This study describes a multidisciplinary approach that investigates the breakdown potential of a laccase mediated system from Trametes pubescens MUT 2400 against several micropollutants including already recognized endocrine disrupting chemicals at their natural residual concentrations (from μg/L up to ng/L). In model solution, the chemical speciation focused on a mixture of 18 analytes and adopted stir bar sorptive extraction with directed in-situ derivatization followed by gas chromatography and mass spectroscopy analysis. The method's key performance parameters were evaluated in consideration of the chemical peculiarities and complexity of real wastewaters: precision, accuracy, estimated working range extended to a wide residual concentration interval (10 ng/L to100 μg/L) indicated its fitness for purpose. Laccases were extremely active towards all the target compounds, both in term of removal yields and rate. The maximal percentage of removal was obtained for 4-t-butylphenol, 2-hydroxybiphenyl, 4-n-octylphenol, salicylic acid and estrone (percentage of removal above 90%). Enzymes concentration played a central role and in most of the cases, the catalyzed reactions were very fast: the initial concentration of 9 compounds was halved within the first 3 h. The laccase-mediated treatment was then applied to a municipal wastewater collected in a real wastewater treatment plant, containing at least 9 xenobiotics as drugs, pesticides, plasticizers and personal care products. Although the harsh chemical and biological conditions of the effluent influenced enzyme stability, the reaction took place, and above 70% transformation was obtained for most analytes during the 24 h experiment. Bioassays were carried out to estimate the estrogenic activity (the E-screen test and the MELN gene-reporter luciferase assay) and the ecotoxicity (Lepidium sativum, Pseudokirchneriella subcapitata and Vibrio fischeri), demonstrating the capability of laccases to mediate an effective detoxification of the wastewater and a decrease of the estrogenic activity.

Removal of micropollutants by fungal laccases in model solution and municipal wastewater: evaluation of estrogenic activity and ecotoxicity

SPINA, FEDERICA;CORDERO, Chiara Emilia Irma;SCHILIRO', Tiziana;SGORBINI, Barbara;PIGNATA, Cristina;GILLI, Giorgio;VARESE, Giovanna, Cristina
Last
2015

Abstract

This study describes a multidisciplinary approach that investigates the breakdown potential of a laccase mediated system from Trametes pubescens MUT 2400 against several micropollutants including already recognized endocrine disrupting chemicals at their natural residual concentrations (from μg/L up to ng/L). In model solution, the chemical speciation focused on a mixture of 18 analytes and adopted stir bar sorptive extraction with directed in-situ derivatization followed by gas chromatography and mass spectroscopy analysis. The method's key performance parameters were evaluated in consideration of the chemical peculiarities and complexity of real wastewaters: precision, accuracy, estimated working range extended to a wide residual concentration interval (10 ng/L to100 μg/L) indicated its fitness for purpose. Laccases were extremely active towards all the target compounds, both in term of removal yields and rate. The maximal percentage of removal was obtained for 4-t-butylphenol, 2-hydroxybiphenyl, 4-n-octylphenol, salicylic acid and estrone (percentage of removal above 90%). Enzymes concentration played a central role and in most of the cases, the catalyzed reactions were very fast: the initial concentration of 9 compounds was halved within the first 3 h. The laccase-mediated treatment was then applied to a municipal wastewater collected in a real wastewater treatment plant, containing at least 9 xenobiotics as drugs, pesticides, plasticizers and personal care products. Although the harsh chemical and biological conditions of the effluent influenced enzyme stability, the reaction took place, and above 70% transformation was obtained for most analytes during the 24 h experiment. Bioassays were carried out to estimate the estrogenic activity (the E-screen test and the MELN gene-reporter luciferase assay) and the ecotoxicity (Lepidium sativum, Pseudokirchneriella subcapitata and Vibrio fischeri), demonstrating the capability of laccases to mediate an effective detoxification of the wastewater and a decrease of the estrogenic activity.
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Endocrine disrupting chemical; Estrogenic activity; Fungal laccase; Municipal wastewater; Ecotoxicity; Stir-bar sorptive extraction
Spina, Federica; Cordero, Chiara; Schilirò, Tiziana; Sgorbini, Barbara; Pignata, Cristina; Gilli, Giorgio; Bicchi, Claudio; Varese, Giovanna Cristina
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2318/1520842
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