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Fernandez HA, Weavers LK. The impact of inorganic salts on the ultrasonic degradation of contaminants: A review. ULTRASONICS SONOCHEMISTRY 2024; 111:107076. [PMID: 39357212 DOI: 10.1016/j.ultsonch.2024.107076] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2024] [Revised: 06/28/2024] [Accepted: 09/17/2024] [Indexed: 10/04/2024]
Abstract
This comprehensive review explores the interplay between inorganic salts and ultrasound-assisted degradation of various contaminants. The addition of salt to aqueous matrices has been attributed to increasing contaminant degradation via the salting-out effect. However, research investigating the impact of salt on degradation has yielded inconsistent results. This review incorporated degradation information from 44 studies organizing data according to compound class and ionic strength to analyze the impact of inorganic salts on cavitation bubble dynamics, contaminant behavior, radical species generation, and contaminant degradation. Frequency and salt type were assessed for potential roles in contaminant degradation. The analysis showed that high intensity ultrasound was most beneficial to degradation in salt solutions. Unexpectedly, hydrophilic compounds showed marked enhancement with increasing ionic strength while many hydrophobic compounds did not benefit as greatly. Based on the collected data and analysis, enhanced degradation in the presence of salt appears to be primarily radical-mediated rather than due to the salting-out effect. Finally, the analysis provides guidance for designing sonolytic reactors for contaminant degradation.
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Affiliation(s)
- Haleigh A Fernandez
- Department of Civil, Environmental, and Geodetic Engineering, The Ohio State University, Columbus, OH 43210, United States
| | - Linda K Weavers
- Department of Civil, Environmental, and Geodetic Engineering, The Ohio State University, Columbus, OH 43210, United States.
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2
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Chen M, Moher D, Rogers J, Yatom S, Thimsen E, Parker KM. Effects of Halides on Organic Compound Degradation during Plasma Treatment of Brines. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2024; 58:5139-5152. [PMID: 38446791 DOI: 10.1021/acs.est.3c07162] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/08/2024]
Abstract
Plasma has been proposed as an alternative strategy to treat organic contaminants in brines. Chemical degradation in these systems is expected to be partially driven by halogen oxidants, which have been detected in halide-containing solutions exposed to plasma. In this study, we characterized specific mechanisms involving the formation and reactions of halogen oxidants during plasma treatment. We first demonstrated that addition of halides accelerated the degradation of a probe compound known to react quickly with halogen oxidants (i.e., para-hydroxybenzoate) but did not affect the degradation of a less reactive probe compound (i.e., benzoate). This effect was attributed to the degradation of para-hydroxybenzoate by hypohalous acids, which were produced via a mechanism involving halogen radicals as intermediates. We applied this mechanistic insight to investigate the impact of constituents in brines on reactions driven by halogen oxidants during plasma treatment. Bromide, which is expected to occur alongside chloride in brines, was required to enable halogen oxidant formation, consistent with the generation of halogen radicals from the oxidation of halides by hydroxyl radical. Other constituents typically present in brines (i.e., carbonates, organic matter) slowed the degradation of organic compounds, consistent with their ability to scavenge species involved during plasma treatment.
