Comparison of Some Physicochemical Properties of Alginic Acids of Differing Composition

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Abstract
Because of the intriguing Theological behavior of alginates and unanswered questions concerning the solution conformation of these biopolymers, some of the physicochemical properties of alginates were investigated by means of light-scattering, rheology, optical rotation, nuclear magnetic resonance, and near infrared spectroscopy studies. Alginic acid from Macrocystis pyrifera was fractionated into L-guluronate and D-mannuronate rich fractions. Light scattering and viscosity studies indicated that the fractionated materials had lower weight-average molecular weights, root-mean-square end-to-end distances, and intrinsic viscosities. Our data suggest that the L-guluronate rich polymers may have a more rigid solution conformation, in the presence of 0.1 M NaCl at 20°, than do those polymers more abundant in D-mannuronic acid. In addition, the alginate

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