Physico-chemical Studies of the Mixed Membrane composed of Gelatin and Chondroitin Sulfate. III. Permeability of Electrolytes and Its pH Dependence

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Abstract
The mixed membranes were prepared from gelatin and chondroitinsulfate (chs), whose fractions (Xchs) were 0.0, 0.108, 0.226, and 0.317. They were cross-linked by formaldehyde. The permeability of electrolytes (KCI and CaCl2) through the membranes and their pH dependence were investigated in order to elucidate the effects of Xchs and the formation of complex between gelatin and chs on the permeability. The permeability (P*) of KCl and CaCl2 decreased with the content of the membrane constituent (WM). The effect of Xchs on P* depended on the kind of electrolytes ; permeability of KCl decreasded with increasing, Xchs but that of CaCl2 was independent of it. In a strongly acidic region, effect of the concentration of hydrogen ion on P* (KCl as solute) varied with the fraction of chs (Xchs) ; permeability through the membranes with Xchs=0.0 and 0.108 increased as pH of the bulk solution departed from the isoionic point of gelatin (pH 4.9), but that through the membrane of Xchs=0.226 decreased apparently at pH 2.2. For these systems, the relations between WM and pH, and between P* and WM were investigated at various pH. From these results, it was found that the formation of the insoluble complex repressed the swelling of the membrane and decreased P*.

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