Pertanika J. Sci. & Technol. 27 (S1): 169 - 178 (2019) ISSN: 0128-7680 e-ISSN: 2231-8526 SCIENCE & TECHNOLOGY Journal homepage: http://www.pertanika.upm.edu.my/ Article history: Received: 24 October 2018 Accepted: 15 February 2019 Published: 21 June 2019 ARTICLE INFO E-mail addresses: panlop062@gmail.com (Panlop Sintuya) varithj@gmaejo.mju.ac.th (Jaturapatr Varith) aoihighso@hotmail.com (Kanjana Narkprasom) yaidragon@mju.ac.th (Somkiat Jaturonglumlert) niwooti@hotmail.co.th (Niwooti Whangchai) danuwat_2493@hotmail.com (Danuwat Peng-ont) n_chanawat@hotmail.com (Chanawat Nitatwichit) * Corresponding author © Universiti Putra Malaysia Press Degradation Kinetics of Diazinon and Triazophos Pesticides in Dried Chili under Gaseous Ozone Fumigation Panlop Sintuya 1,2 , Kanjana Narkprasom 1 , Jaturapatr Varith 1 *, Somkiat Jaturonglumlert 1 , Niwooti Whangchai 3 , Danuwat Peng-ont 2 and Chanawat Nitatwichit 1 1 Graduate Program in Food Engineering, Faculty of Engineering and Agro-industry, Maejo University, Chiang Mai, 50290, Thailand 2 Institute of Product Quality and Standardization, Maejo.University, Chiang Mai, 50290, Thailand 3 Faculty of Fisheries Technology and Aquatic Resources, Maejo.University, Chiang Mai, 50290, Thailand ABSTRACT Dried chili is normally contaminated with pesticide residue as a result from the excessive uses of pesticide in the feld. The objective of this study was to determine the degradation kinetics of diazinon and triazophos pesticides in dried chili due to the oxidative potential of gaseous ozone fumigation. Both pesticides were spray-coated on dried chili and later fumigated with gaseous ozone at concentration rate of 5.5 g/hr for 30 min. Results showed that the degradation kinetic of diazinon and triazophos pesticides were presented on the frst-order kinetic reaction. After 30 min of ozone fumigation, diazinon and triazophos residues were decreased by 69% and 47% with the half-life (t 1/2 ) of 17.9 and 32.1 min, respectively. Scanning electron microscopy (SEM) images indicated that ozonated chili exhibited more rough surface morphology than unozoned chili. Ozone fumigation can be further developed as pesticide scrubber on agri-foods due to it high effciency in term of shortening of half-life period and rapid pesticide decay rate. Keywords: Degradation kinetics, diazinon, dried chili, half-life period, ozone, triazophos