Surface chemical properties of biopolymers determined by contact angle measurements

Summary The surface chemical properties of various biopolymer solids, e.g. fibrinogen, BSA, Lysozyme and denatured BSA, were studied by measuring the contact angles of the liquid-solid interface. The magnitude of the solid surface tension, _S^D, determined from Fowkes' relations for the various biopolymers was found to be 37.0 dyne/cm. These results show that the dispersion force component of s is of the same order of magnitude for proteins with different polarapolar character. The films of denatured BSA also show that the dispersion force component ofys does not change on denaturation, even though the polarapolar character of the protein changes on denaturation.With 6 figures and 1 table