[GC-MS analysis and analgesic activity of essential oil from fresh rhizoma of Cyperus rotundus].

Objective: To observe the analgesic effect and analysis the chemical components of essential oil (EOC) from fresh rhizome of Cyperus rotundus.

Methods: Hydrodistillation method was used to extract EOC; Acetic acid induced mice stretching model was applied to evaluate the analgesic effect of EOC. Gas chromatography coupled with mass spectrometry (GC-MS) were applied for the analysis of EOC.