Physicochemical properties and compatibility of sodium alginate and fucoidan solutions

The interaction between linear sodium alginate and branched fucoidan were investigated using viscosity and tensiometric measurements. It was shown that water-soluble interpolymer complex is formed. The alginatefucoidan complexation is due to the formation of a cooperative system of hydrogen bonds between the ionogenic and hidroxyl groups of sodium alginate and fucoidan and hydrophobic interactions. The intensity of the polysaccharide-polysaccharide interaction increases with an increase in the content of fucoidan in the blend. It was established that alginate and fucoidan are weak surfactants of the associative type. The surface activity of fucoidan was 34.6 mN & BULL;m2/mol, and for alginate was 20.7 mN & BULL;m2/mol. The resulting alginate-fucoidan interpolymer complex exhibits high surface activity and indicates a synergistic effect of combining two polysaccharides. The values of the activation energy of the viscous flow process were 7.0 kJ & BULL;mol-1, 16.2 for kJ & BULL;mol- 1 and 33.9 kJ & BULL;mol- 1for alginate, fucoidan and their blend, respectively. These studies provide a methodological basis for determining the conditions for preparation of homogeneous film materials with a certain complex of physico-chemical and mechanical properties.

Automated summary

Viscosity and tensiometric measurements were used to investigate the interaction between linear sodium alginate and branched fucoidan. The results showed the formation of a water-soluble interpolymer complex due to hydrogen bonding and hydrophobic interactions. The intensity of the interaction increased with an increase in fucoidan content. Both alginate and fucoidan exhibited weak surfactant properties. The resulting alginate-fucoidan complex had high surface activity and showed a synergistic effect. The activation energy for viscous flow process was determined for each component and their blend.