Thermo-mechanical properties of candelilla wax and dotriacontane organogels in safflower oil

The thermo-mechanical properties of organogels developed by a complex mixture of n-alkanes present in candelilla wax (CW) were investigated and compared with the ones of organogels developed by a pure n-alkane, dotriacontane (C₃₂). In both cases, the liquid phase used was safflower oil high in triol...

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Published in:European journal of lipid science and technology 2009-02, Vol.111 (2), p.207-215
Main Authors: Morales-Rueda, Juan A, Dibildox-Alvarado, Elena, Charó-Alonso, Miriam A, Weiss, Richard G, Toro-Vazquez, Jorge F
Format: Article
Language:English
Subjects:
Biological and medical sciences
Candelilla wax
Fat industries
Food industries
Fundamental and applied biological sciences. Psychology
Hentriacontane
Organogels
Rheology
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Summary:The thermo-mechanical properties of organogels developed by a complex mixture of n-alkanes present in candelilla wax (CW) were investigated and compared with the ones of organogels developed by a pure n-alkane, dotriacontane (C₃₂). In both cases, the liquid phase used was safflower oil high in triolein (SFO) and the variables studied were two levels of gelator concentration (1 and 3%), cooling rates of 1 and 10 °C/min, and two gel setting temperatures, 5 and 25 °C (Tset). Based on comparisons of the organogels made with C₃₂, the presence of minor molecular components in CW had a profound effect on the crystal habit of the n-alkanes in CW-based organogels, and therefore on their physical properties. Thus, independent of the cooling rate and Tset, C₃₂ showed a higher solubility and higher self-assembly capability in the SFO than CW. Nevertheless, for the same gelator concentration and time-temperature conditions, C₃₂ organogels had lower G' profiles than CW organogels. Additionally, independent of the type of gelator, more stable organogel structures were developed at Tset = 5 °C and using the lower cooling rate. The rheological behavior of the organogels was explained considering the formation of a rotator phase by the n-alkanes, its solid-solid transition, and their dependence as a function of the cooling rate and Tset. The results here obtained showed that it is possible to gelate SFO through organogelation with CW and without the use of trans fats.
ISSN:1438-7697
1438-9312
DOI:10.1002/ejlt.200810174