Author(s): S Subhashini, SF Maleeka Begum, G Rajesh

Abstract: The present study was carried out to evaluate the bioactive components and to investigate the antimicrobial efficiency of different Quercus species namely Quercus suber, Quercus macrocarpa, Quercus montana, Quercus griffithii and Quercus serrata. The methanol is used as a solvent to evaluate the antimicrobial properties of the leaf and stem parts of the different Quercus species against certain bacterial and fungal species by disc diffusion method, and the spectrophotometric analysis is carried out to characterize the bioactive constituents present in the different plant samples. The results of the study revealed that the leaf and stem extracts of these samples possess good antimicrobial activity and the bioactive component, Gallic acid is found to found to be maximum in leaf and stem extracts of the five different Quercus species.