Using a recently developed automated viscometer (Grupi, A.; Minton, A. P. Anal. Chem. 2012, 84, 10732-10736), the dependence of solution viscosity upon the concentrations of bovine serum albumin, hen egg ovomucoid, and human fibrinogen have been measured individually and in binary and ternary mixtures over a wide range of compositions and at total concentrations of up to 300 g/L. The concentration dependence of viscosity of all solutions is quantitatively described over the entire range of concentrations and compositions by a semiempirical equation requiring specification of only two composition-independent global parameters per protein.
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