牛皮コーラーゲン膜における膜電位とイオン

概要

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In order to investigate the ionic permeability of regenerated collagen membrane obtained from a bovine hide, the membrane potentials by chlorides, bromides and iodides of potassium and sodium were measured, together with the permeation rates of these salts through the membrane. The membrane potentials by potassium salts are higher than those by sodium salts. On the other hand, the difference among the halogen salts is scarcely recognized. The isoelectric point of regenerated collagen, which is obtained from the membrane potentials, is pH 5.0, whereas that of a splitted middle layer of bovine corium is pH 8.3. The permeability of the salts increases according to the sequence: KI=KBr>KCl>NaI=NaBr >NaCl. In the measurements of pH dependence, the permeability of potassium chloride becomes minimum at the isoelectric point of the membrane. The permeability is mainly governed by the mobilities of ions and the swelling of the membrane, while the effect of the membrane charge on the permeability is small. This results from the high swelling degree of the membrane.
社団法人日本農芸化学会の論文