Determination of Intrinsic Viscosity of Alginates.

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Abstract
A method for determination of intrinsic viscosity of alginates by extrapolation to zero rate of shear and zero concentration is described, and the importance of the extrapolation to zero rate of shear is discussed. The influence of salts and pH on the viscosity of alginate solutions has been investigated, and the viscosity was found to be independent of pH in the range from 4 to 12. Curves correlating the intrinsic viscosity with the relative viscosity of alginate solution at various concentrations determined at standardized conditions are given. A method for routine determination of intrinsic viscosity without isolation of the alginate by determining the apparent viscosity of the same solution at 2 different values of rate of shear is described.

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