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[Adsorption of dimethylsulfoxide on proteins].

A method for measuring the adsorption of dimethyl sulfoxide on native and denatured trypsin and albumin was developed. On native proteins, no positive adsorption was registered, and a slight negative adsorption within the limits of experimental error was observed. It was shown that the properties of denatured proteins depend on the mode and conditions of denaturation. On one of denatured trypsin specimens, positive adsorption of dimethyl sulfoxide was registered, on other specimens no adsorption was observed. The reason for this behavior lies in the hydrophobic nature of adsorption of dimethyl sulfoxide at the interface, while the surface of native protein globules and, probably, most denatured protein specimens is hydrophilic.