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Phytochemical screening and antibacterial activity of avicennia germinans

Subathra M and Uduman Mohideen A.M

Plants are a rich source of secondary metabolites with interesting biological activities. Avicennia germinans is a traditional medicinal plant and the leaves have tremendous medicinal values. The present investigation deals with qualitative screening of secondary metabolite and antimicrobial activity of A. germinans leaves extract belongs to family of Acanthaceae. Plant metabolites screenings were performed by using various solvents systems of varying polarity of acetone, ethanol and aqueous extracts. In this examination the crude extracts showed the presence of flavonoids, carbohydrates, saponins, phlobatannins, and volatile oil while Phenol, steroids and terpenoids were absent in all the solvents. Alkaloids present in acetone and ethanolic extracts. On the other hand tannins were absent only in acetone extracted. Anthroquinone was present in ethanolic and acetone extract. The ethanolic leaf extract was tested against Gram positive and Gram negative bacterial pathogens. Plant extract showed antibacterial activity against Escherichia coli, Bacillus subtilis, Staphylococcus aureus, Enterococcus faecalis while no inhibitory activity against Klepseilla pneumoniae. The medicinal property of A. germinans may be attributed to the presence of flavonoids and phenolic compounds with rich antioxidant potential. The therapeutic effect of this plant may be accounted for its counteracting action on free radicals in vivo.

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