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Zahid NI, Salim M, Liew CY, Boyd BJ, Hashim R. Structural investigation and steric stabilisation of Guerbet glycolipid-based cubosomes and hexosomes using triblock polyethylene oxide-polypropylene oxide-polyethylene oxide copolymers. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.129212] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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2
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Ishak KA, Safian NAM, Kamal SAA, Velayutham TS, Annuar MSM. Free-radical copolymerization of biological medium-chain-length poly-3-hydroxyalkanoate with poly-methyl acrylate under ultrasonication. JOURNAL OF POLYMER RESEARCH 2022. [DOI: 10.1007/s10965-022-03252-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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3
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Stability of cubic phase and curvature tuning in the lyotropic system of branched chain galactose-based glycolipid by amphiphilic additives. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2021.126697] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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Li X, Zhao K. Phase transition and electrical properties of aggregations of ethoxylated phytosterol surfactants by dielectric spectroscopy. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2018; 30:505402. [PMID: 30465540 DOI: 10.1088/1361-648x/aaebe2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The aggregation behaviors of the bio-friendly nonionic phytosterol ethoxylated (BPS-n) surfactants, in water were investigated by dielectric spectroscopy over a frequency range from 40 Hz to 110 MHz. Only the BPS-5 solution system observes dielectric relaxation and we judge this is because due to the difference in the chain length of BPS-n surfactants. Then we further analyze the BPS-5 solution system. Interestingly, we found that BPS-5 lamellar aggregations exist two phases before and after 6%-8% BPS-5 concentration by using the dielectric parameters and the phase parameters obtained by fitting dielectric spectrum and the theoretical model respectively. In addition, we concluded that the change of the electrical parameters such as surface conductivity and zeta potential are related to the lamellar phase structure. Besides, lamellar phases formed at a lower concentration are more stable than those at higher concentration by the thermodynamic analysis.
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Affiliation(s)
- Xue Li
- College of Chemistry, Beijing Normal University, Beijing 100875, People's Republic of China
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Hashim R, Sugimura A, Nguan HS, Rahman M, Zimmermann H. Anhydrous octyl-glucoside phase transition from lamellar to isotropic induced by electric and magnetic fields. J Chem Phys 2018; 146:084702. [PMID: 28249421 DOI: 10.1063/1.4976979] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
A static deuterium nuclear magnetic resonance (2HNMR) technique (magnetic field, B = 7.05 T) was employed to monitor the thermotropic lamellar phase of the anhydrous 1:1 mixture sample of octyl-b-D-glucoside (βOG) and that of partially deuterium labelled at the alpha position on the chain, i.e.,βOG-d2 In the absence of an electric field, the 2H NMR spectrum of the mixture gives a typical quadrupolar doublet representing the aligned lamellar phase. Upon heating to beyond the clearing temperature at 112 °C, this splitting converts to a single line expected for an isotropic phase. Simultaneous application of magnetic and electric fields (E = 0.4 MV/m) at 85 °C in the lamellar phase, whose direction was set to be parallel or perpendicular to the magnetic field, resulted in the change of the doublet into a single line and this recovers to the initial doublet with time for both experimental geometries. This implies E- and B-field-induced phase transitions from the lamellar to an isotropic phase and a recovery to the lamellar phase again with time. Moreover, these phase transformations are accompanied by a transient current. A similar observation was made in a computational study when an electric field was applied to a water cluster system. Increasing the field strength distorts the water cluster and weakens its hydrogen bonds leading to a structural breakdown beyond a threshold field-strength. Therefore, we suggest the observed field-induced transition is likely due to a structure change of the βOG lamellar assembly caused by the field effect and not due to Joule heating.
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Affiliation(s)
- Rauzah Hashim
- Centre of Fundamental and Frontier Science of Self-Assembly, Department of Chemistry, University of Malaya, 50603 Kuala Lumpur, Malaysia
| | - Akihiko Sugimura
- School of Information Systems Engineering, Osaka Sangyo University, 3-1-1 Nakagaito, Daito-Shi, Osaka 574-8530, Japan
| | - Hock-Seng Nguan
- Centre of Fundamental and Frontier Science of Self-Assembly, Department of Chemistry, University of Malaya, 50603 Kuala Lumpur, Malaysia
| | - Matiur Rahman
- Centre of Fundamental and Frontier Science of Self-Assembly, Department of Chemistry, University of Malaya, 50603 Kuala Lumpur, Malaysia
| | - Herbert Zimmermann
- Department of Biophysics, Max-Planck-Institut für Medizinische Forschung, Jahnstrasse 29, D-69120 Heidelberg, Germany
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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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Affiliation(s)
- Ling Wang
- Artie McFerrin Department of Chemical Engineering, Texas A&M University, College Station, TX, USA
| | - Dali Huang
- Artie McFerrin Department of Chemical Engineering, Texas A&M University, College Station, TX, USA
| | - Lui Lam
- Department of Physics and Astronomy, San Jose State University, San Jose, CA, USA
| | - Zhengdong Cheng
- Artie McFerrin Department of Chemical Engineering, Texas A&M University, College Station, TX, USA
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Chen G, Li Z, Chen L, Ji S, Shen W. Synthesis and properties of Alkyl α-D-Galactopyranoside. J DISPER SCI TECHNOL 2016. [DOI: 10.1080/01932691.2016.1180628] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Guoyong Chen
- College of Chemistry, Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education, Xiangtan University, Xiangtan, Hunan, People's Republic of China
| | - Zhencao Li
- College of Chemistry, Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education, Xiangtan University, Xiangtan, Hunan, People's Republic of China
| | - Langqiu Chen
- College of Chemistry, Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education, Xiangtan University, Xiangtan, Hunan, People's Republic of China
| | - Shanwei Ji
- College of Chemistry, Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education, Xiangtan University, Xiangtan, Hunan, People's Republic of China
| | - Wangzhen Shen
- College of Chemistry, Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education, Xiangtan University, Xiangtan, Hunan, People's Republic of China
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Velayutham TS, Nguan HS, Ng BK, Gan WC, Manickam Achari V, Zahid NI, Abd. Majid WH, Zannoni C, Hashim R. Molecular dynamics of anhydrous glycolipid self-assembly in lamellar and hexagonal phases. Phys Chem Chem Phys 2016; 18:15182-90. [DOI: 10.1039/c6cp00583g] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The molecular dynamics of a synthetic branched chain glycolipid, 2-decyl-tetradecyl-β-d-maltoside (C14-10G2), in smectic and columnar liquid crystal phases.
