Study on the Chemical Constituents of the Extractive from Episperm of Torreya Grandis by Supercritical CO_2 and Steam Distillation Method

The extracts of Torreya grandis epispem were obtained by both supercritical CO2 extraction and steam distillation,and their chemical compositions were analyzed by GC-MS qualitatively and quantitatively.40 components were identified in the extract by supercritical CO2 extraction,and the main components were methyl torreyagrandate(14.90%) and 7,15-pimaradiene-3-one(14.45%).However,the main components in the extract obtained by steam distillation were limonene(32.90%) and β-pinene(13.48%).It was found based on functional group that the chemical compositions of the products extracted by supercritical CO2 extraction were more comprehensive and balanced;while the main chemical compositions of the products extracted by steam distillation were monoterpenes with low boiling point.