Non-steroidal anti-inflammatory drugs (NSAIDs) are widely found pollutants in the aquatic environment and the currently available treatments for their removal are usually associated with some drawbacks. The aim of this research was to apply a laccase-mediator system for the degradation of some commonly used NSAIDs, namely diclofenac (DCF), naproxen (NAP) and ketoprofen (KP). The biocatalyst was obtained by direct immobilization on chitosan beads of a periodate-oxided laccase from Trametes versicolor. A preliminary study aimed to optimize DCF degradation in the presence of 2,2-azinobis (3-ethylbenzothiazoline-6-sulfonicacid) diammonium salt (ABTS) as mediator. It turned out that pH 3 and a 1:1 M ratio for ABTS:drug were the best experimental conditions under which DCF was degraded at 90% after 3 h. In addition, an efficient reuse of the biocatalyst for up to 5 cycles emerged. DCF was further mixed with naproxen and ketoprofen to test whether laccase was still able to eliminate DCF and eventually act on the other compounds. At just 0.02 U of laccase activity, diclofenac was completely degraded within 3 h, while an almost complete removal for naproxen (∼90%) and a partial removal for ketoprofen (30%) occurred in 7 d when drugs were added at high concentrations (78.5 μM, 98 μM and 108 μM, respectively). After 7 d of degradation, transformation products of diclofenac, identified as hydroxylated compounds, disappeared. Naproxen products were, instead, reduced to very small amounts.

A new Laccase-Mediator system facing the biodegradation challenge: insight into the NSAIDs removal / Apriceno, Azzurra; Astolfi, Maria Luisa; Girelli, Anna Maria; Scuto, FRANCESCA ROMANA. - In: CHEMOSPHERE. - ISSN 0045-6535. - 215:(2018), pp. 535-542. [10.1016/j.chemosphere.2018.10.086]

A new Laccase-Mediator system facing the biodegradation challenge: insight into the NSAIDs removal

Azzurra Apriceno;Maria Luisa Astolfi;Anna Maria Girelli
;
Francesca Romana Scuto
2018

Abstract

Non-steroidal anti-inflammatory drugs (NSAIDs) are widely found pollutants in the aquatic environment and the currently available treatments for their removal are usually associated with some drawbacks. The aim of this research was to apply a laccase-mediator system for the degradation of some commonly used NSAIDs, namely diclofenac (DCF), naproxen (NAP) and ketoprofen (KP). The biocatalyst was obtained by direct immobilization on chitosan beads of a periodate-oxided laccase from Trametes versicolor. A preliminary study aimed to optimize DCF degradation in the presence of 2,2-azinobis (3-ethylbenzothiazoline-6-sulfonicacid) diammonium salt (ABTS) as mediator. It turned out that pH 3 and a 1:1 M ratio for ABTS:drug were the best experimental conditions under which DCF was degraded at 90% after 3 h. In addition, an efficient reuse of the biocatalyst for up to 5 cycles emerged. DCF was further mixed with naproxen and ketoprofen to test whether laccase was still able to eliminate DCF and eventually act on the other compounds. At just 0.02 U of laccase activity, diclofenac was completely degraded within 3 h, while an almost complete removal for naproxen (∼90%) and a partial removal for ketoprofen (30%) occurred in 7 d when drugs were added at high concentrations (78.5 μM, 98 μM and 108 μM, respectively). After 7 d of degradation, transformation products of diclofenac, identified as hydroxylated compounds, disappeared. Naproxen products were, instead, reduced to very small amounts.
2018
immobilized laccase; chitosan support; nsaids degradation; abtsn
01 Pubblicazione su rivista::01a Articolo in rivista
A new Laccase-Mediator system facing the biodegradation challenge: insight into the NSAIDs removal / Apriceno, Azzurra; Astolfi, Maria Luisa; Girelli, Anna Maria; Scuto, FRANCESCA ROMANA. - In: CHEMOSPHERE. - ISSN 0045-6535. - 215:(2018), pp. 535-542. [10.1016/j.chemosphere.2018.10.086]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1187403
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