Influence of a Lipid Monolayer on Adsorption of Oat Globulin Fibrils

ABSTRACT The adsorption of a plant protein, oat globulin, and its fibrils at the liquid/air interface with and without a monolayer of an oppositely charged lipid was studied by the oscillating barrier method, ellipsometry, and atomic force microscopy. Spreading of a monolayer of dipalmitoyl phosphatidyl glycerol (DPPG) on the liquid surface decreases the electrostatic adsorption barrier, accelerating strongly the adsorption and increasing the surface concentration of fibrils. The resulting formation of a dense and thick layer of fibrils at the interface can be used for the effective stabilization of liquid dispersion systems. Thus, the complexes of lipids and fibrils of plant proteins can replace the corresponding compositions containing animal proteins in the food, pharmaceutical, and cosmetic industries.