The reactions of p-nitrophenylacetate with L-lysine hydrochloride and poly-L-lysine hydrobromide as a function of pH were investigated.
The results indicate that both compounds react with the substrate in the pH range 7.0-10.0 with an apparent optimum pH in the region near 9.65.
Poly-L-lysine reacts more rapidly over the entire pH range investigated than does L-lysine
