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    Pharmacognosy Communications
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    Pharmacognosy Communications
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    Original Article

    Evaluating the Antimicrobial Potential of Eucalyptus baileyana F. Muell. and Eucalyptus major (Maiden) Blakely against the Fish Spoilage-causing Bacterium Shewanella putrefaciens

    wadmin1By wadmin1April 1, 2021Updated:August 5, 2021No Comments2 Mins Read
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    Mitchell Henry Wright1, Anthony Carlson Greene2, Ian Edwin Cock2,3,*
    1Leviathan Biosciences, Brisbane, Queensland, AUSTRALIA.
    2School of Environment and Science, Griffith University, Brisbane, Queensland, AUSTRALIA.
    3Environmental Futures Research Institute, Nathan Campus, Griffith University, Brisbane, Queensland, AUSTRALIA.

    Pharmacognosy Communications,2021,11,2,133-137.
    DOI:10.5530/pc.2021.2.24
    Published: April 2021
    Type: Original Article

    ABSTRACT

    Introduction: Eucalyptus baileyana (Bailey’s stringy bark) and Eucalyptus major (Queensland grey gum) have been previously used as antimicrobials against a variety of ailments. This study evaluated the effectiveness of E. baileyana and E. major as inhibitory agents against Shewanella putrefaciens, a bacterium widely associated with fish spoilage. Methodology: E. baileyana and E. major extracts were prepared using the leaves of each plant with methanol or water as the extraction solvent. Growth inhibition and minimal inhibitory concentrations were determined against S. putrefaciens through disc diffusion assays. MIC values were subsequently quantified to evaluate the extracts efficacies as antibacterial agents. Finally, the toxicity of each extract was determined using the Artemia franciscana nauplii bioassay. Results: E. baileyana aqueous and methanolic leaf extracts inhibited the growth of S. putrefaciens in the disc diffusion assay, with MIC values of 1411 and 1221 μg/mL respectively. Similarly, E. major leaf extracts also showed growth inhibition of S. putrefaciens, with MIC values of 1686 μg/mL for the aqueous extract, and 1160 μg/mL for the methanolic extract. However, toxicity studies of the extracts revealed that all extracts were toxic and likely unsuitable for human consumption (LC50 values 455-1146 μg/mL) as determined by the Artemia franciscana bioassay. Conclusion: While the E. baileyana and E. major leaf extracts were effective in preventing microbial growth, given their relatively high levels of toxicity, they would not be suitable for use as a preservative in the prevention of fish spoilage. However, the antibacterial capacity of the extracts indicates that the extracts may show promise as a surface disinfectant, and this should be investigated further.

    Key words: Fish spoilage, Shewanella putrefaciens, Eucalyptus major, Eucalyptus baileyana, Eucalypts, Medicinal plants.

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    About Journal
    About Journal

    Pharmacognosy Communications [Phcog Commn.] is a quarterly journal published by Phcog.Net. It is a peer reviewed journal aiming to publish high quality original research articles, methods, techniques and evaluation reports, critical reviews, short communications, commentaries and editorials of all aspects of medicinal plant research. The journal is aimed at a broad readership, publishing articles on all aspects of pharmacognosy, and related fields. The journal aims to increase understanding of pharmacognosy as well as to direct and foster further research through the dissemination of scientific information by the publication of manuscripts. The submission of original contributions in all areas of pharmacognosy are welcome.
    Indexed and Abstracted in : Chemical Abstracts, Excerpta Medica / EMBASE, Google Scholar, CABI Full Text, Ulrich’s International Periodical Directory, ProQuest, Journalseek & Genamics, PhcogBase, EBSCOHost, Academic Search Complete, Open J-Gate, SciACCESS.
    Rapid publication: Average time from submission to first decision is 30 days and from acceptance to In Press online publication is 45 days.
    Open Access Journal: Phcog Commn. is an open access journal, which allows authors to fund their article to be open access from publication.

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