Toxicity Studies of the Extracts of Parkia biglobosa Stem Bark in Rats
M. I. Builders, C. O. Isichie, J. C. Aguiyi
Journal of Pharmaceutical Research International · pp. 1–16 · Published 17 Jan 2012
10.9734/BJPR/2012/906Abstract
Extracts of Parkia biglobosa stem bark is used in Nigerian traditional medicine (NTM) to treat malaria, diarrhea and pains. To establish the toxicity profile of the medicine such parameters as the lethal dose (LD50) as well as effects on body functions and organs were evaluated in albino Wistar rats. The bioactive constituents of the water and methanol extracts were also evaluated as a link to toxicity. The LD50 was greater than 5000mg/kg per oral (p.o) for both extracts. No significant (P<0.05) changes in body weights and vital organs of treated animals. However, at 5000mg/kg of water extract, a significant increase in relative weight of the kidneys and hyper -cholesterolemic effects were observed. The extract also elicited significant increase in blood glucose level. The kidneys and livers of animals treated with P. biglobosa water extract for 14 days revealed histopathological evidence of pathological lesions. The methanol extract did not show any changes in the levels of hepatic and hematological parameters, histopathological evidence of pathological lesions, and serum level of urea, uric acid, bilirubin, creatinine and total protein concentrations. Treatment elicited hypo -cholesterolemic effects and significant reduction in blood glucose level occurred in all the groups. The phytochemical screening revealed the presence of tannins, flavonoids, saponins, terpenes, cardiac glycosides, phenols and reducing sugars in the methanol extract, the water extract showed the presence of similar constituents with the absence of flavonoids and cardiac glycosides. This study has shown the toxicity characteristics of the methanol and water extracts of the stem bark P. biglobosa in short time treatment with the extracts.
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