Capric acid, palimitic acid, oleic acid are more than 50% of fatty acids in milk fat. Milkfat triglycerides are a significant fraction of the milk fat globular membrane (MFGM). Hence, the study of the physical properties of MFGM will be rendered useful for further improvement ofdairy products. The compressibility and excess Gibbs Energy for monolayers composed of triglyceride mixtures were investigated using the Langmuir trough film balance and fluorescence microscopy. Isotherms were collected at 298 K and 310 K. Binary and tertiarymixtures of tripalmitin (TP), tricaprin (TC) and triolein (TO) were spread as Langmuir monolayers. At 298 K, the 1:1 mixture of TC/TO and TP/TC exhibit positive and negative excess Gibbs energy, respectively, from 5 to 25 mN/m. At 310 K, both 1:1 mixtures of TP/TO and TP/TC show negative excess Gibbs energy from 2.5 to 15 mN/m. As a result, the TP/TO at 310 K and TP/TC at both temperatures demonstrate favorable mixing while the TC/TO at 298 K illustrates unfavorable mixing. The images from the fluorescence microscope show the phase behavior of the monolayer in order to get a visual representation of the phase transitions of the mixtures.

Excess Gibbs energy for monolayers composed of triglyceride mixtures

239th National Meeting (2010)

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.