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| Ultrasonic crushing extraction process of carnosic acid from rosemary leaves and its antioxidant effect on oil |
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| DOI： |
| KeyWord:rosemary leaves carnosic acid ultrasonic crushing extraction antioxidation |
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| Abstract: |
| Rosemary leaves are rich in antioxidant component, especially carnosic acid, which has strong antioxidant activity and good thermal stability.The optimal technology of extracting carnosic acid from rosemary leaves by ultrasonic crushing was studied. The effects of ratio of material to liquid, ethanol volume fraction, ultrasonic power and ultrasonic time on the extraction rate of carnosic acid were investigated by single factor experiment and orthogonal experiment. The antioxidant effect of carnosic acid from rosemary leaves on oil was studied by Schaal oven method. The results showed that the optimal extraction conditions of carnosic acid from rosemary leaves by ultrasonic crushing were obtained as follows: with anhydrous ethanol as solvent, ratio of material to liquid 1∶?10, ultrasonic power 600 W and ultrasonic time 2 min. Under these conditions, the extraction rate of carnosic acid from rosemary leaves was 936%. The analysis of antioxidant activity showed that carnosic acid from rosemary leaves had strong antioxidant activity to oil and the antioxidant capacity was positively correlated with dosage of carnosic acid. |
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