Title: PSEUDOPLASTIC AND RHEOPECTIC PROPERTIES OF A GLOBULAR PROTEIN (β‐LACTOGLOBULIN) SOLUTION<sup>1</sup>
Abstract: ABSTRACT The apparent viscosity of β‐lactoglobulin solutions was studied as a function of shear rate using a cone and plate uiscometer (Ferranti‐Shirley Viscometer System). Aqueous buffered solutions (pH 7, ionic strength 0.04) containing up to 40% protein were subjected to a rate of shear between 800 and 17,000 sec ‐1 . At protein concentrations of 5% and lower, the viscosity was independent of the shear rate or the time of shearing. At protein concentrations of 10% or higher, the viscosity decreased asymptotically with an increasing shear rate. At a constant shear rate, the viscosity of 10‐30%β‐lactoglobulin solutions increased with shearing time. However, this rheopectic property was not consistently observed but, rather, was dependent on the rate of shear at concentrations lower than 20%. A rheopectic hysteresis effect was observed for 10‐30% protein solutions whereas thixotropy was observed for 40% solutions. The rheopectic nature appeared to be the result of the permanent denaturation of protein characterized by UV absorption and gel filtration.
Publication Year: 1977
Publication Date: 1977-09-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 26
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