The rosemary extract is a new natural antioxidant. In this study, the stability of palm oil with rosemary
extract during frying and accelerated storage was studied. The antioxidant of palm oil with different concentrations
of rosemary ethanol extract were evaluated at 180 ◦C and 65 ◦C. The effect of rosemary ethanol
extract was also compared with the one of synthetic antioxidants. Results showed that the optimum addition
of rosemary ethanol extract in palm oil during frying and accelerated storage were 0.12 g/kg and
0.7 g/kg. Under such conditions, a significant antioxidant effect was observed. Rosemary ethanol extract
can effectively reduce the peroxide value, P-anisidine value, free fatty acid value and absorbances at 232
and 268 nm, especially in the long-time frying process. It can also reduce the production of saturated fatty
acids after 25 h of frying and 24 d of accelerated storage. Under frying condition, the oil with rosemary
ethanol extract showed an enhanced stability compared to the oil with synthetic antioxidants. Under
accelerated storage condition, rosemary ethanol extract could prevent the palm oil from oxidation the
same as the synthetic antioxidants, but it is safer than synthetic antioxidant