Abstract
Results of the interaction of NaOH, KOH, Ca(OH) 2, and NH 4OH with amylose, over a temperature range of 283–313 K, using conductometric, viscometric, and equilibrium-dialysis methods, are presented. The specific conductance of the strong bases decreases in the presence of the biopolymer. Examination of the Walden product at a fixed concentration of a base and various concentrations of the polymer revealed binding of the base with the biopolymer. The results followed the Langmuirian isotherm, indicating weak binding, accompanied by a free-energy change of ∼12 kJ/mol. The interaction of amylose and the weak base NH 4OH was conspicuous. The specific conductance showed an increment in the presence of amylose, as well as of d-glucose and poly(ethylene glycol), all of which are polyoxygen-centered non-electrolytes. An increase in the Walden product at a fixed concentration of base and various concentrations of polymer indicated an increase in the degree of dissociation of the weak base over and above its binding with amylose. Evaluation of the degree of dissociation of NH 4OH in the presence of d-glucose and amylose has been attempted.
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