In order to analyze the chemical composition and their relative contents in
essential oil of bergamot, bergamot essential
oil was extracted by supercritical carbon dioxide(SC-CO-2). The chemical compositions and their relative contents in
essential oil of bergamot were analyzed by GC-MS. The subject were fresh bergamot and dried bergamot from Jinhua. They were extracted respectively. The results were: 34 compounds were
identified from fresh bergamot oil and the yield was (16.2 mL5kg~(-1)). Dried bergamot was extracted by SC-CO-2 at two different period with different conditions, the yield was 9.6 mL5kg~(-1). 51 compounds were identified of the first period and 40 compounds were identified of the second period. They were showed that the technology of supercritical carbon dioxide(SC-CO-2) extraction can significantly increase the yield and the quality of bergamot essential oil. The main components of fresh bergamot oil was butanediol (16.28% ) and dried bergamot oil was coumarin, 5,7-dimethoxy-((19.49%)). The rate of inside long chain fatty acids of dried bergamot oil was 26.47% at second period.