Robert et al. (2001) demonstrated that the oxidative stability of potato chips is influenced by the type of oil used in
the frying process. The potatoes fried in partially hydrogenated sunflower oil had a higher level of stability when
compared with those prepared with sunflower oil. Their results highlight the importance of the fatty acid composition
of raw oils in the oxidative process. In this study, the levels of linoleic acid and a-linolenic acid decreased as heating time increased. Comparing the initial oil samples to oil collected after 20 h of heating, the reduction of linoleic acid occurred in higher percentages after the SO treatment (8.44%), followed by RE + TBHQ (7.91%), TBHQ (6.64%) and RE (4.16%). However, in the case of a-linolenic acid, the reduction was higher after SO treatment (25.43%), followed by TBHQ (25.08%),
RE + TBHQ (22.5%) and RE (16.83%). The data showed
that there was no synergistic effect between rosemary
extract and TBHQ.