Abstract
PHYTOCHEMICAL SCREENING AND ANTIBACTERIAL ACTIVITY OF LEAF EXTRACT OF COMMELINA BENGHALENSIS L

*D. Sumithra and Dr. Sumithra Purushothaman

ABSTRACT

Plant secondary metabolites provide a vital role for the medicinal activity of plant species. The present investigation deals with qualitative screening of secondary metabolite and antimicrobial activity of Commelina benghalensis L. leaves extract belongs to family of Commelinaceae. 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 extract. 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 result of this proposed study enlightened the evidence that, Commelina benghalensis L. contains various bioactive compounds that may be useful in the synthesis of therapeutic drugs and also suggest the herbal medicine.

Keywords: Medicinal plants, Commelina benghalensis L., secondary metabolites.


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