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Affiliation(s)
- Moshan Chen
- Department of Energy, Environmental & Chemical Engineering, Washington University in St. Louis, St. Louis, Missouri 63130, United States
| | - Dillon Moher
- Department of Energy, Environmental & Chemical Engineering, Washington University in St. Louis, St. Louis, Missouri 63130, United States
| | - Jacqueline Rogers
- Department of Energy, Environmental & Chemical Engineering, Washington University in St. Louis, St. Louis, Missouri 63130, United States
| | - Shurik Yatom
- Princeton Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08540 , United States
| | - Elijah Thimsen
- Department of Energy, Environmental & Chemical Engineering, Washington University in St. Louis, St. Louis, Missouri 63130, United States
| | - Kimberly M Parker
- Department of Energy, Environmental & Chemical Engineering, Washington University in St. Louis, St. Louis, Missouri 63130, United States
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3
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Pierzchała K, Pięta J, Pięta M, Rola M, Zielonka J, Sikora A, Marcinek A, Michalski R. Boronate-Based Oxidant-Responsive Derivatives of Acetaminophen as Proinhibitors of Myeloperoxidase. Chem Res Toxicol 2023; 36:1398-1408. [PMID: 37534491 PMCID: PMC10445283 DOI: 10.1021/acs.chemrestox.3c00140] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2023] [Indexed: 08/04/2023]
Abstract
Myeloperoxidase (MPO) is an important component of the human innate immune system and the main source of a strong oxidizing and chlorinating species, hypochlorous acid (HOCl). Inadvertent, misplaced, or excessive generation of HOCl by MPO is associated with multiple human inflammatory diseases. Therefore, there is a considerable interest in the development of MPO inhibitors. Here, we report the synthesis and characterization of a boronobenzyl derivative of acetaminophen (AMBB), which can function as a proinhibitor of MPO and release acetaminophen, the inhibitor of chlorination cycle of MPO, in the presence of inflammatory oxidants, i.e., hydrogen peroxide, hypochlorous acid, or peroxynitrite. We demonstrate that the AMBB proinhibitor undergoes conversion to acetaminophen by all three oxidants, with the involvement of the primary phenolic product intermediate, with relatively long half-life at pH 7.4. The determined rate constants of the reaction of the AMBB proinhibitor with hydrogen peroxide, hypochlorous acid, or peroxynitrite are equal to 1.67, 1.6 × 104, and 1.0 × 106 M-1 s-1, respectively. AMBB showed lower MPO inhibitory activity (IC50 > 0.3 mM) than acetaminophen (IC50 = 0.14 mM) toward MPO-dependent HOCl generation. Finally, based on the determined reaction kinetics and the observed inhibitory effects of two plasma components, uric acid and albumin, on the extent of AMBB oxidation by ONOO- and HOCl, we conclude that ONOO- is the most likely potential activator of AMBB in human plasma.
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Affiliation(s)
- Karolina Pierzchała
- Institute
of Applied Radiation Chemistry, Department of Chemistry, Lodz University of Technology, Zeromskiego 116, 90-924 Lodz, Poland
| | - Jakub Pięta
- Institute
of Applied Radiation Chemistry, Department of Chemistry, Lodz University of Technology, Zeromskiego 116, 90-924 Lodz, Poland
| | - Marlena Pięta
- Institute
of Applied Radiation Chemistry, Department of Chemistry, Lodz University of Technology, Zeromskiego 116, 90-924 Lodz, Poland
| | - Monika Rola
- Institute
of Applied Radiation Chemistry, Department of Chemistry, Lodz University of Technology, Zeromskiego 116, 90-924 Lodz, Poland
| | - Jacek Zielonka
- Department
of Biophysics and Free Radical Research Center, Medical College of Wisconsin, 8701 Watertown Plank Road, Milwaukee, Wisconsin 53226, United States
| | - Adam Sikora
- Institute
of Applied Radiation Chemistry, Department of Chemistry, Lodz University of Technology, Zeromskiego 116, 90-924 Lodz, Poland
| | - Andrzej Marcinek
- Institute
of Applied Radiation Chemistry, Department of Chemistry, Lodz University of Technology, Zeromskiego 116, 90-924 Lodz, Poland
| | - Radosław Michalski
- Institute
of Applied Radiation Chemistry, Department of Chemistry, Lodz University of Technology, Zeromskiego 116, 90-924 Lodz, Poland
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4
