Bioactivity and toxicity of Bridelia micrantha, Chenopodium ambrosoides and Ocimum americanum plant extracts

Citation:
Osebe T, Mbaria J, Yole D, Odongo D, Nderitu J, Ochanda H. "Bioactivity and toxicity of Bridelia micrantha, Chenopodium ambrosoides and Ocimum americanum plant extracts." International Journal of Basic & Clinical Pharmacology. 2016;6(1):5-11.

Abstract:

Background: Bridelia micrantha, Chenopodium ambrosoides and Ocimum
americanum plant species are commonly used in traditional medicine for a
number of ailments. The extracts of these plants have been shown to have antischistosomal
activity suggesting that they could be used for the development of
new chemical entities (NCEs) for the treatment of schistosomiasis. However
there is limited knowledge on their toxicological profile and their use in
traditional medicine may not be a satisfactory safety indication.
Methods: In this study the extracts were first screened for bioactivity using
brine shrimp lethality test for the determination of LC50 followed by rodent
acute toxicity and 28 day subchronic studies.
Results: B. micrantha water extract with a LC50 of 77µg/ml was deemed toxic
while C. ambrosoides methanol and water extracts were moderately toxic with
LC50 of 104.63µg/ml and 696.44µg/ml respectively. O. americanum hexane
and water extracts toxicity varied from moderate to slightly toxic with LC50 of
887.59µg/ml and 2254.60µg/ml respectively. C. ambrosoides and O.
americanum water extracts which were preferentially selected for subsequent
studies were found to have mild to no irritation to rodent eyes and skin.
Moreover, the aminotransferases AST and ALT which were used to detect liver
injury suggested negligible effect.
Conclusions: This therefore confirms that C. ambrosoides and O. americanum
water extracts are safe for clinical use with O. americanum water extract having
a slight edge.
Keywords: Antihelminthic, Schistosomiasis, Toxicity

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