Effect of sugars and acids on the viscosity of 0.3-1.0% solution of carboxymethylcellulose (CMC-Na) was investigated. Specific viscosity of CMC-Na solution containing sucrose or glucose was much higher than the sum of those of each solution at corresponding concentration. By addition of lactic or malic acid, the viscosity of CMC-Na solution decreased with its pH decrease, however such decrease was not observed at the presence of the sugars in the solution. These results may be interpreted by the increase of the interaction of the molecules resulting from intertwining or bridging between CMC-Na and sugars.
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Furuuchi et al. (1968) studied this question.