Comparative Research on Celery Seed Essential Oils Prepared by Supercritical Fluid Extraction and Traditional Methods

Celery seed essential oils were extracted for tobacco casing by different methods including supercritical carbon dioxide fluid extraction(SFE-CO_2), simultaneous water distillation-solvent extraction(SDE) and organic solvent extraction(SE).The yield,chemical constituents,flavor character and effect on tobacco casing of these different celery seed essential oils were studied in comparison.Experimental results show that the yield of celery seed essential oil extracted by SFE is 11 .15%,close to that by SE(12 .80%) and much higher than that by SDE(0 .6%).There are 21 main volatile flavor chemical constituents in the celery seed oil made by SFE-CO_2,including sedanolide,eudesma-4,11-diene,limonene,1-(4-ethylphenyl)-ethanone, β -caryophyllene,myrcene, β -pinene, trans-p -mentha-2,8-dien-1-ol,caryophyllene oxide,ocimene,ethyl linalool, n -hexyl acetate,limonene oxide, trans -carveol, cis -carveol, trans -pinocarvyl acetate, trans -carvyl acetate, α -caryophyllene, β -selinene, β -elemene and dibutyl phthalate.They contribute 92 .98% of peak area of the volatile matters.The flavor of celery seed essential oil extracted by SFE-CO_2 is more natural and full-bodied,and the tobacco casing effect of it is better than that of other two oils made by SDE or SE.It can make the smoke smooth and sweet.