Pellegrino Luca, Tyagi Gunjan, Robles Eric S J, Cabral João T
Department of Chemical Engineering, Imperial College London, London, UK.
Procter & Gamble, Newcastle Innovation Centre, Newcastle upon Tyne, UK.
Phys Chem Chem Phys. 2022 Dec 14;24(48):29413-29422. doi: 10.1039/d2cp02395d.
We investigate the phase behavior of model ternary triacylglycerol blends, comprising triolein (CHO, OOO), tripalmitin (CHO, PPP) and tristearin (CHO, SSS), building upon extensive characterisation of single and binary mixtures, in order to rigorously map the thermal transitions of model natural 'fats'. A combination of calorimetry, X-ray diffraction, and FTIR spectroscopy is employed to determine crystallisation and melting temperatures and identify the corresponding phases in the complex ternary system. We recover the eutectic behaviour of SSS-PPP blends and the invariability of OOO neat transitions, and resolve the complex β' + β ternary surface, reflecting the roles of unsaturation and polymorphism of its constituents. Our results provide a representation of the OOO:PPP:SSS:temperature phase behaviour into a triangular prism, consistent with binary pair-wise data, which can inform a range of food science, cosmetic, pharmaceutical and cleaning applications that depend strongly on the physical-chemistry of such multicomponent 'triglycerides'.
我们基于对单一和二元混合物的广泛表征，研究了由三油精（CHO，OOO）、三棕榈精（CHO，PPP）和三硬脂精（CHO，SSS）组成的三元甘油三酯混合物的相行为，以便精确绘制模型天然“脂肪”的热转变图谱。采用量热法、X射线衍射和傅里叶变换红外光谱相结合的方法来确定结晶温度和熔化温度，并识别复杂三元体系中的相应相。我们重现了SSS-PPP混合物的共晶行为以及纯OOO转变的不变性，并解析了复杂的β'+β三元表面，这反映了其成分的不饱和度和多晶型性的作用。我们的结果将OOO:PPP:SSS:温度相行为表示在一个三棱柱中，与二元成对数据一致，可为一系列严重依赖此类多组分“甘油三酯”物理化学性质的食品科学、化妆品、制药和清洁应用提供参考。
