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| Optimization of extracting oil-soluble rosemary antioxidants |
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| DOI： |
| KeyWord:rosemary antioxidant oil-solubility carnosic acid carnosol response surface methodology |
| FundProject:2018年湖南省教育厅双一流学科优秀青年项目（18B422）；2020年湖南省研究生科研创新项目（20201186） |
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| Abstract: |
| The rosemary leaves was pretreated by extracting essential oil with steam distillation and boiling method, and then was used to extract oil-soluble antioxidant. The edible oil without antioxidant was used as the extractant, oil-soluble antioxidants（carnosic acid and carnosol） yield was used as evaluation index, the effects of extraction temperature, material-liquid ratio, extraction time and extraction times were studied by single factor experiment. On the basis of single factor experiment, the response surface methodology was used to optimize the extraction conditions. The results showed that the optimal extraction conditions with the rosemary leaves pretreated by extracting essential oil with boling method were obtained as follows: extraction temperature 61 ℃, material-liquid ratio 1∶ 11, extraction time 61 min and extraction times 5. Under these conditions, the yield of oil-soluble antioxidants was 2.860 1%. For the rosemary leaves pretreated by extracting essential oil with steam distillation method, the optimal extraction conditions were obtained as follows: extraction temperature 71 ℃, material-liquid ratio 1∶ 11, extraction time 81 min and extraction times 4. Under these conditions, the yield of oil-soluble antioxidants was 3.801 3%. The yield of oil-soluble antioxidants of rosemary leaves pretreated by extracting essential oil with steam distillation method was higher than that by extracting essential oil with boiling method. |
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