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Action of Nucleophilic Reagents on Wool:II‐Action of Sodium Sulphite at pH 8·6 *
Author(s) -
MIRÓ P.,
GARCÍADOMÍNGUEZ J. J.
Publication year - 1968
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.1478-4408.1968.tb02831.x
Subject(s) - lanthionine , chemistry , reagent , salt (chemistry) , wool , solubility , hydrolysis , thiourea , nucleophile , sodium , urea , organic chemistry , biochemistry , amino acid , catalysis , archaeology , history
The sulphitolysis of wool at pH 8·6 has been studied at various temperatures. The lanthionine formed is not obtained by either ( a ) hydrolysis or ( b ) the salt effect of sodium sulphite. The fact that no lysinoalanine could be detected, although the lanthionine content was high, supports a mechanism entailing an S n 2 type of nucleophilic substitution. Determination of the urea‐bisulphite solubility shows indirectly that lanthionine residues play some part in crosslinking. However, the amount of insoluble keratose formed indicates that crosslinking by lysinoalanine has occurred. The importance of lysinoalanine in this connection is emphasised.