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The mechanism of anti-diabetic activity of Gongronema latifolium was evaluated. The ethanol extract of the leaves of G. latifolium were fractionated using solvents of increasing polarity, namely n-hexane, chloroform, ethylacetate and ethanol. Phytochemical screening of the dried fractions were carried and then acute toxicity tests on mice carried out. The induction of diabetes mellitus was achieved with 150 mg/kg b.w for mild diabetes and 300 mg/kg b.w for the severe condition. The effects of the crude ethanol extract (CEE) and its fractions on alloxan-induced hyperglycaemia were monitored. The result obtained reveals that crude ethanol extract significantly and dose-dependently reduced hyperglycaemia. The fractions of the ethanol extract equally reduced hyperglycaemia but the level of reduction was affected by the phytochemical content. This suggests that an intact pancreas is required for the hypoglycaemic action which is the mechanism of action of the sulphonylureas. Keywords: Anti-diabetic, Gongronema latifolium , hyperglycaemia, hypoglycaemia, phytochemical screening. African Journal of Biotechnology , Vol 13(27) 2750-2754

Evaluation of hypoglycaemic activity of ethanol extract of Gongronema latifolium (Asclepiadaceae) leaves