Oxidative stability was measured following the American Oil Chemists’ Society (AOCS) Cd 12b-92 method (AOCS
1996) using Rancimat equipment, model 743 (Metrohm,Herisau, Switzerland), which is based on the determination
of the electric conductivity of volatile product degradation. The determination was made at 100C with a 20 L/h air flow
using 3 g of the sample and 60 mL of distilled water in flasks with electrodes. Electrical conductivity versus time was automatically registered and the period of induction was expressed in hours.