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首页> 外文期刊>Food and Bioproducts Processing. Transactions of the Institution of Chemical Engineers, Part C >Comparison of essential oils compositions of Nepeta persica obtained by supercritical carbon dioxide extraction and steam distillation methods
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Comparison of essential oils compositions of Nepeta persica obtained by supercritical carbon dioxide extraction and steam distillation methods

机译：超临界二氧化碳萃取和水蒸气蒸馏法获得的荆芥荆芥油成分比较

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摘要

Essential oil of Nepeta persica cultivated in Iran was obtained by steam distillation and supercritical (carbon dioxide) extraction methods. The oils were analysed by capillary gas chromatography using flame ionization and mass spectrometric detections. The compounds were identified according to their retention indices and mass spectra (EI, 70 eV). The effects of different parameters such as pressure, temperature, modifier volume and extraction times (dynamic and static) on the supercritical fluid extraction (SFE) of N. persica oil were investigated. The results showed that under the pressure of 20.3 MPa, temperature of 45 degree C, methanol of 1.5% v/v), dynamic extraction time of 50 min and static extraction time of 25 min extraction was more selective for the 4 alpha beta ,7 alpha ,7a alpha -nepetalactone. Twelve compounds were identified in the steam-distilled oil. The major components of N. persica were 4 alpha beta ,7 alpha ,7a alpha -nepetalactone (26.5%), cis- beta -farnesene (4.4%) and 3,4 alpha -dihydro-4a alpha ,7 alpha ,7a alpha -nepetalactone (3.5%). However, by using supercritical carbon dioxide under optimum conditions, only two components have more than 90.0% of the oil. The extraction yield based on steam distillation was 0.08% (v/w). On the other hand, using SFE extraction yield in the range of 0.22-8.90% (w/w) were obtained at different conditions. The results show that, in Iranian N. persica oil, 4 alpha beta ,7 alpha ,7a alpha -nepetalactone is a major component.
机译：通过蒸汽蒸馏和超临界（二氧化碳）萃取方法获得了伊朗种植的荆芥（Nepeta persica）精油。通过毛细管气相色谱使用火焰离子化和质谱检测对油进行分析。根据其保留指数和质谱（EI，70 eV）鉴定化合物。研究了压力，温度，改性剂体积和提取时间（动态和静态）等不同参数对紫苏油超临界流体萃取（SFE）的影响。结果表明，在20.3 MPa的压力，45摄氏度的温度，1.5％v / v的甲醇），50分钟的动态萃取时间和25分钟的静态萃取时间下，对4 alpha beta，7的选择性更高。 alpha，7a alpha-荆芥内酯。在蒸汽蒸馏油中鉴定出十二种化合物。波斯猪笼草的主要成分是4 alpha beta，7 alpha，7a alpha -nenetalactone（26.5％），顺式beta -farnesene（4.4％）和3,4 alpha -dihydro-4a alpha，7 alpha，7a alpha-荆芥内酯（3.5％）。但是，通过在最佳条件下使用超临界二氧化碳，只有两种成分的油含量超过90.0％。基于水蒸气蒸馏的提取产率为0.08％（v / w）。另一方面，使用SFE，在不同条件下的萃取产率为0.22-8.90％（w / w）。结果表明，在伊朗波斯菊油中，4 alpha beta，7 alpha，7a alpha -nepetalactone是主要成分。

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