Determination of Antibacterial, Antifungal and Cytotoxic activities of n-Hexane, Chloroform and Ethyl Acetate extracts of Momordica charantia leaves
A study was conducted to determine the antibacterial and antifungal activities with minimum inhibitory concentration and cytotoxic activity of Momordica charantia (Family: Cucurbitaceae) leaves. In our present study, the antimicroial activity of n-hexane, chloroform and ethyl acetate fractions of the plant were investigated against a number of pathogenic Gram-positive (Bacillus megaterium, Bacillus subtilis, Staphylococcus aureus and Sarcina lutea), Gram- negative (Salmonella paratyphi, Salmonella typhi, Vibrio parahaemolyticus, Vibrio mimicus, Escherichia coli, Shigella dysenteriae, Shigella boydii and Pseudomonas aeruginosa) bacteria and three funguses (Candida albicans, Aspergillus niger and Saccharomyces cerevesiae). Here the zones of inhibitions for the test samples (500 µg /disc) were compared with that of reference standard (30 µg /disc) in determining antimicrobial activity. All the extracts showed significant antibacterial and antifungal activities against all the pathogenic bacteria except A. niger. The highest sensitivity for n-hexane, chloroform and ethyl acetate fractions was against gram positive bacteria B. cereus. Almost all the gram positive, gram negative bacteria and fungus were inhibited by ethyl acetate extract and showed better activity compared to n-hexane and chloroform extracts. All the three fractions were tested as antifungal against C. albicans and S. cerevesiae. They showed moderate activity against C. albicans whereas a very good activity against S. cerevesiae. But A. niger was not sensitive to the experimental extracts. Minimum inhibitory concentration (MIC) that is the lowest concentration at which the test sample shows its highest activity against microorganisms was tested by serial dilution method. The MIC for n-Hexane and chloroform extracts was against B. cereus (64 µg /ml). The ethyl acetate extract exhibited antibacterial activity with MIC of 64 µg /ml against S. aureus, S. luteae, S. boydii, S. dysentereae and V. mimicus. The Brine shrimp lethality bioassay method was used to determine the cytotoxic activity and vincristine sulphate was used as positive control. The LC50 values of standard vincristine sulphate, n-hexane, chloroform and ethyl acetate extract were 10.18 µg /ml, 24.71 µg /ml, 19.02 µg /ml and 30.38 µg/ml respectively which indicate the presence of bioactive compounds present in the plant extracts are promisingly cytotoxic.
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