Antibacterial activity of leaves of Lagerstroemia speciosa (L) pers.

Antibacterial activity of ethanol and water extracts of leaves of Lagerstroemia speciosa (L) pers. were tested cup-plate agar diffusion method against Gram positive and Gram negative bacteria. It was observed that all extracts have inhibitory effect, water extract being most effective. 1 .It is commonly called as Banaba. The leaves of Lagerstroemia speciosa are purgative, deobstructive and diuretic. A decoction of the leaves prepared like tea is used for diabetes mellitus in Phillippines 2 . The preliminary phytochemcial studies reveal the presence of tannins, triterpenoids, proteins and aminoacid. Tannins may serve as lead compounds for the development of new therapeutic agent with antibacterial activity. The literature study revealed that the different extracts of the seeds have been shown to possess antimicrobial properties against Gram positive and Gram negative organisms 4 . But there are no reports on antimicrobial activity of the leaf extracts. Hence the present study was designed to investigate the antimi- crobial activity of extracts of Lagerstroemia speciosa Alcoholic and water extracts were tested against Staphylococcus aureus, Bacillus subtilis (Gram positive) and Psedomonas aeruginosa, Escherichia coli, (Gram negative bacteria). Ampicilin was used as the standard. MATERIALS & METHODS Plant material The fresh leaves Lagerstroemia speciosa (L) pers. Were collected from the local areas were authenticated by authority of Botany Department, Bangalore University. Extraction of plant material Leaves of Lagerstroemia speciosa (L) pers.were shade dried, pow- dered and extracted with ethanol in a soxhlet extractor and then by macera- tion with water for about 24hrs.the extract were concentrated in rotary vacuum evaporator and subjected to preliminary phytochemical investiga- tion 

Antibacterial activity of leaves of Lagerstroemia speciosa (L) pers.
corosolic acid