Identification of difurocumenonol, a new antimicrobial compound from mango ginger (Curcuma amada Roxb.) rhizome

• Published in: Journal of applied microbiology 2007-06, Vol.102 (6), p.1594-1602
• Main Authors: Policegoudra, R.S., Divakar, S., Aradhya, S.M.
• Format: Article
• Language: English
• Subjects: Anti-Bacterial Agents - isolation & purification; antibacterial activity; bactericidal; Benzofurans - chemistry; Benzofurans - isolation & purification; Biological and medical sciences; Chloroform; Curcuma; Curcuma - chemistry; Curcuma amada; Cyclodecanes - chemistry; Cyclodecanes - isolation & purification; difurocumenonol; Fundamental and applied biological sciences. Psychology; Gram-Negative Bacteria - drug effects; Gram-Positive Bacteria - drug effects; Mangifera indica; mango ginger; MIC; Microbial Sensitivity Tests - methods; Microbiology; Nuclear Magnetic Resonance, Biomolecular - methods; rhizome; Rhizome - chemistry; Spectrometry, Mass, Electrospray Ionization - methods; Spectrophotometry, Ultraviolet - methods; Spectrum Analysis - methods
• ISSN: 1364-5072; 1365-2672
• DOI: 10.1111/j.1365-2672.2006.03186.x

Aim:  The aim of the present work was to purify and characterize potential natural antibacterial compound from mango ginger (Curcuma amada Roxb.) rhizome. Methods and Results:  The mango ginger rhizome powder was sequentially extracted and screened for antibacterial activity by agar well diffusion method and broth dilution method. Nonpolar extracts of mango ginger showed high antibacterial activity against gram‐positive bacteria with low minimum inhibitory concentration (60–180 ppm). Among five extracts of mango ginger, the chloroform extract demonstrated highest antibacterial activity. Antibacterial activity‐guided fractionation of the chloroform extract by repeated silica gel column chromatography yielded pure compound. The purified antibacterial compound was analysed by UV, IR, LC‐MS and 2D‐HMQCT NMR spectra and was identified as a difurocumenonol, a novel compound not reported previously. Conclusions:  Mango ginger extracts and isolated difurocumenonol demonstrated high antibacterial activity against gram‐negative and gram‐positive bacteria. Significance and Impact of the Study:  A novel and natural antibacterial compound as well as mango ginger extracts can be used as food preservative to control the growth of food‐borne pathogens and as a source of mango flavour.