Investigating the impact of organic matter on Vibrio parahaemolyticus inactivation in aquaculture water by UV-LED system
Issued Date
2025-05-01
Resource Type
ISSN
03014797
eISSN
10958630
Scopus ID
2-s2.0-105001715069
Journal Title
Journal of Environmental Management
Volume
381
Rights Holder(s)
SCOPUS
Bibliographic Citation
Journal of Environmental Management Vol.381 (2025)
Suggested Citation
Thanajiradech P., Suyamud B., Duchda P., Lohwacharin J., Larpparisudthi O.a. Investigating the impact of organic matter on Vibrio parahaemolyticus inactivation in aquaculture water by UV-LED system. Journal of Environmental Management Vol.381 (2025). doi:10.1016/j.jenvman.2025.125237 Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/109470
Title
Investigating the impact of organic matter on Vibrio parahaemolyticus inactivation in aquaculture water by UV-LED system
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Corresponding Author(s)
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Abstract
Ultraviolet (UV) irradiation becomes a promising technology in inactivating pathogenic microbes, but the compositional change of organics and its consequence of inactivation need further study in raw water during UV light-emitting diode (UV-LED) irradiation. Herein, the bench-scale study aimed at evaluating the effect of organic fractions isolated from shrimp-farming water on the inactivation efficiency of Vibrio parahaemolyticus using UV-LED process at wavelengths of 265 nm, 280 nm, and combined wavelengths. The lowest required UV fluence (4.06 mJ/cm2) for 3-log inactivation was attained with UV-LED 280 nm. After UV irradiation the changes in elemental compositions of organic compounds, based on H/C and O/C ratios, were small. This is probably due to low UV exposure and UV resistant structure of organic constituents, predominantly lipid-like compounds. Contrarily, fluorescent spectroscopic analysis that showed degradation of protein-like substances by UV irradiation. In addition, the significant declines in the number of chemical formulas in organic compounds were identified through non-target screening using orbitrap mass spectrometry, suggesting degradation and amalgamation into new compounds. The presence of organic compounds did not profoundly affect inactivation efficiency at applying a minimum required fluence or greater. This study highlights the potential of UV-LED irradiation, particularly at 280 nm, for efficient inactivation of V. parahaemolyticus and subsequent molecular structure alteration of organic matter after UV irradiation.