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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Language: | English |
Subjects: | beta-sitosterol, edible oil organogels, mixtures, |
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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 |
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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 |
work_keys_str_mv |
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