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Thermal Behaviour of Cubic Phases Rich in 1-monooleoyl-rac-glycerol in the ternary system 1-monooleoyl-rac-glycerol / n-octyl-b-D-glucoside / Water.
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
2003 (English)In: European Journal of Biochemistry, ISSN 0014-2956, Vol. 270, no 1, 56-65 p.Article in journal (Refereed) Published
Abstract [en]

Using synchrotron X-ray diffraction the thermal behaviour was studied of the cubic phases in the 1-monooleoyl-rac -glycerol (MO)/n-octyl-beta-d-glucopyranoside (OG)/(2) H-2 O system with 58 or 45 wt % MO concentration and varying OG/(H2O)-H-2 contents. These MO contents correspond to a Pn3m cubic single-phase or a Pn3m cubic phase in excess water on the binary MO/water axis of the ternary phase diagram. The cubic liquid crystalline phases are stable with small fractions of OG, while higher OG concentrations trigger a cubic-to-lamellar phase transition. Moreover, with increasing OG concentration the initial Pn3m structure is completely converted to an Ia3d structure prior to the L-alpha phase being formed. Upon heating this effect is reversed, resulting in an Ia3d -to-Pn3m phase transition. For some samples additional peaks were observed in the diffractograms upon heating, resulting from the metastability notoriously shown by bicontinuous cubic phases. This judgement is supported by the fact that upon cooling these peaks were absent. Remarkably, both the Ia3d and the Pn3m cubic structures could be in equilibrium with excess water in this ternary system. A comparison is made with previous results on n -dodecyl-beta-d-maltoside (DM), showing that cubic phases with OG have higher thermal and compositional stability than with DM

Place, publisher, year, edition, pages
2003. Vol. 270, no 1, 56-65 p.
Keyword [sv]
surfaktanter
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:miun:diva-1839ISI: 000179924900007Scopus ID: 2-s2.0-0037219974Local ID: 603OAI: oai:DiVA.org:miun-1839DiVA: diva2:26871
Available from: 2008-09-30 Created: 2008-09-30 Last updated: 2016-10-21Bibliographically approved

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Persson, GerdEdlund, Håkan
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