Dilute solutions of compositionally heterogeneous κ-carrageenan studied by combined dynamic and static light scattering

ABSTRACT Dilute water–salt solutions of compositionally heterogeneous κ-carrageenan (κ-CG) containing 3% of ι-CG units are studied by combined static and dynamic (DLS) light scattering in 0.1M NaCl at 25°C. The structure-sensitive ratio Rg/Rh = 2.2 of the fast DLS mode corresponds to the coils of κ-CG homopolymer. The irreversible core–shell aggregates (Rg/Rh = 0.4) give rise to a slow mode. The optical rotation reveals that the aggregates originate from helical fragments of contaminating multi-block κ/ι-copolymers. Comparison with capillary viscometry shows that the weight fraction of aggregates is as small as the fraction of contaminating κ/ι-hybrids.

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