Na alginate (I) solution showed non-Newtonian behavior at high viscosity. The rheol. of I solution was described as a function of shear gradient, temperature, pH value, and added salt concentration The addition of Ca2+ gave insoluble I; the viscosity of I increased and thioxotropy was observed in the presence of small amount of Ca2+. Neg. thixotropy of I was observed in certain Ca2+ concentration

Key words: SODIUM COMPOUNDS, SOLUTION, MANNOSE, PH VALUE, CALCIUM ION, SEAWEED PRODUCTS, RHEOLOGICAL PROPERTY, VISCOSITY, THIXOTROPY, GULOSE