Figure 3. Loss of substrate on γ-irradiation of tyrosine, tyramine, N-acetyltyrosine (NAT) and p-hydroxyphenylacetic acid (pOH-PA).

γ-Irradiation was performed at pH 7.4 under the conditions described in the Experimental section. □, Parent compound measured by HPLC; ▪, dimer measured by fluorescence. Results represent means and S.E.M. from four independent experiments.