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A Bioassay-Guided Fractionation Scheme for Characterization of New Antibacterial Compounds From Prosopis Cineraria Aerial Parts



Neghabihajiagha M1 ; Aliahmadi A2 ; Taheri MR3 ; Ghassempour A3 ; Irajian G4 ; Rezadoost H3 ; Feizabadi MM1
Authors

Source: Iranian Journal of Microbiology Published:2016

Abstract

Background and Objectives:Due to the importance of finding of new antibacterial agents, the antibacterial properties of Prosopis cinerariaaerial parts were investigated using a bioassay guided fractionation scheme. Materials and Methods:The organic extract was prepared via maceration in methanol, followed by the fractionation using n-hexane and ethyl acetate. The MICs of fractions were determined against some human pathogenic bacteria using broth micro-dilution assay. The primary characterization and identification of bioactive substance(s) was based on a bio-autograph- ical method using HPTLC and flash chromatography in parallel with agar overlay assays. Finally the exact mass of effective compound(s) was determined by LC-MS. Results:The best antibacterial activities were related to the ethyl acetate fraction. The effective antibacterial compound of the plant were 2 substances with molecular weight of 348 and 184 Dalton that inhibited the growth of assessed Gram positive bacteria with MIC values lower than 125 to 62.5 µg/ml synergistically. Conclusion: Further analysis using nuclear magnetic resonance could reveal the exact structure of these two antibacterial substances. These 2 effective antibacterial compounds could be applied as lead compound for synthesis of new antibacterial agents. © 2016, Tehran University of Medical Science. All Rights reserved.
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