Abstract
C. I. Reactive Blue 19 (mono-functional reactive dye of sulfatoethylsulfon type) exhibits the good fixation for silk in weak acidic, neutral and weak alkaline solutions. Maximum fixation was achieved to about 80% in the pH range 7-8.
The products of this reaction were analysed by automatic analysis of amino acids reacted with silk. Here, two methods-analysis of filtrate and precipitate after hydrolysis of dyed-and blank dyed-silks were used.
As the result it has become apparent that the following amino acids reacted with C. I. Reactive Blue 19:
At pH 4; histidine, arginine, isoleucine
At pH 7; lysine, histidine, arginine, aspartic acid, serine, glutamic acid, glycine, alanine, valine, isoleucine, leucine, tyrosine
At pH 10; lysine, histidine, arginine, aspartic acid, serine, glycine, alanine, valine, isoleucine, leucine, tyrosine.
Especially lysine and histidine were very important, for these amino acids occupied 75-78% (pH 7), 54-69% (pH 10) of all reacted amino acids.
