Abstract
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 KH 2PO 4 buffer (0.5 m) at pH 5.8 and at a temperature of 69 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 was also determined. The optimal pH of NDBzA formation, 3.12, was close to the pK a of nitrous acid (HNO 2, pK a = 3.1).
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