Medicinal plants are in rich source of antimicrobial agents. The present study was carriedout to evaluate the antimicrobial effect of plants from the same species as Brassica oleceraceanamely, white cabbage and red cabbage. The preliminary phytochemical analysis was tested byusing a different extract of these plants for the presence of various secondary metabolites likealkaloids, flavonoids, tannins, saponins, terpenoids, glycosides, steroids, carbohydrates, and aminoacids. The in vitro antimicrobial activity was screened against clinical isolates viz gram positivebacteria Staphylococcus aureus, Streptococcus pyogenes, gram negative bacteria Escherichia coli,Pseudomonas aeruginosa. Extracts found significant inhibition against all the pathogens.
Preliminary phytochemical screening of the extracts revealed the presence of Carbohydrates, Steroids, Proteins, amino acids alkaloids, flavonoids, glycosides and tannins. The presence of these bioactive constituents is associated with the antimicrobial activity of the plant. The seed extract of Cucurbita pepo dissolved in alcoholic and hydroalcoholic solution showed the spectrum of inhibition on, Bacillus subtilis, and Escherichia coli by Cylinder plate method. The observations revealed significant zone of inhibition and supports to antibacterial activity.
Antimicrobial activity of different extracts of bark of Moringa oleifera was studied against ten bacterial strains These bacteria are both gram +ve and gram-ve. Bark were extracted with a petroleum ether, chloroform, ethyl acetate, ethanol and aqueous. In the present work the antibacterial activity was done by cup plate method. The antibacterial activity was expressed as zone diameter in millimeters. Different extracts from bark of the plant was compared with standards like benzyl penicillin for gram +ve bacteria and streptomycin for gram-ve bacteria using DMF as control. The readymade media for inoculum and culture was obtained from Himedia labs. Prepared herbal extracts from the bark of the plant were screened against bacteria organisms at the concentration range between 50 µg and 300 µg/0.1ml. The present investigation reveals that the aqueous, chloroform and ethyl acetate extracts and in some cases petroleum ether extract showed significant antimicrobial activity when compared with standard.
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