha-d-arabino-hexopyranosides. Carbohydr Res 2009; 344:1993-8. [PMID: 19698940 DOI: 10.1016/j.carres.2009.06.024] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2009] [Revised: 06/09/2009] [Accepted: 06/19/2009] [Indexed: 11/16/2022]
Abstract
The crystal structures of alkyl 2-deoxy-alpha-d-arabino-hexopyranosides, with the alkyl chain lengths from C(8) to C(18), are established by the single crystal X-ray structural determination. The even-alkyl chain length derivatives crystallized orthorhombic, with space group P2(1)2(1)2(1), whereas the odd-alkyl chain length derivatives crystallized monoclinic, with space group P2(1). The sugar moieties retained a (4)C(1) chair conformation and the conformation of the alkyl chains was all-trans. The molecules formed a bilayer structure, in which alkyl chains were interdigitated. The hydrogen bonds, originating from the sugar moieties, were observed in adjacent layers and also within the same layer, resulting in the formation of infinite chains. The alkyl chains arranged parallel to each other and formed planar structures. The thermal properties of the alkyl 2-deoxy glucosides were analyzed further. It was observed that none of the derivatives exhibited mesomorphism. This study establishes that the absence of the hydroxyl group at C-2 of the sugar moiety results in a non-mesogenic nature of the alkyl 2-deoxy-alpha-d-glycosides, as opposed to the profound mesogenic nature of the normal alkyl glycosides.
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Affiliation(s)
- Madan Kumar Singh
- Department of Organic Chemistry, Indian Institute of Science, Bangalore, India
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Singh MK, Jayaraman N, Rao DS, Prasad SK. Effect of the C-2 hydroxyl group on the mesomorphism of alkyl glycosides: synthesis and thermotropic behavior of alkyl 2-deoxy-d-arabino-hexopyranosides. Chem Phys Lipids 2008; 155:90-7. [DOI: 10.1016/j.chemphyslip.2008.07.008] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2008] [Revised: 06/20/2008] [Accepted: 07/11/2008] [Indexed: 10/21/2022]
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17
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Manconi M, Sinico C, Valenti D, Lai F, Fadda AM. Niosomes as carriers for tretinoin. III. A study into the in vitro cutaneous delivery of vesicle-incorporated tretinoin. Int J Pharm 2006; 311:11-9. [PMID: 16439071 DOI: 10.1016/j.ijpharm.2005.11.045] [Citation(s) in RCA: 127] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2005] [Revised: 11/11/2005] [Accepted: 11/15/2005] [Indexed: 10/25/2022]
Abstract
The influence of drug thermodynamic activity and niosome composition, size, lamellarity and charge on the (trans)dermal delivery of tretinoin (TRA) was studied. For this purpose, tretinoin was incorporated at saturated and unsaturated concentrations in both multilamellar (MLV) and unilamellar (UV) vesicular formulations using two different commercial mixtures of alkyl polyglucosides: octyl-decyl polyglucoside and decyl polyglucoside. Positively and negatively charged vesicular formulations were prepared using either stearylamine or dicetylphosphate as a charge inducer. Niosomes made with polyoxyethylene (4) lauryl ether and liposomes made with soy phosphatidylcholine were also prepared and studied. Vesicular formulations were characterised by transmission electron microscopy and optical and light polarized microscopy for vesicle formation and morphology, and by dynamic laser light scattering for size distribution. The effect of the vesicular incorporation of tretinoin on its (trans)dermal delivery through the newborn pig skin was also investigated in vitro using Franz cells, in comparison with a commercial formulation of the drug (RetinA). The amount of tretinoin delivered through and accumulated in the several skin layers was detected by HPLC. Overall, obtained results showed that tretinoin cutaneous delivery is strongly affected by vesicle composition and thermodynamic activity of the drug. In particular, small, negatively charged niosomal formulations, which are saturated with tretinoin, have shown to give higher cutaneous drug retention than both liposomes and commercial formulation. Moreover, interactions between skin and vesicles seem to depend on physico-chemical properties of the main component of the vesicular bilayer.
