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The formation of cysteine‐ S ‐sulphonate groups in wool and the effect on shrink‐resistance
Author(s) -
Douthwaite F J,
Lewis D M
Publication year - 1994
Publication title -
journal of the society of dyers and colourists
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.297
H-Index - 49
eISSN - 1478-4408
pISSN - 0037-9859
DOI - 10.1111/j.1478-4408.1994.tb01663.x
Subject(s) - cysteic acid , cystine , wool , chemistry , cysteine , salt (chemistry) , oxidizing agent , sulfur dioxide , fourier transform infrared spectroscopy , disulfide bond , polymer chemistry , nuclear chemistry , organic chemistry , biochemistry , chemical engineering , materials science , engineering , composite material , enzyme
The different stages of wool oxidation during the Dylan XCP permonosulphuric acid based shrinkproofing process have been followed using second‐order derivative Fourier transform infrared analysis. After oxidising wool with Caro's salt, some of the cystine residues present were oxidised to cysteic acid, but cystine‐S‐monoxide and cystine‐S‐dioxide concentrations remained the same. After treating the oxidised wool with bisulphite, cysteine‐S‐sulphonate groups were formed and the fibre acquired significant shrink‐resistance to washing. The effect on shrink‐resistance of reducing the concentration of cysteine‐ S ‐sulphonate groups was determined. It was found that when these residues were reconverted to disulphide bonds the shrink‐resist effect was lost.