This study examined the antioxidant activity of lyophilized rosemary extract
added to soybean oil, subjected to thermoxidation conditions and also its synergistic effect with the synthetic antioxidant tertiary butylhydroquinone (TBHQ).
Soybean oil samples with no antioxidant added (SO), 3,000 mg/kg rosemary
extract (RE), 50 mg/kg TBHQ (TBHQ), and a mixture of those two antioxidants
(RE + TBHQ) were heated to 180C for 20 h. After 0, 10 and 20 h, the oxidative stability, total polar compounds, tocopherol content and fatty acid profile were determined. The addition of rosemary extract increased oxidative stability and resulted
in a lower formation of total polar compounds and a higher retention of tocopherols. The RE treatment showed the highest amount of polyunsaturated fatty
acids after 20 h. There was not any synergy between TBHQ and rosemary extract
in preventing oxidation of soybean oil. Rosemary extract showed a higher antioxidant potential when compared with TBHQ.
This study examined the antioxidant activity of lyophilized rosemary extractadded to soybean oil, subjected to thermoxidation conditions and also its synergistic effect with the synthetic antioxidant tertiary butylhydroquinone (TBHQ).Soybean oil samples with no antioxidant added (SO), 3,000 mg/kg rosemaryextract (RE), 50 mg/kg TBHQ (TBHQ), and a mixture of those two antioxidants(RE + TBHQ) were heated to 180C for 20 h. After 0, 10 and 20 h, the oxidative stability, total polar compounds, tocopherol content and fatty acid profile were determined. The addition of rosemary extract increased oxidative stability and resultedin a lower formation of total polar compounds and a higher retention of tocopherols. The RE treatment showed the highest amount of polyunsaturated fattyacids after 20 h. There was not any synergy between TBHQ and rosemary extractin preventing oxidation of soybean oil. Rosemary extract showed a higher antioxidant potential when compared with TBHQ.
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