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Affiliation(s)
- Maria Manconi
- Dipartimento Farmaco Chimico Tecnologico, Università degli Studi di Cagliari, Via Ospedale 72, 09124 Cagliari, Italy
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Ericsson CA, Ericsson LC, Ulvenlund S. Solid-state phase behaviour of dodecylglycosides. Carbohydr Res 2005; 340:1529-37. [PMID: 15882846 DOI: 10.1016/j.carres.2005.03.015] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2005] [Accepted: 03/31/2005] [Indexed: 10/25/2022]
Abstract
The solid-state phase behaviour of lyophilised n-dodecyl-beta-D-glucoside (beta-C(12)G(1)), n-dodecyl-beta-D-maltoside (beta-C(12)G(2)) and n-dodecyl-beta-D-maltotrioside (beta-C(12)G(3)) has been investigated by differential scanning calorimetry (DSC) and X-ray techniques. For beta-C(12)G(1), lyophilisation results in a formation of a crystalline anhydrate. The lamellar spacing (37 Angstroms) is consistent with an alkyl chain packing in which the chains are not interdigitated. At 80 degrees C, the material melts into a lamellar liquid crystal with a lamellar spacing of 32 Angstroms, which suggests that the non-interdigitated chain packing of the crystalline state is retained in the liquid crystal. In contrast, lyophilisation of beta-C(12)G(2) and beta-C(12)G(3) results in the formation of a glassy state, best described as a frozen version of the lamellar liquid crystal. For beta-C(12)G(2), the lamellar spacing in the glass and liquid crystal suggests interdigitation of the alkyl chains. The glass transition temperature was found to be 65 degrees C for beta-C(12)G(2) and 100 degrees C for beta-C(12)G(3), which compares favourably with the glass transition of the parent carbohydrates. A second crystalline modification of beta-C(12)G(1) was prepared by precipitation from an aqueous solution at temperatures below the Krafft point (38 degrees C). For this modification, the lamellar distance (24 Angstroms) is consistent with interdigitated alkyl chains. At 50 degrees C, the crystalline material melts into a liquid crystalline phase. The material also readily loses water and rapidly re-crystallises to the anhydrate. The amount of water lost upon drying is consistent with the idea that the material is a monohydrate of beta-C(12)G(1). The drying and re-crystallisation processes give rise to 'pre-transitions' in the DSC thermograms and illustrate the importance of careful control of water in any analysis of the phase behaviour of alkylglycosides.
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Affiliation(s)
- Caroline A Ericsson
- Department of Physical Chemistry 1, Centre of Chemistry and Chemical Engineering, Lund University, Sweden
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Ericsson CA, Ericsson LC, Kocherbitov V, Söderman O, Ulvenlund S. Thermotropic phase behaviour of long-chain alkylmaltosides. Phys Chem Chem Phys 2005; 7:2970-7. [PMID: 16189619 DOI: 10.1039/b502922h] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The thermotropic phase behaviour and phase structure of crystalline and non-crystalline n-tetradecyl-beta-D-maltoside (C14G2) and n-hexadecyl-beta-D-maltoside (C16G2) have been investigated by means of differential scanning calorimetry and X-ray techniques. Upon lyophilisation, both compounds form a solid, lamellar phase comprising disordered head groups and hexagonally packed alkyl chains that are suggested to be tilted and interdigitated. This ordered lamellar phase melts into a metastable lamellar liquid crystal, which re-crystallises to a high-temperature crystalline polymorph comprising interdigitated, non-tilted alkyl chains. Remarkably, the high-temperature polymorph of C14G2 has the same melting point as that of C16G2, namely 105 degrees C for both surfactants. A low-temperature polymorph of anhydrous C14G2 crystallises from water at room temperature, whereas the hemihydrate of C14G2 crystallises at 6 degrees C from water, or from chloroform containing trace water. X-ray data suggest both these crystalline modifications to comprise interdigitated and tilted alkyl chains.
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Affiliation(s)
- Caroline A Ericsson
- Department of Physical Chemistry 1, Centre of Chemistry and Chemical Engineering, Lund University, P.O. Box 124, S-221 00, Lund, Sweden
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