ANALGESIC, ANTI-INFLAMMATORY AND TOXICITY STUDIES ON METHANOLIC LEAF EXTRACT OF ROTHMANNIA LONGIFLORA SALISB (RUBIACEAE) IN RATS AND MICE
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ABSTRACT
The herbalists in several African Countries have used Rothmannia longiflora decoctions as febrifugal and analgesic agent. The present study examined the analgesic, anti-inflammatory and toxicological profile of the methanolic extract of the plant in experimental animals. The preliminary phytochemical screening of the methanolic leaf extract of R.longiflora was carried out and revealed the presence of cardiac glycoside, steroids/terpenoids, tannins, saponins, flavonoids and carbohydrates. The acute toxic effect (median lethal dose values (LD50) of methanolic leaf extract of Rothmannia longiflora was carried out using Lork’s method in intraperitoneal and oral routes in mice and rats and were found to be above 5000mg/kg body weight. The anti-nociceptive effects of the extract was studied using acetic acid induced writhing test in mice, hot plate test in mice and formalin induced pain in rats. The anti-inflammatory effect was studied using Carrageenan induced paw oedema in rats. The extract at doses of 50-1000mg/kg significantly (P0.05) of the levels of Sodium (Na+ ), Potassium (K+ ), Chloride (Cl- ) ions, Urea and Creatinine compared to that of the control at the end of 30 days (sub-chronic) and 90 days (chronic) studies. In liver function test, there was no statistically significant difference (P>0.05) in the levels of AST, ALT, and ALP enzymes in all the treated groups compared to the control group after the 30 days studies. However, there was statistically significant difference with 500mg/kg and 1000mg/kg after the 90 days treatment. The Histopathological study showed no observable gross lesions during the periods of subchronic and chronic studies. vii These findings suggest that methanolic leaf extract of R.longiflora possesses analgesic and anti-inflammatory potentials/effects that justify the ethnomedical use of the plant in the treatment of painful and inflammatory conditions by the herbal practitioners. In addition, the results of toxicity studies showed that the extract is non-toxic to the kidneys and the heart during the sub-chronic and chronic toxicity studies however; mild fatty change was observed with 500mg/kg in the liver after the chronic studies.
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