Ternary phase behavior of milk fat fractions
1998
Marangoni, A.G. | Lencki, R.W.
Milk fat was sequentially crystallized from ethyl acetate into three major components-a high melting fraction (HMF), a middle melting fraction (MMF), and a low melting fraction (LMF)-in 12%, 34%, and 54% (w/w) yields, respectively. The phase behavior of mixtures of HMF, MMF, and LMF was studied using solid fat content vs temperature data. Binary and ternary phase diagrams of mixtures of the three components were constructed. Binary HMF-MMF mixtures displayed monotectic solution behavior, forming a solid solution, whereas both LMF-HMF and LMF-MMF binaries formed partial solid solutions. The LMF fraction interacted more strongly with MMF than with HMF. Ternary phase diagrams showed the complex interaction between the three components simultaneously. On average, monotectic solution behavior was observed in mixtures of the three fractions at temperatures between 0 and 15 degrees C and above 30 degrees C. A eutectic was observed between a MMF-HMF solid solution and LMF at 0 degrees C. At temperatures corresponding to the melting range of MMF (15 degrees C < T < 30 degrees C), complex solution behavior was observed, with strong interactions between MMF and LMF.
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