IPR Results at Variable Temperatures
Experimental IPR data for the five FAME at variable temperatures are summarized in Table 1 .
Also shown in the table are ‘Q10’ ratios and response factors (RF). These are defined as follows:
Q10 = (IPR at T)/(IPR at T + 10 °C) (12)
RF = (IPR of FAME)/(IPR of MeC18:1) (13)
where T = temperature. The RF was calculated using IPRdata measured at the same T for the FAME and MeC18:1, which limited the results shown in the table to the range T = 90-130 °C for measuring the IPR of MeC18:1.
Table 1 Oxidation induction period measured by Rancimat instrument (IPR) of fatty acid methyl esters (FAME)