The estimation of threonine and serine in proteins

Abstract

absolute values of tyrosine and tryptophan in 'pure' proteins. The proteins quoted in Table SUMMARY 1. The ultra-violet absorption spectra of tyrosine and tryptophan have been determined in 0 1 N- NaOH and the curves found to intersect at 257*15 and 294-4 m,u (E, 2748 and 2375, respectively).