A method is proposed for the relatively simple and rapid separation of amphipathic biopolymers, based on adsorption onto and desorption from the surface of hexadecane droplets. Adsorption to the hexadecane:water interface was carried out by mixing hexadecane with aqueous protein solutions at room temperature. Desorption was performed by consecutive solidification and melting of the liquid hydrocarbon (m.p. 18° C), resulting in coalescence of the droplets and reappearance of the desorbed moiety in the bulk aqueous phase. Of interest was the observation that lysozyme remains enzymatically active following this procedue.