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Wu JC, Chuang YH, Liou SYH, Li Q, Hou CH. In situ engineering of highly conductive TiO 2/carbon heterostructure fibers for enhanced electrocatalytic degradation of water pollutants. JOURNAL OF HAZARDOUS MATERIALS 2022; 429:128328. [PMID: 35114455 DOI: 10.1016/j.jhazmat.2022.128328] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2021] [Revised: 12/27/2021] [Accepted: 01/19/2022] [Indexed: 06/14/2023]
Abstract
Rational design of nanocomposite electrode materials with high conductivity, activity, and mechanical strength is critical in electrocatalysis. Herein, freestanding, flexible heteronanocomposites were fabricated in situ by carbonizing electrospun fibers with TiO2 nanoparticles on the surface for electrocatalytic degradation of water pollutants. The carbonization temperature was observed as a dominant parameter affecting the characteristics of the electrodes. As the carbonization temperature increased to 1000 °C, the conductivity of the electrode was significantly enhanced due to the high degree of graphitization (ID/IG ratio 1.10) and the dominant rutile phase. Additionally, the formation of TiO2 protrusions and the C-Ti heterostructure were observed at 1000 °C, which contributed to increasing the electrocatalytic activity. When 1.5 V (vs. Ag/AgCl) was employed, electrocatalytic experiments using the electrode achieved 90% degradation of crystal violet and 10.9-87.5% for an array of micropollutants. The electrical energy-per-order (EEO) for the removal of crystal violet was 0.7 kWh/m3/order, indicative of low-energy requirement. The efficient electrocatalytic activity can be ascribed to the fast electron transfer and the strong ability to generate hydroxyl radicals. Our findings expand efforts for the design of highly conductive heteronanocomposites in a facile in situ approach, providing a promising perspective for the energy-efficient electrocatalytic degradation of water pollutants.
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Affiliation(s)
- Jhen-Cih Wu
- Graduate Institute of Environmental Engineering, National Taiwan University, No. 1, Section 4, Roosevelt Road, Taipei 10617, Taiwan
| | - Yi-Hsueh Chuang
- Institute of Environmental Engineering, National Yang Ming Chiao Tung University, 1001 University Road, East District, Hsinchu 30010, Taiwan
| | - Sofia Ya Hsuan Liou
- Department of Geosciences, National Taiwan University, No. 1, Section 4, Roosevelt Road, Taipei 10617, Taiwan; Research Center for Future Earth, National Taiwan University, No. 1, Section 4. Roosevelt Rd., Taipei 10617, Taiwan
| | - Qilin Li
- Department of Civil and Environmental Engineering, Rice University, 6100 Main Street MS 519, Houston, TX 77005, USA; Nanosystems Engineering Research Center for Nanotechnology-Enabled Water Treatment, 6100 Main Street MS 6398, Houston, TX 77005, USA
| | - Chia-Hung Hou
- Graduate Institute of Environmental Engineering, National Taiwan University, No. 1, Section 4, Roosevelt Road, Taipei 10617, Taiwan; Research Center for Future Earth, National Taiwan University, No. 1, Section 4. Roosevelt Rd., Taipei 10617, Taiwan.
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5
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Wojnárovits L, Takács E. Rate constants of dichloride radical anion reactions with molecules of environmental interest in aqueous solution: a review. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:41552-41575. [PMID: 34086177 PMCID: PMC8354983 DOI: 10.1007/s11356-021-14453-w] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2020] [Accepted: 05/13/2021] [Indexed: 05/14/2023]
Abstract
Natural waters, water droplets in the air at coastal regions and wastewaters usually contain chloride ions (Cl-) in relatively high concentrations in the milimolar range. In the reactions of highly oxidizing radicals (e.g., •OH, •NO3, or SO4•-) in the nature or during wastewater treatment in advanced oxidation processes the chloride ions easily transform to chlorine containing radicals, such as Cl•, Cl2•-, and ClO•. This transformation basically affects the degradation of organic molecules. In this review about 400 rate constants of the dichloride radical anion (Cl2•-) with about 300 organic molecules is discussed together with the reaction mechanisms. The reactions with phenols, anilines, sulfur compounds (with sulfur atom in lower oxidation state), and molecules with conjugated electron systems are suggested to take place with electron transfer mechanism. The rate constant is high (107-109 M-1 s-1) when the reduction potential the one-electron oxidized species/molecule couple is well below that of the Cl2•-/2Cl- couple.
