Kinetic parameters of Rancimat test
Using a Rancimat 743 apparatus, oil samples (5g) were being tested for oxidative stability at 5 different temperatures (100, 105, 110, 115, and 120°C). The induction period(IP, hours) which is used as a measurement of oxidative stability, were automatically recorded at an air flow rate of 10L/h, and the intersected point of two extrapolated parts of the curves were taken as the IPs of each samples.
The samples’ kinetic parameters were established by following to previous described method (Farhoosh et al., 2008). Kinetic rate constant, temperature coefficients (T Coeff, K–1), activation energies (E a, kJ/mol) and pre–exponential or frequency factors (A, h–1) were defined by method described inprevious literature (Yang et al., 2018).