The liquid CO2 was pressurized to the desired pressure,then run through a long tubular preheating coil with a lengt hof 4m,where it reached the specified temperature
prior to contacting the sample in the extractor vessel.
The extractor was immersed in a temperature-controlled water bath.A back-pressure regulator (ModelBP-1580-81,Jasco Corporation,Japan) was used to set the system pressure. Extractions were performed with a constant flowrate of 2mLmin1, and the
extraction time was set by the timer.Three operating variables were used in the study:pressure,temperature,and dynamic extraction time.They were chosen according to the preliminary study.There were two stages o fextraction:staticand dynamic. The static stage was30min for all experiments,and the dynamic stage varied from 27–92 min.Extracts were collected during the dynamic stage in amber vials(5mL) fitted with silicone septa.
The essential oil was refrigerated at4 1C prior to the analysis to prevent chemical reactions such as isomerization and oxidation.
The liquid CO2 was pressurized to the desired pressure,then run through a long tubular preheating coil with a lengt hof 4m,where it reached the specified temperatureprior to contacting the sample in the extractor vessel.The extractor was immersed in a temperature-controlled water bath.A back-pressure regulator (ModelBP-1580-81,Jasco Corporation,Japan) was used to set the system pressure. Extractions were performed with a constant flowrate of 2mLmin1, and theextraction time was set by the timer.Three operating variables were used in the study:pressure,temperature,and dynamic extraction time.They were chosen according to the preliminary study.There were two stages o fextraction:staticand dynamic. The static stage was30min for all experiments,and the dynamic stage varied from 27–92 min.Extracts were collected during the dynamic stage in amber vials(5mL) fitted with silicone septa.The essential oil was refrigerated at4 1C prior to the analysis to prevent chemical reactions such as isomerization and oxidation.
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