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Affiliation(s)
- László Wojnárovits
- Radiation Chemistry Department, Institute for Energy Security and Environmental Safety, Centre for Energy Research, H-1121 Konkoly-Thege Miklós út, Budapest, 29-33, Hungary
| | - Erzsébet Takács
- Radiation Chemistry Department, Institute for Energy Security and Environmental Safety, Centre for Energy Research, H-1121 Konkoly-Thege Miklós út, Budapest, 29-33, Hungary.
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6
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Wojnárovits L, Tóth T, Takács E. Rate constants of carbonate radical anion reactions with molecules of environmental interest in aqueous solution: A review. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 717:137219. [PMID: 32084688 DOI: 10.1016/j.scitotenv.2020.137219] [Citation(s) in RCA: 59] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2019] [Revised: 01/23/2020] [Accepted: 02/07/2020] [Indexed: 05/09/2023]
Abstract
The rate constants of carbonate radical anion (CO3-) reaction with organic molecules, mainly of environmental interest, were collected from the literature and structure effects were discussed together with methods of rate constant determination and reaction mechanisms. These rate constants are essential for modelling chemical processes taking place with participation of reactive radicals in the environment determining the persistence of certain toxic compounds. The rate constants span over a very wide range from 102 to 109 mol-1 dm3 s-1, but, even the highest values are smaller by a factor of 2-5 as the diffusion controlled limit. This survey shows that only those molecules have high rate constants in the 107-109 mol-1 dm3 s-1 range which have special electron rich part(s). These molecules are removed selectively in CO3- reactions. Such electron rich moiety is the NH2 group attached to an aromatic ring. High vales were measured e.g., for most of anilines or the sulfonamide antibiotics. -CO group attached to the N-atom (in acetanilides and in phenylurea herbicides), or strong electron withdrawing substituents on benzene ring strongly decrease the rate constant. High values were also measured for aromatic molecules with dissociated -OH group (O-, phenoxides). The thioether group (e.g., in amino acids, or in fenthion or phorate insecticides) also activates the molecules in CO3- reactions.
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Affiliation(s)
- László Wojnárovits
- Radiation Chemistry Department, Institute for Energy Security and Environmental Safety, Centre for Energy Research, H-1121 Budapest, Konkoly-Thege Miklós út 29-33, Hungary.
| | - Tünde Tóth
- Radiation Chemistry Department, Institute for Energy Security and Environmental Safety, Centre for Energy Research, H-1121 Budapest, Konkoly-Thege Miklós út 29-33, Hungary.
| | - Erzsébet Takács
- Radiation Chemistry Department, Institute for Energy Security and Environmental Safety, Centre for Energy Research, H-1121 Budapest, Konkoly-Thege Miklós út 29-33, Hungary.
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7
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Kovács K, Simon Á, Balogh GT, Tóth T, Wojnárovits L. High-energy ionizing radiation-induced degradation of amodiaquine in dilute aqueous solution: radical reactions and kinetics. Free Radic Res 2020; 54:185-194. [DOI: 10.1080/10715762.2020.1736579] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Krisztina Kovács
- Institute for Energy Security and Environmental Safety, Centre for Energy Research, Budapest, Hungary
| | - Ádám Simon
- Institute for Energy Security and Environmental Safety, Centre for Energy Research, Budapest, Hungary
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Budapest, Hungary
| | - György Tibor Balogh
- Department of Chemical and Environmental Process Engineering, Budapest University of Technology and Economics, Budapest, Hungary
- Department of Pharmacodynamics and Biopharmacy, University of Szeged, Szeged, Hungary
| | - Tünde Tóth
- Institute for Energy Security and Environmental Safety, Centre for Energy Research, Budapest, Hungary
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Budapest, Hungary
| | - László Wojnárovits
- Institute for Energy Security and Environmental Safety, Centre for Energy Research, Budapest, Hungary
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8
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Chen Y, Zhang X, Feng S. Contribution of the Excited Triplet State of Humic Acid and Superoxide Radical Anion to Generation and Elimination of Phenoxyl Radical. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2018; 52:8283-8291. [PMID: 29916697 DOI: 10.1021/acs.est.8b00890] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Contributions of excited triplet state of humic acid (3HA*) and superoxide radical anion (O2•-), which is mainly generated via the reaction of O2 with HA-derived reducing intermediates (HA•-), to phenol transformation were revealed using acetaminophen, 2,4,6-trimethylphenol and tyrosine as probe molecules. Phenol transformation was initiated by 3HA*, leading to the formation of the phenoxyl radical (PhO•), but the distribution of transformation intermediates was codetermined by 3HA* and HA•-. The influence of HA•- essentially resulted from the production of O2•-, which affected the fate of PhO•. PhO• could undergo dimerization, or react with O2•-, leading to either phenol peroxide formation (radical addition) or phenol regeneration (electron transfer). In addition, PhO• could bind to HA or react with HA radicals, particularly in the absence of O2 and O2•-. These PhO• reactions were dependent on the reduction potential and structure of PhO•. This study also proved that the reaction of phenol with 1O2 and the reaction of PhO• with O2•- lead to the same oxidation product. The contributions of 3HA* and its generated 1O2, HA•- and its generated O2•- to phenol transformation were pH-dependent.
