The present study focuses on obtaining a generalized concentration dependence of the self-diffusion coefficient for trypsin and α-chymotrypsin as representatives of globular spheroidal proteins and for fibrinogen as an example of irregular-shaped protein. Diffusion experiments were performed by nuclear magnetic resonance (NMR) using a pulsed magnetic field gradient (PFG). The resulting generalized concentration dependence of the self-diffusion coefficient of proteins was analyzed within the framework of known theoretical approach - phenomenological approach based on the frictional formalism of non-equilibrium thermodynamics. We showed the possibility of using the phenomenological approach to describe the mobility of proteins of various shapes and sizes over a wide range of concentrations. The dynamic parameters of the system were determined: friction coefficients between protein molecules and friction coefficients between protein and solvent molecules. A qualitative explanation of the obtained values is proposed.
YaMR, diffuziya, belki, koncentracionnaya zavisimost' KSD
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