Photochemical fate and eco-genotoxicity assessment of the drug etodolac

The Science of the Total Environment
Monica PassanantiMarina Isidori

Abstract

The photochemical behavior of etodolac was investigated under various irradiation conditions. Kinetic data were obtained after irradiation of 10(-4) M aqueous solutions by UVB, UVA and direct exposure to sunlight. The Xenon lamp irradiation was used in order to determine the photodegradation quantum yield under sun-simulated condition (ϕsun). The value was determined to be=0.10±0.01. In order to obtain photoproducts and for mechanistic purposes, experiments were carried out on more concentrated solutions by exposure to sunlight and to UVA and UVB lamps. The drug underwent photooxidative processes following an initial oxygen addition to the double bond of the five membered ring and was mainly converted into a spiro compound and a macrolactam. Ecotoxicity tests were performed on etodolac, its photostable spiro derivative and its sunlight irradiation mixture on two different aquatic trophic levels, plants (algae) and invertebrates (rotifers and crustaceans). Mutagenesis and genotoxicity were detected on bacterial strains. The results showed that only etodolac had long term effects on rotifers although at concentrations far from environmental detection values. A mutagenic and genotoxic potential was found for its derivative.

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Citations

Oct 11, 2015·Journal of Photochemistry and Photobiology. B, Biology·Gabriela V FerrariNorman A García
Dec 2, 2017·International Journal of Environmental Research and Public Health·Xinjiang HuYunguo Liu
Dec 24, 2018·Ecotoxicology and Environmental Safety·Maria Rosaria IesceMarina Isidori
Jul 14, 2021·Environmental Research·Antonietta SicilianoMarina DellaGreca

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