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[Study of chemical constituents of the essential oil from Inula britannica L. by GC-MS].

OBJECTIVE
The chemical components of the essential oil from Inula britannica L., which were collected from Yuncheng area of Shanxi province, were analyzed by GC-MS.


METHODS
The essential oil was extracted from Inula britannica L. by steam distillation, the components were separated with the capillary chromatographic columns, the amount of the components from the essential oil was determined by normalization method. The components separated were identified by data search system. The chromatographic conditions were as follows: DB-5 (30m x 0.25mm, 0.25 microm) capillary column; High purity helium was used as carrier gas, and the flow rate was 1.0 ml/min; Column temperature: 70 degrees C keeping 2min, from 70 degrees C to 230 degrees C at rising rate 10 degrees C/min and keeping 10 min; Split ratio 15:1; Injector temperature 250 degrees C.


RESULTS
62 peaks were identified representing 68.4% of the total contents. Main component was 1-Benzoxepin-3-ol,2,3,4,5-tetrahydro-(4. 276% ).


CONCLUSION
The method is so reliable, stable, and good reproducible that can be applied to the analysis of the essential oil from Inula britannica L.