L-抗坏血酸棕榈酸酯对椰子油结晶行为的影响

Effect of L-ascorbyl palmitate on the crystallization behavior of coconut oil

以椰子油作为模型,利用结晶动力学方程、X-射线衍射(XRD)分析、热力学分析以及偏振光显微镜(PLM)观察等方法研究了L-抗坏血酸棕榈酸酯(L-AP)对椰子油结晶行为的影响。结果表明:L-AP提高了椰子油的结晶速率,改变了晶体成核和生长机制;L-AP以"晶种"的方式诱导椰子油的结晶,对其结晶过程产生了促进作用;L-AP没有改变椰子油晶体的晶型以及堆积方式,却增加了晶体纳米片层的厚度;随着L-AP添加量的增加,晶体结构更加致密有序。

Coconut oil was used as a model, and the effect of L-ascorbyl(L-AP) on the crystallization behavior of coconut oil was studied by crystallization kinetics equation, X-ray diffraction(XRD), thermodynamic analysis and polarized light microscopy(PLM). The results showed that L-AP increased the crystallization rate of coconut oil and changed the mechanism of nucleation and growth. Moreover, L-AP induced the crystallization as a "seed effect" and promoted the crystallization process of coconut oil. No significant changes were found in the crystal packing mode and crystal form with the addition of L-AP. However, L-AP increased the thickness of the crystal nanosheets. Furthermore, coconut oil presented more ordered the crystal structure as the increase of the dosage of L-AP.