[en] Themain objective of this study was to investigate the effect of combining a high-melting wax (sunflower wax or rice bran wax)with a low-melting wax (berrywax or BEW) on the crystallization and gelation behavior of the corresponding wax-based oleogels in rice bran oil (RBO). Sunflower wax (SW) and rice bran wax (RBW) have a similar chemical composition but a very different crystallization behavior. Therefore, SWand RBW were also combined in a wax-based oleogel to examine the occurrence of co-crystallization and/or crystal coexistence.
The thermal and gelation behavior of the binary blends in rice bran oil (5% w/w total
concentration of wax) were investigated with differential scanning calorimetry (DSC) and rheological
measurements, showing sequential crystallization and gelation for the SW/RBW : BEW wax-based oleogels and simultaneous crystallization and gelation for the SW : RBW wax-based oleogels. Oscillatory shear and hardness measurements revealed the reinforcement of the high-melting wax crystal network with the addition of the low-melting berry wax. X-ray diffraction (XRD) measurements in both the long-spacing and the short-spacing region showed the occurrence of crystal co-existence, rather than co-crystallization, which was confirmed with polarized light microscopy (PLM). Two different crystal morphologies could be discerned for all three combinations (RBW : SW, SW : BEW and RBW : BEW). We hypothesized that the improved rheological properties could be attributed to sintering, a process in which the low-melting BEW crystals form solid bonds between the crystals of the high-melting waxes. As such, a cohesive network is formed, resulting in an increased hardness of the bi-wax-based oleogels. This research provides the opportunity to minimize the amount of wax necessary in creating semi-solid materials with a wide variety in rheological and textural properties.
Disciplines :
Food science
Author, co-author :
Tavernier, Iris
Doan, Chi Diem
Van de Walle, Davy
Danthine, Sabine ; Université de Liège > Agronomie, Bio-ingénierie et Chimie (AgroBioChem) > Science des alim. et formul.
Rimaux, Tom
Dewettinck, Koen
Language :
English
Title :
Sequential crystallization of high and low melting waxes to improve oil structuring in wax-based oleogels
Publication date :
2017
Journal title :
RSC Advances
eISSN :
2046-2069
Publisher :
Royal Society of Chemistry Publishing, Cambridge, United Kingdom
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