Abstract
Ca−alginate gels were studied by small-angle X-ray scattering and rheology to determine relations between chemical composition and concentrations of the alginate and the elasticity and structure of the gels. The gels were prepared by in situ release of Ca2+ from either Ca−EGTA or CaCO3 with total Ca2+ concentration in the range 5−30 mM. Alginates with low (39%), intermediate (50%), and high (68%) fractions of α-l-GulA originating from the brown algae Ascophyllum nodosum, Laminaria hyperborea leaf, and Laminaria hyperborea stipe, respectively, were employed. Two to three different degrees of polymerization for each chemical composition were used in the experiments. The excess small-angle X-ray scattering for the alginates in solution yielded linear cross-sectional Guinier plots, and the cross-sectional radius of gyration, Rg,c, was determined to be 3.1−4.6 A. The SAXS profiles of the alginate gels depended on the alginate concentration, Ca2+ concentration, and the alginate composition. The SAXS data sugges...
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