| In the present study,essential oils extracted from Dracocephalum tanguticum Maxim.,a labiatae plant in Qinghai-Tibet Plateau,and Artemisia selengensis Turcz.,a composite plant in Dongting region,were analyzed by gas chromatography-mass spectrometry(GC-MS).The volatile components from the plants were identified with the help of the normal mass spectral data(NIST98 database).The relative contents of volatile components were calculated by the peak area normalization method.1.Study of essential oils in Dracocephalum tanguticum Maxim.Extraction:Steam distillation(SD)and carbon dioxide supercritical fluid extraction(SFE-CO2)were adopted.Conclusions:66 compounds were identified in the essential oil obtained by SD,which occupied 76.581%in all essential oils.The major compounds are Eucalyptol(18.080%),Bicyclo[3.1.1]heptan-3-one,2,6,6-trimethyl-, (1.alpha.,2.alpha.,5.alpha.)-(8.794%),Cyclopentane,methyl-(4.222%), 1,6-Octadien-3-ol,3,7-dimethyl-(3.683%),2-Cyclohexen- 1-ol, 4-methyl-1-(1-methylethyl)-,(R)-(3.052%),(+)-alpha.-Terpineol(2.579%), Benzene,1-methyl-4-(1-methylethyl)-(2.559%),Bicyclo[3.1.1]heptane, 6,6-dimethyl-2-methylene,(1S)-(2.483%),3,7-Cyclodecadien-1-one, 10-(1-methylethylidene)-,(E,E)-(2.349%),(-)-Spathulenol(2.183%), Bicyclo[3.1.1]hept-3-en-2-ol,4,6,6-trimethyl-,(1alpha.,2alpha.,5alpha.)-(2.150%)。38 compounds were identified in the essential oil obtained by SFE-CO2, which occupied 42.857%in all essential oils.The major compounds are Eucalyptol(4.909%),Bicyclo[3.1.1]heptan-3-one,2,6,6-trimethyl-, (1.alpha.,2.alpha.,5.alpha.)-(4.895%),3,7-Cyclodecadiene-1-methanol,.al pha.,.alpha.,4,8-tetramethyl-(4.523%),1,6-Dimethyl-9-(1-methylethyliden e)-5,12-dioxatricyclo[9.1.0.0(4,6)]dodecan-8-one(4.287%),3,7-Cyclodeca dien-1-one,3,7-dimethyl-10-(1-methylethylidene)-,(E,E)-(3.973%),(-)-Sp athulenol(2.499%),Germacrene D(2.030%),Z-.beta.-Ter- pineol (2.029%).2.Study of essential oil in wild Artemisia selengensis Turcz.Extraction:Steam distillation was adopted.Conclusions:48 compounds were identified in the essential oil of wild Artemisia selengensis Turcz.,which occupied 72.116%in all essential oils.The major compounds are.alpha.-Caryophyllene(15.734%), Caryophyllene(13.246%),Cyclohexane,1-ethenyl-1-methyl-2-(1-methyl-ethenyl)-4-(1-methylethylidene)-(9.511%), 1,6,10-Dodecatriene,7,11-dime thyl-3-methylene-,(E)-(5.267%),1(2H)- Naphthalenone,octahydre-4a,8a-dimethyl-7(1-methylethyl)-, (4.184%),E,Z-2,13-Octadecadien 1-ol (4.126%),.alpha.-bisabolol(2.950%),Bicyclo[2.2.1]hextan-2-ol,1,7,7- trimethyl-,acetate,(1S-endo)-(2.845%),Germacrene D(2.803%)。3.Comparison of compounds in the essential oils between wild Artemisia selengensis Turcz and artificial planted Artemisia selengensis Turcz.40,49,42,42 compounds were identified in the essential oils of four samples of artificial planted Artemisia selengensis Turcz.,which occupied 45.356%,46.331%,50.593%,44.089%in all essential oils.The major compounds are Santolina triene(10.484～13.535%),.alpha.-Pinene (7.645～9.897%),9,12- Octadecanoic acid(Z,Z)-(0.375～5.969%),1,6,10-Dodecatriene, 7,11- dimethyl-3-methylene-,(E)-(2.250～4.537%), Cyclohexane,1-ethenyl-1- methyl-2-(1-methylethenyl)-4-(1-methyl-ethylidene)-(3.233～4.398%), beta.-Phellandrene(2.893～3.568%), Caryophyllene(1.854～3.159%),alpha.-Caryophyllene(1.183～1.884%).There are dramatic differences on the components of essential oils between wild and artificial planted Artemisia selengensis Turcz.Only 20 components are same in the wild and the artificial plant,and there are significantly differences in the relative contents.In the essential oil of wild plant,sesquiterpenes and their derivates are major components. Their total content is 58.154%.The total content of monoterpenoids and their derivates is 7.136%.In the essential oil of artificial planted plant, monoterpenoids and their derivates are major components.Their total content of monoterpenoids and their derivates is 25.126～31.548%. The total content of sesquiterpenes and their derivates is 11.759～15.453%. |
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