Anthelmintic activities of Polyalthia longifolia leaf and stem bark extracts in Heligmosimoides bakeri infected mice

Polyalthia longifolia is used traditionally to manage intestinal worm infections. In this study, the anthelmintic activities of the leaf and stem bark extracts were evaluated in Heligmosimoides bakeri infected mice. Extracts were first subjected to phytochemical and acute toxicity (LD50) tests. For the anthelmintic study, in vivo and in vitro models were adopted. In the in vivo study, groups 3 – 6 of infected mice were assigned specific extract treatments, while groups 1, 2 and 7 were the normal, negative and standard (albendazole treated) groups respectively. Egg count was determined every 3 days during treatment. In the in vitro model, the extracts were applied to the worms in  Petri dishes before larvae counts. Results obtained showed the presence of significant amounts of alkaloids, flavonoids, tannins, steroids, terpenes, saponins, cardiac glycosides and phenols in both extracts with LD50 values >5000 mg/kg body weight for both extracts. Result of the in vivo anthelmintic study showed significant fall in egg/larval count in all groups treated with the extracts (p<0.05), as 400 and 800 mg/kg of the leaf extract lowered egg count to 0.60 ± 0.24 and 0.20 ± 0.20 respectively while same doses of the stem bark extract lowered egg count to 0.40 ± 0.24 and 0.20 ± 0.20 respectively, when compared with the negative control group which had a count of 297.80 ± 13.18. Results obtained in the in vitro model also indicated significant vermicidal effect for both extracts. We therefore conclude that P. longifolia may be potential sources of vermicidal agent