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Affiliation(s)
- T. S. Velayutham
- Low Dimensional Materials Research Center
- Faculty of Science
- University Malaya
- 50603 Kuala Lumpur
- Malaysia
| | - H. S. Nguan
- Fundamental and Frontier Science of Self-Assembly Center
- Faculty of Science
- University Malaya
- 50603 Kuala Lumpur
- Malaysia
| | - B. K. Ng
- Low Dimensional Materials Research Center
- Faculty of Science
- University Malaya
- 50603 Kuala Lumpur
- Malaysia
| | - W. C. Gan
- Low Dimensional Materials Research Center
- Faculty of Science
- University Malaya
- 50603 Kuala Lumpur
- Malaysia
| | - V. Manickam Achari
- Fundamental and Frontier Science of Self-Assembly Center
- Faculty of Science
- University Malaya
- 50603 Kuala Lumpur
- Malaysia
| | - N. I. Zahid
- Fundamental and Frontier Science of Self-Assembly Center
- Faculty of Science
- University Malaya
- 50603 Kuala Lumpur
- Malaysia
| | - W. H. Abd. Majid
- Low Dimensional Materials Research Center
- Faculty of Science
- University Malaya
- 50603 Kuala Lumpur
- Malaysia
| | - C. Zannoni
- Dipartimento di Chimica Industriale “Toso Montanari” viale Risorgimento 4 Universita' di Bologna
- 40136 Bologna
- Italy
| | - R. Hashim
- Fundamental and Frontier Science of Self-Assembly Center
- Faculty of Science
- University Malaya
- 50603 Kuala Lumpur
- Malaysia
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Delbianco M, Bharate P, Varela-Aramburu S, Seeberger PH. Carbohydrates in Supramolecular Chemistry. Chem Rev 2015; 116:1693-752. [PMID: 26702928 DOI: 10.1021/acs.chemrev.5b00516] [Citation(s) in RCA: 191] [Impact Index Per Article: 21.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Carbohydrates are involved in a variety of biological processes. The ability of sugars to form a large number of hydrogen bonds has made them important components for supramolecular chemistry. We discuss recent advances in the use of carbohydrates in supramolecular chemistry and reveal that carbohydrates are useful building blocks for the stabilization of complex architectures. Systems are presented according to the scaffold that supports the glyco-conjugate: organic macrocycles, dendrimers, nanomaterials, and polymers are considered. Glyco-conjugates can form host-guest complexes, and can self-assemble by using carbohydrate-carbohydrate interactions and other weak interactions such as π-π interactions. Finally, complex supramolecular architectures based on carbohydrate-protein interactions are discussed.
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Affiliation(s)
- Martina Delbianco
- Department of Biomolecular Systems, Max-Planck-Institute of Colloids and Interfaces , Am Mühlenberg 1, 14476 Potsdam, Germany
| | - Priya Bharate
- Department of Biomolecular Systems, Max-Planck-Institute of Colloids and Interfaces , Am Mühlenberg 1, 14476 Potsdam, Germany.,Institute of Chemistry and Biochemistry, Freie Universität Berlin , Arnimallee 22, 14195 Berlin, Germany
| | - Silvia Varela-Aramburu
- Department of Biomolecular Systems, Max-Planck-Institute of Colloids and Interfaces , Am Mühlenberg 1, 14476 Potsdam, Germany.,Institute of Chemistry and Biochemistry, Freie Universität Berlin , Arnimallee 22, 14195 Berlin, Germany
| | - Peter H Seeberger
- Department of Biomolecular Systems, Max-Planck-Institute of Colloids and Interfaces , Am Mühlenberg 1, 14476 Potsdam, Germany.,Institute of Chemistry and Biochemistry, Freie Universität Berlin , Arnimallee 22, 14195 Berlin, Germany
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