Kinetics of amylose retrogradation

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Abstract
This article deals with the kinetics of the retrogradation of amylose in aqueous solutions of pH 4.0, 9.2, and 11.9. The course of the retrogradation is followed by means of light‐scattering measurements. From our interpretation of the light‐scattering data we conclude that the retrogradation mechanism appears to be in qualitative agreement with von Smoluchowski's theory on coagulation. From the rate of retrogradation one may tentatively conclude that only a small fraction of the collisions between the amylose aggregates leads to permanent coagulation. In order to explain this phenomenon, additional conditions are suggested for permanent attachment of two colliding aggregates. The relevant fraction is smaller at pH 11.9 than at the lower pH's, a fact which is ascribed to the mutual repulsions of the aggregates due to their negative charges.
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