Studies on Phytochemical Profile and Antibacterial Activity of Ethanolic Leaf Extract of Tabebuia rosea (Bertol.) DC.

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Vol: 2008, Issue: 1

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Sathiya, M.; Muthuchelian, K.
article description
Tabebuia rosea (Bertol.) DC. is commonly grown as an ornamental tree for its grand and majestic pink or purple flowers which offer different shades of colours. The wood is valuable and used in the manufacture of furniture. The preliminary phytochemical screening of the leaves revealed the presence of saponins, tannins, phenolic acids, flavonoids and alkaloids. In vitro antibacterial studies on the ethanolic leaf extracts were carried out on ten medically important bacterial strains, including Salmonella typimurium, Pseudomonas aeruginosa, Klebsiella pneumonia, Escherichia coli, Psudomonas sp., Staphylococcus epidermis, Micrococcus luteus, Staphylococcus aureus, Streptococccus sp. and Bacillus subtilis, which were procured from the Microbial Type Cultrue and Collection, Chandigarh, India, using agar disc diffusion method. The bacterial strains were exposed to the following four different concentrations of extracts: 50 mg/ml, 100 mg/ml, 200 mg/ml and 300 mg/ml solvent. The results of our antibacterial assay revealed that the extract showed good inhibitory activity against all the tested pathogens compared with standard antibiotics like streptomycin and penicillin. The inhibitory activities were found to be dose dependent.