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    Sunlight-induced inactivation of human Wa and porcine OSU rotaviruses in the presence of exogenous photosensitizers

    Access Status
    Fulltext not available
    Authors
    Romero-Maraccini, O.
    Sadik, N.
    Rosado-Lausell, S.
    Pugh, C.
    Niu, X.
    Croué, Jean-Philippe
    Nguyen, T.
    Date
    2013
    Type
    Journal Article
    
    Metadata
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    Citation
    Romero-Maraccini, O. and Sadik, N. and Rosado-Lausell, S. and Pugh, C. and Niu, X. and Croué, J. and Nguyen, T. 2013. Sunlight-induced inactivation of human Wa and porcine OSU rotaviruses in the presence of exogenous photosensitizers. Environmental Science and Technology. 47 (19): pp. 11004-11012.
    Source Title
    Environmental Science and Technology
    DOI
    10.1021/es402285u
    ISSN
    0013-936X
    School
    Curtin Water Quality Research Centre
    URI
    http://hdl.handle.net/20.500.11937/49899
    Collection
    • Curtin Research Publications
    Abstract

    Human rotavirus Wa and porcine rotavirus OSU solutions were irradiated with simulated solar UV and visible light in the presence of different photosensitizers dissolved in buffered solutions. For human rotavirus, the exogenous effects were greater than the endogenous effects under irradiation with full spectrum and UVA and visible light at 25 C. For porcine rotavirus, the exogenous effects with UVA and visible light irradiation were only observed at high temperatures, >40 C. The results from dark experiments conducted at different temperatures suggest that porcine rotavirus has higher thermostability than human rotavirus. Concentrations of 3'-MAP excited triplet states of 1.8 fM and above resulted in significant human rotavirus inactivation. The measured excited triplet state concentrations of =0.45 fM produced by UVA and visible light irradiation of natural dissolved organic matter solutions were likely not directly responsible for rotavirus inactivation. Instead, the linear correlation for human rotavirus inactivation rate constant (kobs) with the phenol degradation rate constant (kexp) found in both 1 mM NaHCO3 and 1 mM phosphate-buffered solutions suggested that OH radical was a major reactive species for the exogenous inactivation of rotaviruses. Linear correlations between rotavirus kobs and specific UV254 nm absorbance of two river-dissolved organic matter and two effluent organic matter isolates indicated that organic matter aromaticity may help predict formation of radicals responsible for rotavirus inactivation. The results from this study also suggested that the differences in rotavirus strains should be considered when predicting solar inactivation of rotavirus in sunlit surface waters.

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