Résumé
The methanol stem bark extract of Neocarya macrophylla was screened for its analgesic activity using acetic acid-induced writhing in mice and formalin-induced pain in rats. The results of the study showed that the extract (60mg/kg, i.p.) decreased writhing response with 63.9% inhibition. The methanol extract also exhibited significant analgesic effect (P<0.05) in the formalin test which is in the same order of magnitude as that observed after administration of pentazocine (10mg/kg, i.p.) the standard drug. The intraperitoneal median lethal dose (LD50) of the methanol extract of N. macrophylla was found to be 283mg/kg in mice suggesting the plant is fairly toxic. The results of the study have shown that the methanol extract of N. macrophylla possesses analgesic activity which rationalizes the traditional use of the plant in the management of pain.
Résumé
Phytochemical screening was carried out on the ethylacetate portion of the ethanolic extract of the leaves of Pseudocedrella kotschyii and then evaluated for its analgesic (acetic acid-induced writhing) and anti-inflammatory (raw egg albumin-induced oedema) activities in mice and rats respectively. Phytochemical screening of the ethylacetate partition portion of ethanolic extract revealed the presence of flavonoids; glycosides and tannins as major chemical constituents. Alkaloids saponins; cardiac glycosides; steroids were not dictated in the extract. The ethylacetate extract (50 and 100 mg/kg i.p) exhibited significant activity (p0.05) against acetic acid-induced writhing in a dose dependent manner. In the anti-inflammatory activity the ethylacetate extract (50 and 100 mg/kg i.p.) caused a slight effect against the raw egg albumin-induced oedema. The effect was however observed not to be dose dependent. All these effects were compared with standard drug piroxicam (20 mg/kg i.p.)