ホルムアルデヒド処理コラーゲン膜の膜電位とイオンの透過性

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The regenerated collagen membranes obtained from a bovine hide were treated with formaldehyde solutions, and the membrane potential and the ionic permeability of these membranes for potassium and sodium chlorides were measured. From the results obtained, the effect of cross-linking with formaldehyde on the ion permeation through the membrane was discussed. The concentrations of formaldehyde solutions used for the hardening of the collagen membranes were 0.05, 0.5 and 2.5%. The amounts of formaldehyde combined with the membranes were 0.03, 0.25 and 0.32mM/g respectively. The membrane potential increases with an increase in the amount of combined formaldehyde, and the curve of membrane potential against pH for potassium chloride is shifted to lower pH regions: it is found from this curve that the isoelectric points of the collagen membranes treated with 0.05, 0.5 and 2.5% formaldehyde solutions are pH's 4.95, 4.8 and 4.7 respectively. The ionic permeability of formaldehyde tanned membranes becomes minimum at the isoelectric point of the membranes. However, the change in the permeability with pH decreases with an increase in the cross-linkage with formaldehyde: the permeability increases in the vicinity of the isoelectric point, while it decreases in the other regions.
社団法人日本農芸化学会の論文