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

Ofelia C. Romero-Maraccini, Nora J. Sadik, Sahid L. Rosado-Lausell, Charles R. Pugh, Xi-Zhi Niu, Jean-Philippe Croue, Thanh Ha Nguyen

Research output: Contribution to journalArticlepeer-review

29 Scopus citations


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. © 2013 American Chemical Society.
Original languageEnglish (US)
Pages (from-to)11004-11012
Number of pages9
JournalEnvironmental Science & Technology
Issue number19
StatePublished - Sep 16 2013

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: We acknowledge the financial support of the Academic Excellence Alliance (AEA) program at King Abdullah University of Science and Technology (KAUST), NSF CAREER grant to T.H.N. (0954501), and NSF GRF DGE 07-15088 FLW to O.C.R. We thank Leonardo Gutierrez for helping with experiments and Dr. Joanna Shisler and Peter A. Maraccini for insightful discussion.

ASJC Scopus subject areas

  • Environmental Chemistry
  • General Chemistry


Dive into the research topics of 'Sunlight-induced inactivation of human Wa and porcine OSU rotaviruses in the presence of exogenous photosensitizers'. Together they form a unique fingerprint.

Cite this