Isolation, Characterization, Pharmacological and Corrosion inhibition Studies of Flavonoids obtained from Nerium oleander and Tecoma stans

Air dried flowers of Nerium oleander and Tecoma stans have been investigated for their polyphenolics. The pigments have been found to myricetin and rutin respectively which were characterized by chromatography and spectral studies. These pigments were screened for their antibacterial and antifungal activity against different organisms. It was ascertained that the ethyl acetate fractions of flowers of both the plants are highly sensitive to staphylococcus aurcus, staphylococcus albus and klebsiella sp and moderately sensitive to pseudomonas and protecs sp. They were also found to be active antifungal agents against Candida albicans, Aspergillus niger. The extracts were also tried as corrosion inhibitors on mild steel and aluminium in 2M HCl at 30 ± 1C. It was found that the percentage of inhibition increases with the increase in volume / concentration of the extracts.