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Affiliation(s)
- Yuan Chen
- Department of Environmental Science , School of Resources and Environmental Science, Wuhan University , Wuhan 430079 , P.R. China
| | - Xu Zhang
- Department of Environmental Science , School of Resources and Environmental Science, Wuhan University , Wuhan 430079 , P.R. China
| | - Shixiang Feng
- Department of Environmental Science , School of Resources and Environmental Science, Wuhan University , Wuhan 430079 , P.R. China
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9
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Berto S, Carena L, Chiavazza E, Marletti M, Fin A, Giacomino A, Malandrino M, Barolo C, Prenesti E, Vione D. Off-line and real-time monitoring of acetaminophen photodegradation by an electrochemical sensor. CHEMOSPHERE 2018; 204:556-562. [PMID: 29602587 DOI: 10.1016/j.chemosphere.2018.03.069] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2018] [Revised: 03/09/2018] [Accepted: 03/10/2018] [Indexed: 06/08/2023]
Abstract
The photochemistry of N-acetyl-para-aminophenol (acetaminophen, APAP) is here investigated by using differential pulse voltammetry (DPV) analysis to monitor APAP photodegradation upon steady-state irradiation. The purpose of this work is to assess the applicability of DPV to monitor the photochemical behaviour of xenobiotics, along with the development of an electrochemical set-up for the real-time monitoring of APAP photodegradation. We here investigated the APAP photoreactivity towards the main photogenerated reactive transients species occurring in sunlit surface waters (hydroxyl radical HO, carbonate radical CO3-, excited triplet state of anthraquinone-2-sulfonate used as proxy of the chromophoric DOM, and singlet oxygen 1O2), and determined relevant kinetic parameters. A standard procedure based on UV detection coupled with liquid chromatography (HPLC-UV) was used under identical experimental conditions to compare and verify the DPV-based results. The latter were in agreement with HPLC data, with the exception of the triplet-sensitized processes. In the other cases, DPV could be used as an alternative to the well-tested but more costly and time-consuming HPLC-UV technique. We have also assessed the reaction rate constant between APAP and HO by real-time DPV, which allowed for the monitoring of APAP photodegradation inside the irradiation chamber. Unfortunately, real-time DPV measurements are likely to be affected by temperature variations of the irradiated samples. Overall, DPV appeared as a fast, cheap and reasonably reliable technique when used for the off-line monitoring of APAP photodegradation. When a suitable real-time procedure is developed, it could become a very straightforward method to study the photochemical behaviour of electroactive xenobiotics.
