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Novikov MV, Snytnikova OA, Fedunov RG, Yanshole VV, Grivin VP, Plyusnin VF, Xu J, Pozdnyakov IP. A new view on the mechanism of UV photodegradation of the tricyclic antidepressant carbamazepine in aqueous solutions. CHEMOSPHERE 2023; 329:138652. [PMID: 37040836 DOI: 10.1016/j.chemosphere.2023.138652] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2022] [Revised: 04/06/2023] [Accepted: 04/07/2023] [Indexed: 05/03/2023]
Abstract
Mechanism of direct UV photolysis of the tricyclic antidepressant carbamazepine (CBZ) at neutral pH was revealed by a combination of nanosecond laser flash photolysis, steady-state photolysis combined with high resolution LC-MS and DFT quantum-chemical calculations. The detection of short-lived intermediates and the detailed identification of final products were performed for the first time. The quantum yield of CBZ photodegradation (282 nm) is about 0.1% and 0.18% in air-equilibrated and argon-saturated solutions. The primary stage is photoionization with the formation of CBZ cation radical followed by a rapid nucleophilic attack by a solvent molecule. The primary photoproducts are 10-oxo-9-hydro-carbamazepine, 9-formylacridine-10(9H)-carboxamide (a result of ring contraction) and various isomers of hydroxylated CBZ. Prolonged irradiation results to accumulation of acridine derivatives, which should lead to an increase of the toxicity of photolyzed CBZ solutions. The obtained results may be important for understanding the fate of tricyclic antidepressants in processes of UVC disinfection and in natural waters under action of sunlight.
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Affiliation(s)
- Mikhail V Novikov
- Novosibirsk State University, 630090, 2 Pirogova Str., Novosibirsk, Russian Federation; Voevodsky Institute of Chemical Kinetics and Combustion SB RAS, 630090, 3 Institutskaya Str., Novosibirsk, Russian Federation
| | - Olga A Snytnikova
- Novosibirsk State University, 630090, 2 Pirogova Str., Novosibirsk, Russian Federation; International Tomography Center SB RAS, 630090, 3a Institutskaya Str., Novosibirsk, Russian Federation
| | - Roman G Fedunov
- Novosibirsk State University, 630090, 2 Pirogova Str., Novosibirsk, Russian Federation; Voevodsky Institute of Chemical Kinetics and Combustion SB RAS, 630090, 3 Institutskaya Str., Novosibirsk, Russian Federation
| | - Vadim V Yanshole
- Novosibirsk State University, 630090, 2 Pirogova Str., Novosibirsk, Russian Federation; International Tomography Center SB RAS, 630090, 3a Institutskaya Str., Novosibirsk, Russian Federation
| | - Vyacheslav P Grivin
- Voevodsky Institute of Chemical Kinetics and Combustion SB RAS, 630090, 3 Institutskaya Str., Novosibirsk, Russian Federation
| | - Victor F Plyusnin
- Novosibirsk State University, 630090, 2 Pirogova Str., Novosibirsk, Russian Federation; Voevodsky Institute of Chemical Kinetics and Combustion SB RAS, 630090, 3 Institutskaya Str., Novosibirsk, Russian Federation
| | - Jing Xu
- State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, 430072, Wuhan, PR China
| | - Ivan P Pozdnyakov
- Novosibirsk State University, 630090, 2 Pirogova Str., Novosibirsk, Russian Federation; Voevodsky Institute of Chemical Kinetics and Combustion SB RAS, 630090, 3 Institutskaya Str., Novosibirsk, Russian Federation.
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Erokhin SE, Snytnikova OA, Novikov MV, Fedunov RG, Grivin VP, Yanshole VV, Xu J, Wu F, Plyusnin VF, Pozdnyakov IP. Probing reactions between imipramine and hydroxyl radical with the photolysis of iron(III) oxalate: Implications for the indirect photooxidation of tricyclic antidepressants in waters. J Photochem Photobiol A Chem 2022. [DOI: 10.1016/j.jphotochem.2021.113559] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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