Note on the electrometric titration of dl-2-thiolhistidine

Abstract
The dissociation constants of dl-2-thiolhistidine were detd. to be pK1[image] 184, pK2[image] 8.47 and pK3[image] 11.4, corresponding respectively to the[long dash]COOH,[long dash]NH2 and[long dash]SH groups of the amino-acid.