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    Biofilm inhibiting activity of betacyanins from red pitahaya (Hylocereus polyrhizus) and red spinach (Amaranthus dubius) against Staphylococcus aureus and Pseudomonas aeruginosa biofilms

    Access Status
    Fulltext not available
    Authors
    Yong, Y.
    Dykes, Gary
    Lee, S.
    Choo, W.
    Date
    2018
    Type
    Journal Article
    
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    Citation
    Yong, Y. and Dykes, G. and Lee, S. and Choo, W. 2018. Biofilm inhibiting activity of betacyanins from red pitahaya (Hylocereus polyrhizus) and red spinach (Amaranthus dubius) against Staphylococcus aureus and Pseudomonas aeruginosa biofilms. Journal of Applied Microbiology.
    Source Title
    Journal of Applied Microbiology
    DOI
    10.1111/jam.14091
    ISSN
    1364-5072
    School
    School of Public Health
    URI
    http://hdl.handle.net/20.500.11937/72252
    Collection
    • Curtin Research Publications
    Abstract

    © 2018 The Society for Applied Microbiology Aims: To investigate the biofilm inhibitory activity of betacyanins from red pitahaya (Hylocereus polyrhizus) and red spinach (Amaranthus dubius) against Staphylococcus aureus and Pseudomonas aeruginosa biofilms. Methods and Results: The pulp of red pitahaya and the leaves of red spinach were extracted using methanol followed by subfractionation to obtain betacyanin fraction. The anti-biofilm activity was examined using broth microdilution assay on polystyrene surfaces and expressed as minimum biofilm inhibitory concentration (MBIC). The betacyanin fraction from red spinach showed better anti-biofilm activity (MBIC: 0·313–1·25 mg ml-1) against five Staph. aureus strains while the betacyanin fraction from red pitahaya showed better anti-biofilm activity (MBIC: 0·313–0·625 mg ml-1) against four P. aeruginosa strains. Both betacyanin fraction significantly reduced hydrophobicity of Staph. aureus and P. aeruginosa strains. Numbers of Staph. aureus and P. aeruginosa attached to polystyrene were also reduced without affecting their cell viability. Conclusion: Betacyanins can act as anti-biofilm agents against the initial step of biofilm formation, particularly on a hydrophobic surface like polystyrene. Significance and Impact of the Study: This study is the first to investigate the use of betacyanin as a biofilm inhibitory agent. Betacyanin could potentially be used to reduce the risk of biofilm-associated infections.

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    • Comparative Study of Betacyanin Profile and Antimicrobial Activity of Red Pitahaya (Hylocereus polyrhizus) and Red Spinach (Amaranthus dubius)
      Yong, Y.; Dykes, Gary; Lee, S.; Choo, W. (2016)
      Betacyanins are reddish to violet pigments that can be found in red pitahaya (Hylocereus polyrhizus) and red spinach (Amaranthus dubius). This study investigated the impact of sub-fractionation (solvent partitioning) on ...
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      Yong, Y.; Dykes, Gary; Lee, S.; Choo, W. (2018)
      © 2018 Elsevier Ltd Red pitahaya fruit is rich in purplish-red color water-soluble betacyanins. The effect of refrigerated storage at 4 °C on the betacyanin composition of red pitahaya was monitored each day, for one week, ...
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