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- W2051294007 abstract "The surface pressure (pi)-area (A) isotherms and Brewster angle microscopy (BAM) images of beta-casein-dioleoyl phosphatidylcholine (DOPC) mixed films spread on buffered water at pH 7 and 9 and at 20 degrees C were determined as a function of the mass fraction of DOPC in the mixture (X(DOPC)). The structural characteristics, miscibility, and topography (morphology and reflectivity) of DOPC-beta-casein mixed films were very dependent on surface pressure and monolayer composition. The structure in DOPC-beta-casein mixed monolayers was liquid-expanded-like, as for pure components. The monolayer structure was more expanded as the pH and the DOPC concentration in the mixture were increased. From the concentration and surface pressure dependence on excess area and elasticity (E) it was deduced that DOPC and beta-casein form a practically immiscible monolayer at the air-water interface. The BAM images and the evolution with the surface pressure of the reflectivity of BAM images give complementary information on the interactions and structural characteristics of DOPC-beta-casein mixed monolayers, which corroborate the conclusions derived from the pi-A isotherm. After the spreading or just after the expansion at pi approximately 0 we have observed the presence of 2D-foams, typical topography of DOPC monolayers at low pi. The 2D-foams disappear after the compression of the monolayer and the topography is homogenous and isotropic. From the reflectivity of BAM images it is possible to distinguish between the coexistence of DOPC and beta-casein or beta-casein displacement by DOPC, depending on the surface pressure. The surface dilatational properties of the mixed films corroborate the coexistence of DOPC and beta-casein at pi lower than the equilibrium spreading pressure (pi(e)) of beta-casein and beta-casein displacement by DOPC at pi>pi(e) of beta-casein. The phenomena observed appear to be generic for protein and polar (monoglycerides) and ionizable (phospholipid) mixed monolayers." @default.
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- W2051294007 date "2009-02-01" @default.
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- W2051294007 title "Structural, topographical, and rheological characteristics of β-casein–dioleoyl phosphatidylcholine (DOPC) mixed monolayers" @default.
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- W2051294007 doi "https://doi.org/10.1016/j.colsurfb.2008.10.010" @default.
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