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Highly water dilutable microemulsions: a structural study
Örebro University, School of Science and Technology. Institute of Biology, Medicinal Chemistry and Biotechnology, National Hellenic Research Foundation, Athens, Greece. (MTM)
Örebro University, School of Science and Technology. Institute of Biology, Medicinal Chemistry and Biotechnology, National Hellenic Research Foundation, Athens, Greece. (MTM)
Institute of Biology, Medicinal Chemistry and Biotechnology, National Hellenic Research Foundation, Athens, Greece.
(English)Manuscript (preprint) (Other academic)
Abstract [en]

Highly aqueous dilutable microemulsions based on biocompatible materials were developed and structurally investigated. Phase diagrams were constructed for systems consisting of non-ionic Tweens (20, 40 and blends of them), R-(+)-limonene, ethanol, water and propylene glycol. The obtained phase diagrams reveal the formation of fully aqueous dilutable microemulsions along certain dilution lines in the surfactant-rich region. Two phase transitions of the investigated systems were detected by conductivity measurements, from w/o to bicontinuous and to the o/w, without phase separation. Interfacial properties and the dynamic structure of the surfactant’s monolayer were studied by electron paramagnetic resonance spectroscopy. It was observed that the mobility of the spin probe and the rigidity of the membrane are affected by increasing aqueous content and by the type of surfactant. DLS measurements were performed in (o/w) microemulsions for different aqueous content, and oil droplet diameters in the range of 8.2 to 17.4 nm were observed.

Keywords [en]
biocompatible microemulsions, limonene, tweens, epr, dls, electrical conductivity
National Category
Chemical Sciences
Research subject
Chemistry
Identifiers
URN: urn:nbn:se:oru:diva-35080OAI: oai:DiVA.org:oru-35080DiVA, id: diva2:717986
Available from: 2014-05-19 Created: 2014-05-19 Last updated: 2017-10-17Bibliographically approved
In thesis
1. Biocompatible microemulsions: formulation, encapsulation of bioactive compounds and their potential applications
Open this publication in new window or tab >>Biocompatible microemulsions: formulation, encapsulation of bioactive compounds and their potential applications
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Örebro: Örebro universitet, 2014. p. 82
Series
Örebro Studies in Chemistry, ISSN 1651-4270 ; 14
Keywords
biocompatible microemulsions, encapsulation, pharmaceuticals, methylxanthine, agrochemicals, pyrethrinsfood, squalene, octyl gallate, gallic acid, EPR, DLS, SAXS
National Category
Chemical Sciences
Research subject
Chemistry
Identifiers
urn:nbn:se:oru:diva-35059 (URN)978-91-7529-029-4 (ISBN)
Public defence
2014-06-09, Hörsalen, Musikhögskolan, Örebro universitet, Fakultetsgatan 1, 702 81, 09:00 (English)
Opponent
Supervisors
Available from: 2014-05-15 Created: 2014-05-15 Last updated: 2017-10-17Bibliographically approved

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