Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 436394
Title The influence of the type of oil phase on the self-assembly process of ¿-oryzanol + ß-sitosterol tubules in organogel systems
Author(s) Sawalha, H.I.M.; Margry, G.; Adel, R. den; Venema, P.; Bot, A.; Flöter, E.; Linden, E. van der
Source European Journal of Lipid Science and Technology 115 (2013)3. - ISSN 1438-7697 - p. 295 - 300.
Department(s) Physics and Physical Chemistry of Foods
Publication type Refereed Article in a scientific journal
Publication year 2013
Keyword(s) edible oils - emulsions - mixtures
Abstract Mixtures of ¿-oryzanol and ß-sitosterol were used to structure different oils (decane, limonene, sunflower oil, castor oil and eugenol). The ¿-oryzanol and ß-sitosterol mixtures self-assemble into double-walled hollow tubules (~10 nm in diameter) in the oil phase, which aggregate to form a network resulting in firm organogels. The self-assembly of the sterol molecules into tubules was studied using light scattering and rheology. By using different oils, the influence of the polarity of the oil on the self-assembly was studied. The effects of temperature and structurant concentration on the tubular formation process were determined and the thermodynamic theory of self-assembly was applied to calculate the change in Gibbs free energy ( DG0), enthalpy (DH0) and entropy ( DS0) resulting from the aggregation of the structurants was determined. The self-assembly was found to be enthalpy-driven as characterized by a negative DH0 and DS0. A decreasing polarity of the oil promotes the self-assembly leading to formation of tubules at higher temperatures and lower structurants concentrations.
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