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Antinociceptive and anti-inflammatory effects of the essential oil from Eremanthus erythropappus leaves.
Journal of Pharmacy and Pharmacology 2008 June
The chemical composition of the essential oil from air-dried leaves of Eremanthus erythropappus was studied. The main compounds were beta-pinene (23.24%), beta-caryophyllene (22.92%), beta-myrcene (10.03%) and germacrene D (9.40%). The essential oil had an LD50 of 2.90 g kg(-1) in mice. Doses of 200 and 400 mg kg(-1) inhibited 10.69% and 27.06% of acetic-acid-induced writhing in mice, respectively. In the formalin-induced nociception test in mice, the essential oil inhibited the first phase of paw licking by 29.13% (400 mg kg(-1)) and the second phase by 32.74% (200 mg kg(-1)) and 37.55% (400 mg kg(-1)). In the hot-plate test in mice, doses of 200 mg kg(-1) and 400 mg kg(-1) significantly increased the reaction time after 30, 60 and 90 min of treatment. Doses of 200 and 400 mg kg(-1) inhibited carrageenan-induced paw oedema in rats by 15.18% and 36.61%, respectively. Doses of 200 and 400 mg kg(-1) administered 4 h before intrapleural injection of carrageenan significantly reduced exudate volume (by 20.20% and 48.70%, respectively) and leucocyte mobilization (by 5.88% and 17.29%, respectively). These results demonstrate that E. erythropappus has analgesic and anti-inflammatory properties, supporting the use of this plant in folk medicine.
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