Rancimat Test
Rancimat test carried out according to Laubli & Bruttel by the little modifications. During the lipid oxidation process are formed volatile acids that the rancimat test is based on the conductometric measurement of volatile acids. Oil samples (2.5 g) was oxidized in a reaction vessel at 140°C and air flow (20 L/h). The end of the induction period (IP) was determined by the sudden increase of water conductivity, due to the dissociation of volatile carboxylic acids (Laubli & Bruttel., 1986).