Equilibrium and dynamics of adsorption of mixed β-casein/surfactant solutions at the water/hexane interface

Equilibrium and Dynamic Interfacial Properties of Protein/Ionic-Liquid-Type Surfactant Solutions at the Decane/Water Interface

“…For lysozyme/[C 16 mim]Br mixed solutions, a noticeable acceleration in the decrease in the interfacial tension to reach values close to the equilibrium is observed at all [C 16 mim]Br concentrations. At longer times, the behavior of the two systems is substantially different, signifying important structural differences between them.…”

“…The kinetic dependencies of the interfacial tension shown in Figure 2 suggest that the interfacial properties of the protein solutions start to change strongly at [C 16 mim]Br concentrations lower than 1 × 10 −8 mol/L. In particular, the presence and absence of an induction period for β-casein/[C 16 β-Casein has no tertiary structure, is disordered and flexible, and is a random coil protein with only 1−10% of the chain in an α-helix and <25% in a β-sheet structure.…”

“…The pH values of the solutions before and after the experiments were in the range of 6.8 to 7.0. The protein/surfactant mixed solutions were prepared at constant protein concentrations (hen egg-white lysozyme at 7 × 10 −7 mol/L and β-casein at 8 × 10 −8 mol/L) and varying [C 16 mim]Br concentrations in the range of 1 × 10 −8 to 1 × 10 −5 mol/L. All solutions were prepared using Milli-Q water.…”

Tensiometry and dilational rheology of mixed β-lactoglobulin/ionic surfactant adsorption layers at water/air and water/hexane interfaces

“…The adsorption of the individual SDS and DoTAB surfactants used in this study is also affected by the type of the interface and this is discussed in details elsewhere [23][24][25][33][34][35]. Briefly, due to dispersion forces between the surfactant molecules and those of the organic phase, on one hand the surfactant exhibits greater affinity to the water/oil interface as compared to W/A surface, estimated by calculations of the adsorption constant b S [34] and the adsorption energy [33], but on the other hand the accumulation of organic molecules around the surfactant hydrophobic chains results in a higher molar area than for the case of adsorption at W/A surface [23,34].…”

“…Briefly, due to dispersion forces between the surfactant molecules and those of the organic phase, on one hand the surfactant exhibits greater affinity to the water/oil interface as compared to W/A surface, estimated by calculations of the adsorption constant b S [34] and the adsorption energy [33], but on the other hand the accumulation of organic molecules around the surfactant hydrophobic chains results in a higher molar area than for the case of adsorption at W/A surface [23,34]. However, it should be noted that at high surface coverage near the CMC the adsorptions C as well as the molar areas of DoTAB at both interfaces become similar [27].…”