Extraction of Pericarpium Zanthoxyli Essential Oil with High Content of Numb-Taste Components by Subcritical Fluid
Article
Figures
Metrics
Preview PDF
Reference
Related
Cited by
Materials
Abstract:
Subcritical fluid was used in this study to extract Pericarpium Zanthoxyli essential oil from zanthoxylum L. peels and the effects of different process conditions and fluid medium on the yield of essential oil and extraction rate of numb-taste components were investigated. The optimal extraction conditions using subcritical butane as the solvent were as follows: extraction temperature, 40 ℃; extraction time, 40 min; extraction times, 4. Under these conditions, the essential oil extraction yield was 11.11% and the extraction rate of numb-tasted components was 59.81%. The yield of essential oil increased to 11.96%~12.68% when anhydrous ethanol was added at a volume fraction of 4~6% in subcritical butane and the extraction rate of numb-taste components was 91.96%~96.56%., Impurities content in Pericarpium Zanthoxyli essential oil increased significantly with the increasing concentrations of ethanol in the mixed fluid medium which resulted in a poor quality of the products. Subcritical butane had a good effect on extracting volatile oil in Pericarpium Zanthoxyli while an opposite effect on extraction rate of numb-taste components. The mixed subcritical medium had a high-efficient extraction of volatile oil and numb-tasted components from Pericarpium Zanthoxyli simultaneously with a low temperature, which allowed obtaining the Pericarpium Zanthoxyli essential oil with a high content of numb-taste components. The proposed method had an important value for practical application.
