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    Synergistic antimicrobial activity of galangal (Alpinia galanga), rosemary (Rosmarinus officinalis) and lemon iron bark (Eucalyptus staigerana) extracts

    Access Status
    Fulltext not available
    Authors
    Weerakkody, N.
    Caffin, N.
    Lambert, L.
    Turner, M.
    Dykes, Gary
    Date
    2011
    Type
    Journal Article
    
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    Citation
    Weerakkody, N. and Caffin, N. and Lambert, L. and Turner, M. and Dykes, G. 2011. Synergistic antimicrobial activity of galangal (Alpinia galanga), rosemary (Rosmarinus officinalis) and lemon iron bark (Eucalyptus staigerana) extracts. Journal of the Science of Food and Agriculture. 91 (3): pp. 461-468.
    Source Title
    Journal of the Science of Food and Agriculture
    DOI
    10.1002/jsfa.4206
    ISSN
    0022-5142
    School
    School of Public Health
    URI
    http://hdl.handle.net/20.500.11937/36461
    Collection
    • Curtin Research Publications
    Abstract

    BACKGROUND: In this study the synergistic antimicrobial activities of combinations of extracts from galangal (Alpinia galanga), rosemary (Rosmarinus officinalis) and lemon iron bark (Eucalyptus staigerana) were evaluated against Staphylococcus aureus, Listeria monocytogenes, Escherichia coli, Salmonella typhimurium and Clostridium perfringens. Chemical compositions of these extracts were also determined to provide further insight into antimicrobial constituents and their potential mechanisms of action. RESULTS: Combinations of galangal with either rosemary or lemon iron bark showed synergistic antimicrobial activity. Specifically, galangal and rosemary showed synergistic activity against S. aureus and L. monocytogenes only, while galangal and lemon iron bark showed synergistic activity against E. coli and S. typhimurium. Chemical compositions of the extracts were determined by gas chromatographic–mass spectrometric analysis. The major chemical components of the galangal and lemon iron bark extracts were 1′-acetoxy-chavicol acetate (1′ACA) (63.4%) and neral (15.6%), respectively, while 1,8-cineole (26.3%) and camphor (20.3%) were identified as major chemical components of the rosemary extract. CONCLUSION: The results of this study show that galangal, rosemary and lemon iron bark extracts contain components that may have different modes of antimicrobial action and combinations of these extracts may have potential as natural antimicrobials to preserve foods.

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