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The effect of the ratio of mannuroic acid to gluronic acid on the solution properties of sodium alginate were examined by using two samples of which the M/G ratios were 2.7 and 0.5. The reduced viscosity could not be treated according to the Huggins' equation over a critical concentra-tion. The critical concentrations also corresponded to the critical point of the concentration dependence of the activation energy of flow, and were ca. 1.0g/dl for the M-rich sample and ca. 0.5g/dl for the G-rich sample. The results showed that the G-rich sample has a large chain ent-anglement in solution.

Effect of ratio of mannuroic acid to gluronic acid on solution properties of sodium alginate.