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| Effects of ratio of stearyl alcohol to rice bran wax on the microstructure and crystallization behavior of sunflower seed oil oleogels |
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| KeyWord:oleogels stearyl alcohol rice bran wax microstructure crystallization behavior |
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| Abstract: |
| In order to investigate the interaction mechanism of stearyl alcohol (SA) and rice bran wax (RW) in oleogels, sunflower seed oil oleogels were prepared by the mixture of SA and RW with various ratios as gelators. The effects of the ratio of RW to SA on the thermal properties, microstructure and morphology, and crystallization behavior of these oleogels were investigated by differential scanning calorimeter (DSC), low field nuclear magnetic resonance and polarizing microscope (PLM). The results showed that the solid fat contents(SFC) of different oleogels showed two-step decrease with temperature increasing. As the content of SA increased, RW and SA melted and crystalized sequentially. The cocrystal behavior appeared in the crystallization of the binary oleogels. The crystal morphology of RW oleogel was needle-like or rod-like structure, that of SA oleogel was plate-like. With decrease of the ratio of RW to SA, the morphology of the oleogels changed from the aggregates of needle-like or rod-like crystal to aggregates of needle-like crystals entrapped with small plate crystals, to aggregates of large plate crystals entrapped with small needle-like crystals. The oleogels formed by the gelators with the mass ratio of SA to RW 1∶9, 3∶7, 5∶5 and 7∶3 presented two-step crystallization, others showed one-step crystallization at 20℃. The oleogels formed by the gelators with the mass ratio of SA to RW 7∶3 showed two-step crystallization, and the others indicated one-step crystallization at 30℃. In conclusion, the influence of different ratios of SA to RW in oleogels showes variety of SFC melting process, thermal properties differences, variety of crystal morphology and different crystallization behavior, which are caused by the interaction of SA and RW crystals particles in the microstructure. |
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