Sunlight-induced inactivation of human Wa and porcine OSU rotaviruses in the presence of exogenous photosensitizers
AuthorsRomero-Maraccini, Ofelia C.
Sadik, Nora J.
Rosado-Lausell, Sahid L.
Pugh, Charles R.
Nguyen, Thanh Ha
KAUST DepartmentEnvironmental Science and Engineering Program
Biological and Environmental Sciences and Engineering (BESE) Division
Permanent link to this recordhttp://hdl.handle.net/10754/563024
MetadataShow full item record
AbstractHuman 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.
SponsorsWe 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.
PublisherAmerican Chemical Society (ACS)
- Role of temperature and Suwannee River natural organic matter on inactivation kinetics of rotavirus and bacteriophage MS2 by solar irradiation.
- Authors: Romero OC, Straub AP, Kohn T, Nguyen TH
- Issue date: 2011 Dec 15
- Inactivation Mechanisms of Human and Animal Rotaviruses by Solar UVA and Visible Light.
- Authors: Araud E, Shisler JL, Nguyen TH
- Issue date: 2018 May 15
- Roles of singlet oxygen and triplet excited state of dissolved organic matter formed by different organic matters in bacteriophage MS2 inactivation.
- Authors: Rosado-Lausell SL, Wang H, Gutiérrez L, Romero-Maraccini OC, Niu XZ, Gin KY, Croué JP, Nguyen TH
- Issue date: 2013 Sep 15
- Plasmon-induced inactivation of enteric pathogenic microorganisms with Ag-AgI/Al2O3 under visible-light irradiation.
- Authors: Hu X, Hu C, Peng T, Zhou X, Qu J
- Issue date: 2010 Sep 15
- Sunlight inactivation of somatic coliphage in the presence of natural organic matter.
- Authors: Sun CX, Kitajima M, Gin KY
- Issue date: 2016 Jan 15