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Hypoglycemic effects of the aqueous extract of African Mistletoe, Tapinanthus sesselifolius (P. Beauv) van Tiegh (Loranthaceae)
Abstract
The hypoglycemic effect of the aqueous extract of African mistletoe, Tapinanthus sesselifolius, was investigated in-vivo and in-vitro. Studies were carried out on normoglycemic and alloxan-induced hyperglycemic rabbits, and glucose uptake studies were done using the isolated intestine of normal rabbits. The safety studies (acute toxicity test) were carried out in mice. The results revealed that the aqueous extract of Tapinanthus sesselifolius exhibited transient reduction of blood glucose in normoglycemic rabbits and significantly lowered blood glucose level in hyperglycemic rabbits. The extract significantly decreased the level of glucose in serosal fluid dose dependently. The intraperitoneal (i.p.) LD50 of Tapinanthus sesselifolius was found to be 2000 – 2650 mg/kg within 95% confidence limits. The preliminary phytochemical screening showed positive test for biologically active substances such as saponins, tannins, flavonoids, terpenoids and glycosides. The data showed that Tapinanthus sesselifolius contain biologically active substances that may be useful in treatment of diabetes and thus gave a scientific basis for its use in herbal traditional medicine as an antidiabetic agent.
Keywords: Phytomedicine, alloxan-induced hyperglycemia, glucose uptake
