RESUMO
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. RESULTS: The yield of EOC was 0.4%. The stretching times of mice induced by acetic acid were significantly reduced by EOC at dosage of 0.1 g/kg. 54 ingredients, 85.1% of which were EOC were identified by GC-MS analysis; The major compounds were cyperene (41.03%), beta-caryophyllene oxide (5.32%), alpha-selinene (4.37%), alpha-copaene (4.36%), naphthalene, 6-isoproenyl-4,8a-dimethyl-1, 2, 3, 5, 6, 7, 8, 8a-octahydro-(3.80%) and alpha-cyperone (3.11%). CONCLUSION: The essential oil from fresh rhizome of Cyperus rotundus shows structure diversity and good analgesic effect.
