超临界CO2萃取法提取库尔勒香梨精油及其成分分析研究

采用超临界CO2萃取法提取库尔勒香梨精油，用气相色谱-串联质谱技术对其成分进行分析，并对几种提取方法进行综合比较。结果表明，与水蒸气蒸馏法、固相微萃取法相比，超临界CO2萃取法具有香梨精油提取率最高，为0．0549％。感官分析的结果表明，超临界CO2萃取法所得的库尔勒香梨精油颜色为橙色透明液体，而且风味好。气相色谱-质谱联用（GC-MS）分析结果表明：超临界CO2萃取法所得的香梨精油中共鉴定出28种成分。丁酸乙酯、顺-7-十四烯-1-醇和乙酸己酯的含量最高，含量分别为5．19％、4．85％和4．37％。

Supercritical CO2 Extraction and Composition Analysis of Essential Oil from Kuerle Fragrant Pear*

The essential oil from kuerle fragrant pear is extracted by supercritical CO2 extraction method, steam distillation and the solid phase rniero-extraction. The results show that compared to the yield of essential oil by supercritical CO2 extraction of essential oils was 0. 0549%, which was higher than that of steam distillation and solid phase micro extraction. Sensory analysis results showed that the essential oil obtained by supercritieal CO2 extraction was orange, transparent liquid oil, and taste good. 28 compounds were identified in the essential oil of kuerle fragrant pear. The compositions of the essential oil was then identified by gas chromatography-mass spectrometry （GC-MS） ,28 compounds had been characterized. The content of Ethyl butyrate was the highest,which was 5.19%.