The presence of natural antioxidant and antimicrobial in plants is well known. This paper reports the antioxidative and antimicrobial activities of petroleum ether tabebuia rosea extracts. Petroleum ether extracts of tabebuia rosea flowers were evaluated for their free radical scavenging activity using the DPPH radical assay. Reduction of DPPH radicals can be observed by the decrease in the absorbance at λ max517nm. The tabebuia rosea flowers extract and ascorbic acid showed antioxidant activity with different IC50 values. The antimicrobial activity of tabebuia rosea flowers extract was done by using well diffusion method against different species of bacter.
Keywords: antioxidant activity, ascorbic acid, DPPH, free–radical assay, antimicrobial activity, well diffusion method.