Abstract
Sodium alginate samples were extracted from brown seaweeds by various methods and the effect of the extraction procedure on the intrinsic viscosity and, by implication, the molecular weight were studied. Pre-treating the weeds with formaldehyde and ethanol prior to extraction with sodium carbonate or extracting the weeds under neutral conditions with selected calcium ion sequestrants resulted in alginates with enhanced intrinsic viscosities. The intrinsic viscosity of alginate samples during extraction decreases significantly with increasing pH due to the presence of phenolic compounds. By isolating the phenolic compounds with formaldehyde or extracting them with ethanol, degradation processes can be inhibited.
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