Premium
Thermo‐mechanical properties of candelilla wax and dotriacontane organogels in safflower oil
Author(s) -
MoralesRueda Juan A.,
DibildoxAlvarado Elena,
CharóAlonso Miriam A.,
Weiss Richard G.,
ToroVazquez Jorge F.
Publication year - 2009
Publication title -
european journal of lipid science and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.614
H-Index - 94
eISSN - 1438-9312
pISSN - 1438-7697
DOI - 10.1002/ejlt.200810174
Subject(s) - wax , alkane , materials science , rheology , phase (matter) , chemical engineering , triolein , solubility , chemistry , organic chemistry , composite material , hydrocarbon , lipase , engineering , enzyme
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 (C 32 ). 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 ( T set ). Based on comparisons of the organogels made with C 32 , 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 T set , C 32 showed a higher solubility and higher self‐assembly capability in the SFO than CW. Nevertheless, for the same gelator concentration and time‐temperature conditions, C 32 organogels had lower G' profiles than CW organogels. Additionally, independent of the type of gelator, more stable organogel structures were developed at T set = 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 T set . The results here obtained showed that it is possible to gelate SFO through organogelation with CW and without the use of trans fats.