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Effect of concentration on apparent viscosity of a globular protein solution
Author(s) -
Pradipasena Pasawadee,
Rha Chokyun
Publication year - 1977
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760171209
Subject(s) - viscometer , viscosity , materials science , shear rate , aqueous solution , reduced viscosity , globular protein , shear stress , apparent viscosity , shear (geology) , thermodynamics , analytical chemistry (journal) , chemistry , chromatography , composite material , crystallography , organic chemistry , physics
The viscosity of a globular protein solution as a function of concentration was studied with a cone and plate viscometef (Ferranti‐Shirley Viscometer System) using, β‐lactoglobulin as a model. An aqueous buffer solution (pH 7, ionic strength 0.04) containing up to 40 percent protein was subjected to rates of shear between 800 and 17,000 sec −1 . Specific viscosity of β‐lactoglobulin up to 10 weight percent was proportional to the weight concentration of protein in solution such that: η s = η 0 [ 1+0.8 ( weight percent concentration )] where η 0 and η s are viscosity coefficients for the pure solvent and the solution, respectively. For 3‐40 weight percent, a linear relation of shear rate and shear stress was observed at high shear rates. Linearity began at 3500, 4300, 6800, and 7000 see −1 for 10, 20, 30 and 40 weight percent concentrations respectively. The apparent viscosity was lower below these critical shear rates.