Sequential crystallization of high and low melting waxes to improve oil structuring in wax-based oleogels
- Author
- Iris Tavernier, Diem Chi Doan (UGent) , Davy Van de Walle (UGent) , Sabine Danthine, Tom Rimaux and Koen Dewettinck (UGent)
- Organization
- Abstract
- The main 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.
- Keywords
- RICE BRAN OIL, FAT CRYSTAL NETWORKS, NATURAL WAXES, BINARY BLENDS, MECHANICAL-PROPERTIES, PHASE-BEHAVIOR, SUNFLOWER WAX, MILK-FAT, ORGANOGELS, ACIDS
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Citation
Please use this url to cite or link to this publication: http://hdl.handle.net/1854/LU-8510588
- MLA
- Tavernier, Iris, et al. “Sequential Crystallization of High and Low Melting Waxes to Improve Oil Structuring in Wax-Based Oleogels.” RSC ADVANCES, vol. 7, no. 20, 2017, pp. 12113–25, doi:10.1039/c6ra27650d.
- APA
- Tavernier, I., Doan, D. C., Van de Walle, D., Danthine, S., Rimaux, T., & Dewettinck, K. (2017). Sequential crystallization of high and low melting waxes to improve oil structuring in wax-based oleogels. RSC ADVANCES, 7(20), 12113–12125. https://doi.org/10.1039/c6ra27650d
- Chicago author-date
- Tavernier, Iris, Diem Chi Doan, Davy Van de Walle, Sabine Danthine, Tom Rimaux, and Koen Dewettinck. 2017. “Sequential Crystallization of High and Low Melting Waxes to Improve Oil Structuring in Wax-Based Oleogels.” RSC ADVANCES 7 (20): 12113–25. https://doi.org/10.1039/c6ra27650d.
- Chicago author-date (all authors)
- Tavernier, Iris, Diem Chi Doan, Davy Van de Walle, Sabine Danthine, Tom Rimaux, and Koen Dewettinck. 2017. “Sequential Crystallization of High and Low Melting Waxes to Improve Oil Structuring in Wax-Based Oleogels.” RSC ADVANCES 7 (20): 12113–12125. doi:10.1039/c6ra27650d.
- Vancouver
- 1.Tavernier I, Doan DC, Van de Walle D, Danthine S, Rimaux T, Dewettinck K. Sequential crystallization of high and low melting waxes to improve oil structuring in wax-based oleogels. RSC ADVANCES. 2017;7(20):12113–25.
- IEEE
- [1]I. Tavernier, D. C. Doan, D. Van de Walle, S. Danthine, T. Rimaux, and K. Dewettinck, “Sequential crystallization of high and low melting waxes to improve oil structuring in wax-based oleogels,” RSC ADVANCES, vol. 7, no. 20, pp. 12113–12125, 2017.
@article{8510588, abstract = {{The main 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.}}, author = {{Tavernier, Iris and Doan, Diem Chi and Van de Walle, Davy and Danthine, Sabine and Rimaux, Tom and Dewettinck, Koen}}, issn = {{2046-2069}}, journal = {{RSC ADVANCES}}, keywords = {{RICE BRAN OIL,FAT CRYSTAL NETWORKS,NATURAL WAXES,BINARY BLENDS,MECHANICAL-PROPERTIES,PHASE-BEHAVIOR,SUNFLOWER WAX,MILK-FAT,ORGANOGELS,ACIDS}}, language = {{eng}}, number = {{20}}, pages = {{12113--12125}}, title = {{Sequential crystallization of high and low melting waxes to improve oil structuring in wax-based oleogels}}, url = {{http://doi.org/10.1039/c6ra27650d}}, volume = {{7}}, year = {{2017}}, }
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