The Influence of Concentration and Temperature on the Formation of ¿-Oryzanol + ß-Sitosterol Tubules in Edible Oil Organogels

The gelation process of mixtures of ¿-oryzanol and sitosterol structurants in sunflower oil was studied using light scattering, rheology, and micro-scanning calorimetry (Micro-DSC). The relation between temperature and the critical aggregation concentration (CAC) of tubule formation of ¿-oryzanol and sitosterol was determined using these techniques. The temperature dependence of the CAC was used to estimate the binding energy and enthalpic and entropic contribution to the tubular formation process. The binding energy calculated at the corresponding temperatures and CACs were relatively low, in order of 2 RT (4.5 kJ mol-1), which is in accord with the reversibility of the tubular formation process. The formation of the tubules was associated with negative (exothermic) enthalpy change (¿H 0 ) compared with positive entropy term (-T ¿S 0 >0), indicating that the aggregation into tubules is an enthalpy-driven process. The oryzanol–sitosterol ratio affected the aggregation process; solutions with ratio of (60 oryzanol–40 sitosterol) started aggregation at higher temperature compared with other ratios

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Main Authors: Sawalha, H.I.M., Venema, P., Bot, A., Flöter, E., van der Linden, E.
Format: Article/Letter to editor biblioteca
Language:English
Subjects:beta-sitosterol, edible oil organogels, mixtures,
Online Access:https://research.wur.nl/en/publications/the-influence-of-concentration-and-temperature-on-the-formation-o
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spelling dig-wur-nl-wurpubs-3933422025-01-21 Sawalha, H.I.M. Venema, P. Bot, A. Flöter, E. van der Linden, E. Article/Letter to editor Food Biophysics 6 (2011) 1 ISSN: 1557-1858 The Influence of Concentration and Temperature on the Formation of ¿-Oryzanol + ß-Sitosterol Tubules in Edible Oil Organogels 2011 The gelation process of mixtures of ¿-oryzanol and sitosterol structurants in sunflower oil was studied using light scattering, rheology, and micro-scanning calorimetry (Micro-DSC). The relation between temperature and the critical aggregation concentration (CAC) of tubule formation of ¿-oryzanol and sitosterol was determined using these techniques. The temperature dependence of the CAC was used to estimate the binding energy and enthalpic and entropic contribution to the tubular formation process. The binding energy calculated at the corresponding temperatures and CACs were relatively low, in order of 2 RT (4.5 kJ mol-1), which is in accord with the reversibility of the tubular formation process. The formation of the tubules was associated with negative (exothermic) enthalpy change (¿H 0 ) compared with positive entropy term (-T ¿S 0 >0), indicating that the aggregation into tubules is an enthalpy-driven process. The oryzanol–sitosterol ratio affected the aggregation process; solutions with ratio of (60 oryzanol–40 sitosterol) started aggregation at higher temperature compared with other ratios en application/pdf https://research.wur.nl/en/publications/the-influence-of-concentration-and-temperature-on-the-formation-o 10.1007/s11483-010-9169-9 https://edepot.wur.nl/143400 beta-sitosterol edible oil organogels mixtures Wageningen University & Research
institution WUR NL
collection DSpace
country Países bajos
countrycode NL
component Bibliográfico
access En linea
databasecode dig-wur-nl
tag biblioteca
region Europa del Oeste
libraryname WUR Library Netherlands
language English
topic beta-sitosterol
edible oil organogels
mixtures
beta-sitosterol
edible oil organogels
mixtures
spellingShingle beta-sitosterol
edible oil organogels
mixtures
beta-sitosterol
edible oil organogels
mixtures
Sawalha, H.I.M.
Venema, P.
Bot, A.
Flöter, E.
van der Linden, E.
The Influence of Concentration and Temperature on the Formation of ¿-Oryzanol + ß-Sitosterol Tubules in Edible Oil Organogels
description The gelation process of mixtures of ¿-oryzanol and sitosterol structurants in sunflower oil was studied using light scattering, rheology, and micro-scanning calorimetry (Micro-DSC). The relation between temperature and the critical aggregation concentration (CAC) of tubule formation of ¿-oryzanol and sitosterol was determined using these techniques. The temperature dependence of the CAC was used to estimate the binding energy and enthalpic and entropic contribution to the tubular formation process. The binding energy calculated at the corresponding temperatures and CACs were relatively low, in order of 2 RT (4.5 kJ mol-1), which is in accord with the reversibility of the tubular formation process. The formation of the tubules was associated with negative (exothermic) enthalpy change (¿H 0 ) compared with positive entropy term (-T ¿S 0 >0), indicating that the aggregation into tubules is an enthalpy-driven process. The oryzanol–sitosterol ratio affected the aggregation process; solutions with ratio of (60 oryzanol–40 sitosterol) started aggregation at higher temperature compared with other ratios
format Article/Letter to editor
topic_facet beta-sitosterol
edible oil organogels
mixtures
author Sawalha, H.I.M.
Venema, P.
Bot, A.
Flöter, E.
van der Linden, E.
author_facet Sawalha, H.I.M.
Venema, P.
Bot, A.
Flöter, E.
van der Linden, E.
author_sort Sawalha, H.I.M.
title The Influence of Concentration and Temperature on the Formation of ¿-Oryzanol + ß-Sitosterol Tubules in Edible Oil Organogels
title_short The Influence of Concentration and Temperature on the Formation of ¿-Oryzanol + ß-Sitosterol Tubules in Edible Oil Organogels
title_full The Influence of Concentration and Temperature on the Formation of ¿-Oryzanol + ß-Sitosterol Tubules in Edible Oil Organogels
title_fullStr The Influence of Concentration and Temperature on the Formation of ¿-Oryzanol + ß-Sitosterol Tubules in Edible Oil Organogels
title_full_unstemmed The Influence of Concentration and Temperature on the Formation of ¿-Oryzanol + ß-Sitosterol Tubules in Edible Oil Organogels
title_sort influence of concentration and temperature on the formation of ¿-oryzanol + ß-sitosterol tubules in edible oil organogels
url https://research.wur.nl/en/publications/the-influence-of-concentration-and-temperature-on-the-formation-o
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