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Toxicological studies and bioactivity-guided identification of antimicrobially active compounds from crude aqueous stem bark extract of . | LitMetric
Objective : The main objective of this study is to isolate, identify, and quantify the active antimicrobial compounds present in the crude aqueous stem bark extract of using some common pathogenic microorganisms as well as toxicological profile.Material And Methods : Crude aqueous stem bark extract of (CASEB) was partitioned by preparative thin layer chromatography (PTLC) using chloroform-methanol-water, 8:2:1 (v/v). The resulting bands were extracted using chloroform-methanol (50:50). The extract of each band was evaluated for antimicrobial activity on , , , , , , , , and by disc diffusion. Compounds in the most antimicrobially bioactive fraction (MAAF) were identified by high performance liquid chromatography (HPLC), Fourier transform infrared spectrophotometry (FT-IR), and gas chromatography-mass spectrometry (GC-MS). Toxicological profile of the CASEB was evaluated by studying its effect in albino Wister rats.Results : PTLC produced five bands/fractions of which the MAAF was identified as RF-fraction being active against all the isolates except and HPLC of the MAAF revealed seven components; FT-IR revealed 17 functional groups; GC-MS revealed five compounds of which 93.18% are Oleic acid (44.88%), Squalene (34.16%), and n-Hexadecanoic acid (14.14%). The acute toxicity showed LD > 3,000 mg/kg. Sub-chronic toxicity showed that higher doses of the CASEB caused significant changes in liver function indices and a fatty change with lymphocytic infiltration (sign of acute hepatitis) in the liver tissues, but none of these changes were observed in the kidneys.Conclusion : The antimicrobially active compounds in CASEB were Oleic acid, Squalene, and n-Hexadecanoic acid. These can be further purified and used as precursors of new antimicrobial agents for treating infections especially those due to fungi and spp. that are known to resist wide array of antimicrobial agents. The LD of CASEB is >3,000 mg/kg in rats. However, long-term consumption of CASEB is associated with significant liver damage.
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