疎液性ゾルにおけるフィブロインの保護作用と凝集作用について

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タイトル別名
  • ON THE PROTECTING AND COAGULATING ACTIONS OF FIBROIN ON LYOPHOBIC SOL
  • ソエキセイ ゾル ニ オケル フィブロイン ノ ホゴ サヨウ ト ギョウシュウ サヨウ ニ ツイテ

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In order to examine the interfacial-chemical properties of silk proteins, the coagulation and protection on positive silver iodide sol by fibroins at various pH and ionic strength were investigated.<br>The native fibroins were extracted from the posterior section (p-fibroin) and the middle section (m-fibroin) of the silk gland of B. mori larva at the third day of the fifth instar. The regenerated fibroin (r-fibroin) was prepared from native cocoon layer. The following are the results obtained, <br>1) The isoelectric points determined by ultra-micro-electrophoresis are in the pH value of 3.7 to 4.0 for both native and regenerated fibroins. There is no marked difference between the two fibroins and these values were in good agreement with these found by the experiments on the protection.<br>2) Both m-fibroin and r-fibroin coagulate the sol in all the region of pH, while p-fibroin coagulates only when p-fibroin and the sol particle charged oppositely with each other. However, when the ionic strength of the sol is increased the coagulation occurs even in the pH-region where p-fibroin and the sol particle have the same charge.<br>3) Both m-fibroin and r-fibroin protect the sol, but p-fibroin does not. The protection effect decreased in the neighborhood of the isoelectric point and the extent of the decreases was less than in the case of sericin.<br>4) The stability factor in the pH-region where fibroin and sol particle charge oppositely with each other is lower than in the pH-region when they are in the same charge. The stability factor is almost equal to unity in agreement with the theory of rapid coagulation.<br>5) It is therefore presumed that the molecular weight of both m-fibroin and r-fibroin is equal and but that of p-fibroin is lower than that of both of them.

収録刊行物

  • 繊維学会誌

    繊維学会誌 26 (11), 495-506, 1970

    社団法人 繊維学会

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