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Affiliation(s)
- Silvia Berto
- Dept. of Chemistry, University of Torino, Via P. Giuria 7, 10125 Turin, Italy.
| | - Luca Carena
- Dept. of Chemistry, University of Torino, Via P. Giuria 7, 10125 Turin, Italy.
| | - Enrico Chiavazza
- Dept. of Chemistry, University of Torino, Via P. Giuria 7, 10125 Turin, Italy
| | - Matteo Marletti
- Dept. of Chemistry, University of Torino, Via P. Giuria 7, 10125 Turin, Italy
| | - Andrea Fin
- Dept. of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA 92093-0358, United States
| | - Agnese Giacomino
- Dept. of Drug Science and Technology, University of Torino, Via P. Giuria 9, 10125 Turin, Italy
| | - Mery Malandrino
- Dept. of Chemistry, University of Torino, Via P. Giuria 7, 10125 Turin, Italy
| | - Claudia Barolo
- Dept. of Chemistry, University of Torino, Via P. Giuria 7, 10125 Turin, Italy; INSTM and NIS Centre, University of Torino, Via Quarello 15A, 10135 Turin, Italy
| | - Enrico Prenesti
- Dept. of Chemistry, University of Torino, Via P. Giuria 7, 10125 Turin, Italy
| | - Davide Vione
- Dept. of Chemistry, University of Torino, Via P. Giuria 7, 10125 Turin, Italy
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Trellu C, Coetsier C, Rouch JC, Esmilaire R, Rivallin M, Cretin M, Causserand C. Mineralization of organic pollutants by anodic oxidation using reactive electrochemical membrane synthesized from carbothermal reduction of TiO 2. WATER RESEARCH 2018; 131:310-319. [PMID: 29306202 DOI: 10.1016/j.watres.2017.12.070] [Citation(s) in RCA: 71] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2017] [Revised: 12/22/2017] [Accepted: 12/24/2017] [Indexed: 06/07/2023]
Abstract
Reactive Electrochemical Membrane (REM) prepared from carbothermal reduction of TiO2 is used for the mineralization of biorefractory pollutants during filtration operation. The mixture of Ti4O7 and Ti5O9 Magnéli phases ensures the high reactivity of the membrane for organic compound oxidation through •OH mediated oxidation and direct electron transfer. In cross-flow filtration mode, convection-enhanced mass transport of pollutants can be achieved from the high membrane permeability (3300 LMH bar-1). Mineralization efficiency of oxalic acid, paracetamol and phenol was assessed as regards to current density, transmembrane pressure and feed concentration. Unprecedented high removal rates of total organic carbon and mineralization current efficiency were achieved after a single passage through the REM, e.g. 47 g m-2 h-1 - 72% and 6.7 g m-2 h-1 - 47% for oxalic acid and paracetamol, respectively, at 15 mA cm-2. However, two mechanisms have to be considered for optimization of the process. When the TOC flux is too high with respect to the current density, aromatic compounds polymerize in the REM layer where only direct electron transfer occurs. This phenomenon decreases the oxidation efficiency and/or increases REM fouling. Besides, O2 bubbles sweeping at high permeate flux promotes O2 gas generation, with adverse effect on oxidation efficiency.
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Affiliation(s)
- Clément Trellu
- Laboratoire de Génie Chimique, Université de Toulouse, CNRS, INPT, UPS, Toulouse, France.
| | - Clémence Coetsier
- Laboratoire de Génie Chimique, Université de Toulouse, CNRS, INPT, UPS, Toulouse, France
| | - Jean-Christophe Rouch
- Laboratoire de Génie Chimique, Université de Toulouse, CNRS, INPT, UPS, Toulouse, France
| | - Roseline Esmilaire
- Institut Européen des Membranes, UMR 5635 (CNRS-ENSCM-UM), Montpellier, France
| | - Matthieu Rivallin
- Institut Européen des Membranes, UMR 5635 (CNRS-ENSCM-UM), Montpellier, France
| | - Marc Cretin
- Institut Européen des Membranes, UMR 5635 (CNRS-ENSCM-UM), Montpellier, France
| | - Christel Causserand
- Laboratoire de Génie Chimique, Université de Toulouse, CNRS, INPT, UPS, Toulouse, France
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11
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Peng H, Chen Y, Mao L, Zhang X. Significant changes in the photo-reactivity of TiO 2 in the presence of a capped natural dissolved organic matter layer. WATER RESEARCH 2017; 110:233-240. [PMID: 28011363 DOI: 10.1016/j.watres.2016.12.025] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2016] [Revised: 12/14/2016] [Accepted: 12/16/2016] [Indexed: 06/06/2023]
Abstract
Natural dissolved organic matter (NDOM) in surface waters has a high sorption affinity for TiO2 during long contact. An attached NDOM layer can act as a conduction band electron and/or valance band hole acceptor, and NDOM can also decrease the concentration of hydroxyl radicals (OH) in the bulk phase. Therefore, the degradation kinetics and mechanism for degradation of acetaminophen on NDOM capped TiO2 (NDOM-TiO2) are significantly different from those on raw TiO2. Quantum calculation results suggest that hydroxylation to the ortho position in relation to the acetamide group is more favorable. Although OH induced hydroxylation is the predominant pathway for degradation of acetaminophen on TiO2, one-electron oxidation of acetaminophen by a valance band hole, excited triplet NDOM or NDOM radical cation is the major degradation pathway on NDOM-TiO2. This study is the first to detect and confirm APAP oligomers as intermediates during the degradation of acetaminophen by TiO2 photocatalysis, especially when using NDOM-TiO2 as a catalyst. The results suggest the reactivity of TiO2 could change significantly after long exposure to natural water, which need to be concerned about for removal of micropollutants in surface water by TiO2 photocatalysis.
