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Dry Thermotropic Glycolipid Self-Assembly:A Review.
Hashim, Rauzah; Zahid, N Idayu; Velayutham, T S; Aripin, Nurul Fadhilah Kamalul; Ogawa, Shigesaburo; Sugimura, Akihiko.
  • Hashim R; Centre for Fundamental and Frontier Sciences in Nanostructure Self-Assembly, Department of Chemistry, Faculty of Science, University of Malaya.
  • Zahid NI; Centre for Fundamental and Frontier Sciences in Nanostructure Self-Assembly, Department of Chemistry, Faculty of Science, University of Malaya.
  • Velayutham TS; Low Dimensional Materials Research Center, Department of Physics, Faculty of Science, University of Malaya.
  • Aripin NFK; Faculty of Chemical Engineering, Universiti Teknologi MARA.
  • Ogawa S; Faculty of Science and Technology, Seikei University.
  • Sugimura A; School of Information Systems Engineering, Osaka Sangyo University.
J Oleo Sci ; 67(6): 651-668, 2018 Jun 01.
Article en En | MEDLINE | ID: mdl-29760332
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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Texto completo: 1 Banco de datos: MEDLINE Asunto principal: Glucolípidos Idioma: En Año: 2018 Tipo del documento: Article

Texto completo: 1 Banco de datos: MEDLINE Asunto principal: Glucolípidos Idioma: En Año: 2018 Tipo del documento: Article