小烛树蜡和日本木蜡对高油酸葵花籽油 凝胶油结晶行为的差异比较Comparison of candelilla wax and Japan lacquer wax on crystalline behavior of high-oleic sunflower seed oil oleogels

Abstract

将小烛树蜡和日本木蜡分别添加到高油酸葵花籽油中制备凝胶油，分析其在凝胶油形成过程中结晶行为的差异。结果表明：在添加量为5%时，两种蜡均表现出低频率依赖的“强凝胶”行为，小烛树蜡具有更强的热稳定性和表观黏度，日本木蜡则具有更高的触变回复性；热力学性质进一步证实凝胶油性能的差异与天然蜡的成分有关。在微观层面上，小烛树蜡凝胶油和日本木蜡凝胶油分别呈现簇状和针状的晶体形态；小烛树蜡晶型为β′型，而日本木蜡则在形成凝胶油的过程中发生晶体排列堆积方式的改变，晶型由β′型转为β型。日本木蜡具有与高熔点蜡不同的特殊结晶性质，在塑性脂肪开发中具有潜在应用价值。 Candelilla wax(CLW) and Japan lacquer wax(RLW) were added into high-oleic sunflower seed oil to prepare oleogels, and the difference in crystalline behavior during the formation of oleogels was analyzed. The results showed that both the waxes exhibited stable oleogels with low frequency dependence at the dosage of 5%. Candelilla wax had stronger thermal stability and apparent viscosity, while Japan lacquer wax had higher thixotropic recovery. Thermal properties further comfirmed that the difference of oleogels capacity was related to the composition of waxes. At the microscopic level, candelilla wax oleogels and Japan lacquer wax oleogels presented cluster and needle-like crystal morphologies, respectively. The crystal polymorph of candelilla wax was β′, while the crystal arrangement of Japan lacquer wax changed in the process of forming oleogel, and its crystal polymorph turned from β′ to β. Japan lacquer wax had special crystalline properties different from other high-melting point waxes, and had potential application value in the development of plastic fat replacement.

Keywords

• 日本木蜡；小烛树蜡；凝胶油；结晶网络；微观形态
• japan lacquer wax; candelilla wax; oleogel; crystal network; micromorphology