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Sequential crystallization of high and low melting waxes to improve oil structuring in wax-based oleogels

Iris Tavernier UGent, Diem Chi Doan, Davy Van de Walle UGent, Sabine Danthine, Tom Rimaux and Koen Dewettinck UGent (2017) RSC ADVANCES. 7(20). p.12113-12125
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.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
RICE BRAN OIL, FAT CRYSTAL NETWORKS, NATURAL WAXES, BINARY BLENDS, MECHANICAL-PROPERTIES, PHASE-BEHAVIOR, SUNFLOWER WAX, MILK-FAT, ORGANOGELS, ACIDS
journal title
RSC ADVANCES
RSC Adv.
volume
7
issue
20
pages
12113 - 12125
Web of Science type
Article
Web of Science id
000395873500036
ISSN
2046-2069
DOI
10.1039/c6ra27650d
language
English
UGent publication?
yes
classification
A1
additional info
the first two authors contributed equally to this work
copyright statement
I have transferred the copyright for this publication to the publisher
id
8510588
handle
http://hdl.handle.net/1854/LU-8510588
date created
2017-02-21 11:14:24
date last changed
2017-07-25 14:27:19
@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},
  keyword      = {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://dx.doi.org/10.1039/c6ra27650d},
  volume       = {7},
  year         = {2017},
}

Chicago
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.
APA
Tavernier, Iris, 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.
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.
MLA
Tavernier, Iris, Diem Chi Doan, Davy Van de Walle, et al. “Sequential Crystallization of High and Low Melting Waxes to Improve Oil Structuring in Wax-based Oleogels.” RSC ADVANCES 7.20 (2017): 12113–12125. Print.