The samples containing TBHQ revealed values that were similar to those of the SO treatment. Their values did not differ until after 20 h of heating. When the RE + TBHQ treatment was used, the rosemary extract was the main one responsible for the antioxidant effect. After 20 h of heating, this treatment had values of total polar compounds that were statistically equivalent to those of the RE treatment and which were lower than those of the TBHQ treatment. No synergism between rosemary extract and TBHQ was found. The RE and RE + TBHQ samples showed no significant difference after 20 h of heating