KINETIC STUDY ON THE NITROSATION OF DIBENZYLAMINE IN A MODEL SYSTEM

Article abstract of DOI:10.1016/0278-6915(94)90141-4

A kinetic study of the formation of N-nitrosodibenzylamine (NDBzA), from the nitrosation of dibenzylamine (DBzA) by sodium nitrite, was performed in a model system under conditions (temperature, pH) that are similar to those encountered in the industrial production of hams processed in elastic rubber nettings. The nitrosation reaction was carried out in a KH2PO4 buffer (0.5 M) at pH 5.8 and at a temperature of 69 deg C. Since DBzA is insoluble in an aqueous buffer system, a non-ionic surfactant, Tween 20, was used as a solubilizing agent. The nitrosation reaction exhibited first-order kinetics with respect to DBzA and second-order kinetics with respect to nitrite. The calculated rate constant was 4.7 +/- 0.5 M^-2/min. The pH profile of NDBzA formation eas also determined. The optimal pH of NDBzA formation, 3.12, was close to the pK_a of nitrous acid (HNO2, pK_a = 3.1).