The hydrolysis of p-nitrophenyl phosphate in the presence of polyethyleneimine has a complex pH dependence which may be explained by the electrostatic interaction between substrate and polymeric chains (polyelectrolyte effect); in alkaline solutions this effect is probably coupled with the nucleophilic attack on the substrate by the amino-groups of the polyelectrolyte.
R. Fernández-Prini and D. Turyn, J. Chem. Soc., Chem. Commun., 1972, 1013 DOI: 10.1039/C39720001013
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