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Affiliation(s)
- Hong Peng
- State Key Laboratory of Water Resources and Hydropower Engineering Science, School of Water Resources and Hydropower, Wuhan University, Wuhan, 430072, PR China
| | - Yuan Chen
- School of Resources and Environmental Science, Hubei Biomass-Resource Chemistry and Environmental Biotechnology Key Laboratory, Wuhan University, Wuhan, 430079, PR China
| | - Lu Mao
- School of Resources and Environmental Science, Hubei Biomass-Resource Chemistry and Environmental Biotechnology Key Laboratory, Wuhan University, Wuhan, 430079, PR China
| | - Xu Zhang
- School of Resources and Environmental Science, Hubei Biomass-Resource Chemistry and Environmental Biotechnology Key Laboratory, Wuhan University, Wuhan, 430079, PR China.
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12
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Liang C, Lan Z, Zhang X, Liu Y. Mechanism for the primary transformation of acetaminophen in a soil/water system. WATER RESEARCH 2016; 98:215-24. [PMID: 27107139 DOI: 10.1016/j.watres.2016.04.027] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2015] [Revised: 04/11/2016] [Accepted: 04/13/2016] [Indexed: 05/25/2023]
Abstract
The transformation of acetaminophen (APAP) in a soil/water system was systematically investigated by a combination of kinetic studies and a quantitative analysis of the reaction intermediates. Biotransformation was the predominant pathway for the elimination of APAP, whereas hydrolysis or other chemical transformation, and adsorption processes made almost no contribution to the transformation under a dark incubation. Bacillus aryabhattai strain 1-Sj-5-2-5-M, Klebsiella pneumoniae strain S001, and Bacillus subtilis strain HJ5 were the main bacteria identified in the biotransformation of APAP. The soil-to-water ratio and soil preincubation were able to alter the transformation kinetic pattern. Light irradiation promoted the overall transformation kinetics through enhanced biotransformation and extra photosensitized chemical reactions. The transformation pathways were strongly dependent on the initial concentration of APAP. The main primary transformation products were APAP oligomers and p-aminophenol, with the initial addition of 26.5 and 530 μM APAP, respectively. APAP oligomers accounted for more than 95% of transformed APAP, indicating that almost no bound residues were generated through the transformation of APAP in the soil/water system. The potential environmental risks of APAP could increase following the transformation of APAP in the soil/water system because of the higher toxicity of the transformation intermediates.
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Affiliation(s)
- Chuanzhou Liang
- School of Resources and Environmental Science, Wuhan University, Wuhan, 430079, PR China
| | - Zhonghui Lan
- School of Resources and Environmental Science, Wuhan University, Wuhan, 430079, PR China
| | - Xu Zhang
- School of Resources and Environmental Science, Wuhan University, Wuhan, 430079, PR China.
| | - Yingbao Liu
- College of Life Science, Yangtze University, Jingzhou, 434025, PR China.
