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Biophysical studies of pulmonary surfactant, PS, provide the possibility to assess the roles of physicochemical phenomena in physiological functions of this mixture of biosurfactants lining the surface of lung’s alveoli. In particular they help to understand the possible alterations of PS functions by inhaled compounds (aerosols or gases). Most experimental studies are based on either multicomponent...
Effect of a model bovine milk protein, β-casein, on surface activity of Quillaja bark saponin (QBS) from Sigma was studied at three fluid/fluid interfaces: air/water, tetradecane/water and olive oil/water. In all cases, the protein concentration was fixed at 10 −6 mol L −1 , and QBS concentration was varied between 5·10 −7 and 1·10 −3 mol L −1 . Dynamic interfacial...
The short- and mid-term adsorption kinetics of Quillaja Bark Saponin (QBS) biosurfactant at water–air interface was studied using a maximum bubble pressure and drop shape analysis techniques, respectively. The low values of diffusion coefficients at initial and close-to equilibrium stages of adsorption suggest that adsorption of QBS is mixed-diffusion barrier controlled. Increasing the ionic strength...
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