羊毛繊維の酸化染料染色におけるジスルフィド結合の役割

摘要

We have investigated the effects of disulphide bond scission induced by peracetic acid and thioglycolic acid on the dye uptake of dinuclear oxidation dyes into wool fibers. The wool samples which the disulphide linkage was severed by both peracetic acid and thioglycolic acid were dyed the faint color compared to the intact wool sample. The increasing in the peracetic acid treatment time leads to more decrease in the dye uptake. These treatments lead to a slight decrease in the metal ion content in the modified wool fibers. This decrease, however, was ensured to have little effect on the dye uptakes. Consequently, this result implies that the disulphide bond within the wool fibers plays an important role in developing the colored products in the fibers. From these finding, we assumed that the disulphide bond in keratin components is attributed to the regeneration of catalytic ability of metal ions by conjugated redox reaction due to the disulphide exchange reaction, and then proposed the cyclically catalytic mechanism in which a conjugated redox reaction was carried out across the intercuticular material.%我々は，ケラチン繊維に対する酸化染料の染着機構お よび染着領域に関する知見を得ることを目的として検討 を行っている.これまでのところ，酸化重合反応が染液/ 繊維界面で進行し，生成した酸化染料前駆体（ロイコ体） あるいは発色酸化染料（酸化体）が繊維内に浸透拡散する ことによって染色されることを明らかにするとともに， その主な染着領域が細胞膜複合体であることを明らかに した［1］.また，細胞膜複合体の構成成分である金属イオ ンが酸化重合反応の開始剤として働くラジカルの生成触 媒として作用することを報告した［2］.