Phase behavior and rheological properties of enzymatically synthesized trehalose decanoate aqueous solutions.
Identifieur interne : 000171 ( PubMed/Curation ); précédent : 000170; suivant : 000172Phase behavior and rheological properties of enzymatically synthesized trehalose decanoate aqueous solutions.
Auteurs : L. Choplin [France] ; V. Sadtler ; P. Marchal ; D. Sfayhi ; M. Ghoul ; J-M EngasserSource :
- Journal of colloid and interface science [ 0021-9797 ] ; 2006.
Descripteurs français
- KwdFr :
- MESH :
- métabolisme : Tréhalose.
- synthèse chimique : Décanoate.
- Eau, Micelles, Propriétés de surface, Rhéologie, Réactifs réticulants, Résistance au cisaillement, Solutions, Structure moléculaire, Température, Tensioactifs, Transition de phase, Viscosité.
English descriptors
- KwdEn :
- MESH :
- chemical , chemical synthesis : Decanoates.
- chemical , chemistry : Cross-Linking Reagents, Solutions, Surface-Active Agents, Water.
- chemical , metabolism : Trehalose.
- chemical : Micelles.
- Molecular Structure, Phase Transition, Rheology, Shear Strength, Surface Properties, Temperature, Viscosity.
Abstract
Surface tension properties of an enzymatically synthesized equimolar mixture of trehalose mono- and didecanoate in aqueous solutions have been determined. At 20 degrees C a critical micellar concentration (CMC) of 50 micromol/l and a minimal surface tension of 28 mN/m have been obtained. Above the CMC, it has been shown that up to a concentration of 42 wt%, and in a 20-60 degrees C temperature range the sugar ester aqueous solutions do not form any crystalline structure, nor present any phase transition, and the trehalose decanoate molecules form an isotropic worm-like micellar phase. The rheological properties indicate however a more complicated picture in the same concentration and temperature ranges. In steady shear, the viscosity of the trehalose decanoate solutions do not exhibit any shear rate dependence from 1 to 100 s(-1) for concentrations up to 42 wt%. Below 0.8 wt%, the viscosity remains constant and close to that of water; then, between 0.8 and 23 wt%, the viscosity shows a quadratic increase with surfactant concentration. For higher concentrations, up to 42 wt%, no further significant increase in viscosity is observed. In oscillatory shear experiments, the solutions exhibit viscoelastic properties. The observed rheological behavior as a function of concentration and temperature may be due to a progressive evolution of the trehalose decanoate molecular associations: as the concentration increases, the system evolves towards an entangled and/or partially branched or cross-linked micellar network, and eventually a multiconnected network of cross-linked micelles.
DOI: 10.1016/j.jcis.2005.07.019
PubMed: 16125719
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pubmed:16125719Le document en format XML
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<term>Micelles</term>
<term>Molecular Structure</term>
<term>Phase Transition</term>
<term>Rheology</term>
<term>Shear Strength</term>
<term>Solutions (chemistry)</term>
<term>Surface Properties</term>
<term>Surface-Active Agents (chemistry)</term>
<term>Temperature</term>
<term>Trehalose (metabolism)</term>
<term>Viscosity</term>
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<keywords scheme="KwdFr" xml:lang="fr"><term>Décanoate (synthèse chimique)</term>
<term>Eau ()</term>
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<term>Réactifs réticulants ()</term>
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<term>Solutions ()</term>
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<term>Température</term>
<term>Tensioactifs ()</term>
<term>Transition de phase</term>
<term>Tréhalose (métabolisme)</term>
<term>Viscosité</term>
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<term>Solutions</term>
<term>Structure moléculaire</term>
<term>Température</term>
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<term>Transition de phase</term>
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<front><div type="abstract" xml:lang="en">Surface tension properties of an enzymatically synthesized equimolar mixture of trehalose mono- and didecanoate in aqueous solutions have been determined. At 20 degrees C a critical micellar concentration (CMC) of 50 micromol/l and a minimal surface tension of 28 mN/m have been obtained. Above the CMC, it has been shown that up to a concentration of 42 wt%, and in a 20-60 degrees C temperature range the sugar ester aqueous solutions do not form any crystalline structure, nor present any phase transition, and the trehalose decanoate molecules form an isotropic worm-like micellar phase. The rheological properties indicate however a more complicated picture in the same concentration and temperature ranges. In steady shear, the viscosity of the trehalose decanoate solutions do not exhibit any shear rate dependence from 1 to 100 s(-1) for concentrations up to 42 wt%. Below 0.8 wt%, the viscosity remains constant and close to that of water; then, between 0.8 and 23 wt%, the viscosity shows a quadratic increase with surfactant concentration. For higher concentrations, up to 42 wt%, no further significant increase in viscosity is observed. In oscillatory shear experiments, the solutions exhibit viscoelastic properties. The observed rheological behavior as a function of concentration and temperature may be due to a progressive evolution of the trehalose decanoate molecular associations: as the concentration increases, the system evolves towards an entangled and/or partially branched or cross-linked micellar network, and eventually a multiconnected network of cross-linked micelles.</div>
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<Abstract><AbstractText>Surface tension properties of an enzymatically synthesized equimolar mixture of trehalose mono- and didecanoate in aqueous solutions have been determined. At 20 degrees C a critical micellar concentration (CMC) of 50 micromol/l and a minimal surface tension of 28 mN/m have been obtained. Above the CMC, it has been shown that up to a concentration of 42 wt%, and in a 20-60 degrees C temperature range the sugar ester aqueous solutions do not form any crystalline structure, nor present any phase transition, and the trehalose decanoate molecules form an isotropic worm-like micellar phase. The rheological properties indicate however a more complicated picture in the same concentration and temperature ranges. In steady shear, the viscosity of the trehalose decanoate solutions do not exhibit any shear rate dependence from 1 to 100 s(-1) for concentrations up to 42 wt%. Below 0.8 wt%, the viscosity remains constant and close to that of water; then, between 0.8 and 23 wt%, the viscosity shows a quadratic increase with surfactant concentration. For higher concentrations, up to 42 wt%, no further significant increase in viscosity is observed. In oscillatory shear experiments, the solutions exhibit viscoelastic properties. The observed rheological behavior as a function of concentration and temperature may be due to a progressive evolution of the trehalose decanoate molecular associations: as the concentration increases, the system evolves towards an entangled and/or partially branched or cross-linked micellar network, and eventually a multiconnected network of cross-linked micelles.</AbstractText>
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