Isolation of antibacterial compounds from Quercus dilatata L. through bioassay guided fractionation

Annals of Clinical Microbiology and Antimicrobials

Research

Maryam Jamil¹  Bushra Mirza¹  Ihsan ul Haq²  Mazhar Qayyum³ 

[1] Department of Biochemistry, Quaid i Azam University, Islamabad, Pakistan;Department of Pharmacy, Quaid i Azam University, Islamabad, Pakistan;PMAS Arid Agriculture University, Rawalpindi, Pakistan;

关键词: Absorption spectrum;    Antibacterial activity;    Phytochemical analysis;    RP-HPLC analysis;    Solvent partitioning;   

DOI  :  10.1186/1476-0711-11-11

 received in 2012-01-21, accepted in 2012-05-03,  发布年份 2012

来源: Springer

【 摘 要 】

BackgroundFour medicinal plants (Chrozophora hierosolymitana Spreng, Chrysanthemum leucanthemum L., Ephedra gerardiana Wall. ex Stapf, and Quercus dilatata L.) used by indigenous healers to treat various infectious diseases were selected for the present study. The major objective of the present study was isolation and characterization of antimicrobial components from the crude plant extracts using bioassay guided fractionation.MethodsSeven methanolic extracts of the four plants were screened to identify any antimicrobial agents present in them. The active crude plant extract was fractionated first by solvent partitioning and then by HPLC. Characterization of the active fractions was done by using spectrophotometer.ResultsAll the seven methanolic extracts showed low antifungal activity, however, when these extracts were tested for antibacterial activity, significant activity was exhibited by two extracts. The extract of aerial parts of Q. dilatata was most active and therefore, was selected for further analysis. Initially fractionation was done by solvent-solvent partitioning and out of six partitioned fractions, ethanol fraction was selected on the basis of results of antibacterial activity and phytochemical analysis. Further, fractionation was carried out by RP- HPLC and purified active subfractions were characterized by comparing their absorption spectra with that of the known natural products isolated from the plants of Quercus genus.Discussion and conclusionThe results suggest that this is the first report of the isolated antibacterial compounds from this genus.

【 授权许可】

Unknown   
© Jamil et al.; licensee BioMed Central Ltd. 2012. This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.