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| 基于棕榈油软脂的甘油二酯油结晶特性研究 |
| Crystallization behaviors of diacylglycerol oil based on palm olein |
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| DOI： |
| 中文关键词: 甘油二酯油 结晶特性 棕榈油软脂 |
| 英文关键词:diacylglycerol oil crystallization behavior palm olein |
| 基金项目: |
| Author Name | Affiliation | | SONG Jia1,2, LIU Zun1,2, YANG Xue1,2, TENG Yinglai1,2,LI Aijun1,2, WANG Yong | |
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| 中文摘要: |
| 采用Lipozyme 435脂肪酶催化棕榈油软脂与甘油进行酯交换反应制得两种不同甘油二酯含量（62.7%与82.6%）的甘油二酯油。通过差示扫描量热仪、X射线衍射仪等表征了两种产品的熔化结晶特性和晶型等物理特性，并通过Avrami方程对其等温结晶动力学进行了研究。结果表明：脂肪酸组成相似而纯度不同的甘油二酯油，纯度高的甘油二酯油的熔点、结晶起始点均高于纯度低的甘油二酯油。非等温结晶中，两者表现出相似的热力学性质。等温结晶中，两者成核方式均为异相成核，但存在两种晶体生长机制。此外，高纯度的甘油二酯油较低纯度的甘油二酯油含有更多的β′晶型，形成的结晶网络更加细腻。 |
| 英文摘要: |
| Two kinds of diacylglycerol oils with different diacylglycerol contents(62.7% and 82.6%) were prepared through transesterification from palm olein and glycerol catalyzed by Lipozyme 435. The physical characteristics such as melting crystallization properties and crystallines of two kinds of diacylglycerol oils were characterized by differential scanning calorimetry and X ray diffraction. Then, isothermal crystallization kinetics was studied by the Avrami equation. The results showed that for diacylglycerol oils with similar fatty acid composition and different purities, the diacylglycerol oil with higher purity had higher melting point and initial crystallization temperature. In non-isothermal crystallization, the diacylglycerol oils were similar in thermodynamic properties. In isothermal crystallization, the nucleation mode of diacylglycerol oils was heterogeneous, but there were two kinds of crystal growth mechanism. In comparison, the diacylglycerol oil with higher content of DAG had more β′ crystals and the network formed was smoother. |
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