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General Information
Editor-in-chief
Prof. T. Hikmet Karakoc
Anadolu University, Faculty of Aeronautics and Astronautics, Turkey

IJET 2009 Vol.1(4): 306-309 ISSN: 1793-8236
DOI: 10.7763/IJET.2009.V1.60

Modelling the kinetics of Seedless Guava (Psidium guajava L.) Peroxidase Inactivation due to Heat and Thermosonication Treatments

A. GANJLOO, R. A. RAHMAN, J. BAKAR, A. OSMAN, and M. BIMAKR

Abstract—Effect of heat and thermosonication on inactivation kinetics of peroxidase in seedless guava have been studied over a temperature range of 80-95°C. Application of thermosonication was studied at 25, 50 and 75% of radiation intensity at the same temperature range. Ultrasonic wave’s intensity had significant (P<0.05) effect on peroxidase inactivation rate except the 25% intensity radiation. In both treatments, the enzyme kinetics showed a first-order kinetics model with monophasic behaviour. The activation energy, the rate constants were estimated which proving that the enzyme became more heat labile. Therefore, thermosonication can affect a process with reduced processing time and increased efficiency.

Index Terms—Peroxidase inactivation, Seedless guava, Thermal inactivation, Thermosonication.

A. GANJLOO is with the Department of Food Technology, Faculty ofFood Science and Technology, Universiti Putra Malaysia 43400 Serdang, Selangor D. E., Malaysia.
R.A. RAHMAN is with Department of Process and Food Engineering, Faculty of Engineering, Universiti Putra Malaysia 43400 Serdang, Selangor D. E., Malaysia
J. BAKAR is with the Department of Food Technology, Faculty of Food Science and Technology, Universiti Putra Malaysia 43400 Serdang, Selangor D. E., Malaysia
A. OSMAN is with the Department of Food Science, Faculty of Food Science and Technology, Universiti Putra Malaysia 43400 Serdang, Selangor D. E., Malaysia
M. BIMAKR is with the Department of Process and Food Engineering, Faculty of Engineering, Universiti Putra Malaysia 43400 Serdang, Selangor D. E., Malaysia
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Cite : A. GANJLOO, R. A. RAHMAN, J. BAKAR. OSMAN3 and M. BIMAKR, "Modelling the kinetics of Seedless Guava (Psidium guajava L.) Peroxidase Inactivation due to Heat and Thermosonication Treatments," International Journal of Engineering and Technology vol. 1, no. 4, pp. 306-309, 2009.

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