STUDIES ON CYSTINE IN WOOL

Abstract

The estimations of SH groups in TGA-treated wool were done according to the previous paper and some differences in mechanism of TGA-treatment on wool between in acidic and basic mediums are discussed:1) The quantity of adsorbed mercaptide and P-CMB, except P-CMB consumed by reaction with combined SH in wool decreases with the rise of pH value of P-CMB solution. The same tendency is shown with regard to the ratio of adsorbed mercaptide to adsorbed P-CMB.2) The quantity of disulphide bonds ruptured during the reaction of wool with P-CMB increased with the rise of PH value when the wool was treated with TGA, especially done on acidic side.3) The reaction of wool with P-CMB can not be held at lower PH. This and another reason pointed at (2) make it difficult to estimate accurately the combined SH content in TGA-treated wool; the detected value of it is some what larger.4) The quantity of adsorbed TGA is large for the wool treated with TGA singly, but is less for the one done with alkaline medium, and in the case of the latter the detected SH nearly coincides with the combined SH.5) It is also proved polarographically that existence of other anion in TGA solution reduces the adsorption of TGA on wool, but it gives little effect in basic medium and that the decrease of SH content of TGA-treated wool by rinsing is more remarkable in acidic medium than in the basic.