Phosphatidylcholine/vegetable oil pseudo-binary mixtures at the air-water interface: Predictive formulation of oil blends with selected surface behavior

作者：Caruso Benjamin; Maestri Damian M; Perillo Maria A^*

来源：Colloids and Surfaces B: Biointerfaces , 2010, 75(1): 57-66.

DOI：10.1016/j.colsurfb.2009.08.014

• Phosphatidylcholine
• Vegetable oils
• Monolayers
• Surface parameters
• Chemical composition

The present work is an attempt to define how to formulate oil blends with an expected surface behavior using easily accessible data such as chemical compositions Hence, we determined average surface properties of triglycerides (TG) from olive (0). soybean (S), and walnut (W) oils self-organized in Langmuir films alone or in pseudo-binary mixtures with phosphatidylcholines (PC)
Collapse pressure (pi(c)), compressibility modulus (K) and molecular area at the closest packing (A(min)) were determined from pi-mean molecular area (Mma) isotherms The pi(c)-composition phase diagrams of TG-PC mixtures provided information about oils solubility limit with PCs in the monolayer phase. A thermodynamic equilibrium model was fitted to the line Joining points of monolayer-TG(liquid phase) coexistence and allowed to obtain interaction parameters, omega. which consistently with those of excess sui face energy (Delta G(ex)) and Mma deviations from ideality, contributed to describe Interfacial intermolecular interactions Oil molar fractions (x(TG)) for TGs-PCs self-assembling into vesicles were estimated from x(TG), values at pi(c) congruent to 30 mN/m (equilibrium pi of bilayers), which resulted higher in egg PC (0 15, 0 2, 0 15 for O, S and W, respectively) than in dipalmitoyl-PC (0 125, 0 075, 0 1).
Principal component analysis performed on SW face parameters. grouped S and W separated from 0 This result was mainly influenced by variab

• 出版日期2010-1-1