Saraiva, JorgeOliveira, Jorge C.Lemos, AdíliaHendrickx, Marc2011-10-142011-10-141996SARAIVA, Jorge [et al] - Analysis of the kinetic patterns of horseradish peroxidase thermal inactivation in sodium phosphate buffer solutions of different ionic strength. International Journal of Food Science and Technology. ISSN 0950-5423. 31:3 (1996) 223-231http://hdl.handle.net/10400.14/6096The thermal inactivation of horseradish peroxidase was studied in sodium phosphate buffer solutions and in pure water at pH 7 in the temperature range of 70–95°C. The sodium phosphate ions concentration affected both the thermostability and the kinetic patterns and had a stabilizing effect. The gradual change observed at low concentrations made a series-type mechanism theoretically more coherent with the experimental observations than the conventionally applied two-fraction model. In water the kinetics is apparently First order at high temperatures, while the results obtained at 25°C support the occurrence of a series-type inactivation mechanism. The pH and enzyme concentration also affect the inactivation proFile, supporting the conclusion that the thermal inactivation is not a monomolecular process with respect to protein concentration.engEnzyme inactivationkinetic modelsjournal article10.1046/j.1365-2621.1996.00342.x