Abstract
Water-insoluble polyelectrolyte complexes (PEC) containing chitosan derivatives, glycol chitosan (GC-poly(vinyl sulfate) (PVSK) and methyl glycol chitosan (MGC)-GC-PVSK systems, were prepared in aqueous solution at various hydrogen ion concentrations. The molecular composition of each PEC was dependent on pH, since the degree of dissociation and conformation of GC were affected by pH. PEC membranes were prepared, and their transport properties were investigated. Measurements of the transport ratio of Na+ and K+ and electric potential difference between both sides of the membrane suggested that the driving force of the uphill transport is due to the membrane potential, that is, the sum of the Donnan potential and diffusion potential. The transport selectivity of K+ was higher than that of Na+. The permeabilities of KCl, urea, and sucrose were also determined at various pH in the case of the GC-PVSK membrane, and were found to be controllable by the solution pH. GC was modified with 3,3′-dithiodipropionic acid (DTPA) which causes the thiol↔disulfide transition through a redox reaction.
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