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13
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Hamer M, Suarez SA, Neuman NI, Alvarez L, Muñoz M, Marti MA, Doctorovich F. Discussing Endogenous NO•/HNO Interconversion Aided by Phenolic Drugs and Vitamins. Inorg Chem 2015; 54:9342-50. [DOI: 10.1021/acs.inorgchem.5b01347] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Mariana Hamer
- Departamento
de Química Analítica y Fisicoquímica, Facultad
de Farmacia y Bioquímica (IQUIFIB-CONICET), Universidad de Buenos Aires, Junin 956, Buenos Aires, Argentina
| | - Sebastian A. Suarez
- Gerencia
de Investigación y Aplicaciones, Centro Atómico Constituyentes, Comisión Nacional de Energía Atómica, Buenos Aires, Argentina
- Departamento
de Química Inorgánica, Analítica y Química
Física, Facultad de Ciencias Exactas y Naturales (INQUIMAE-CONICET), Universidad de Buenos Aires, Ciudad Universitaria, Buenos
Aires, Argentina
| | - Nicolás I. Neuman
- Departamento
de Química Inorgánica, Analítica y Química
Física, Facultad de Ciencias Exactas y Naturales (INQUIMAE-CONICET), Universidad de Buenos Aires, Ciudad Universitaria, Buenos
Aires, Argentina
- Departamento
de Física, Facultad de Bioquímica y Ciencias Biológicas, Universidad Nacional del Litoral, Ciudad Universitaria, Paraje El Pozo, Santa Fe, Argentina
| | - Lucía Alvarez
- Departamento
de Química Inorgánica, Analítica y Química
Física, Facultad de Ciencias Exactas y Naturales (INQUIMAE-CONICET), Universidad de Buenos Aires, Ciudad Universitaria, Buenos
Aires, Argentina
| | - Martina Muñoz
- Departamento
de Química Inorgánica, Analítica y Química
Física, Facultad de Ciencias Exactas y Naturales (INQUIMAE-CONICET), Universidad de Buenos Aires, Ciudad Universitaria, Buenos
Aires, Argentina
| | - Marcelo A. Marti
- Departamento
de Química Biológica, Facultad de Ciencias Exactas y
Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pab. II, Buenos Aires, Argentina
| | - Fabio Doctorovich
- Departamento
de Química Inorgánica, Analítica y Química
Física, Facultad de Ciencias Exactas y Naturales (INQUIMAE-CONICET), Universidad de Buenos Aires, Ciudad Universitaria, Buenos
Aires, Argentina
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Torun M, Gültekin Ö, Şolpan D, Güven O. Mineralization of paracetamol in aqueous solution with advanced oxidation processes. ENVIRONMENTAL TECHNOLOGY 2015; 36:970-982. [PMID: 25263253 DOI: 10.1080/09593330.2014.970585] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Paracetamol is a common analgesic drug widely used in all regions of the world more than hundred tonnes per year and it poses a great problem for the aquatic environment. Its phenolic intermediates are classified as persistent organic pollutants and toxic for the environment as well as human beings. In the present study, the irradiation of aqueous solutions of paracetamol with 60Co gamma-rays was examined on a laboratory scale and its degradation path was suggested with detected radiolysis products. The synergic effect of ozone on gamma-irradiation was investigated by preliminary ozonation before irradiation which reduced the irradiation dose from 5 to 3 kGy to completely remove paracetamol and its toxic intermediate hydroquinone from 6 to 4 kGy as well as increasing the radiation chemical yield (Gi values 1.36 and 1.66 in the absence and presence of ozone, respectively). The observed amount of formed hydroquinone was also decreased in the presence of ozone. There is a decrease in pH from 6.4 to 5.2 and dissolved oxygen consumed, which is up to 0.8 mg l(-1), to form some peroxyl radicals used for oxidation. Analytical measurements were carried out with gas chromatography/mass spectrometry and ion chromatography (IC) both qualitatively and quantitatively. Amounts of paracetamol and hydroquinone were measured with gas chromatography after trimethylsilane derivatization. Small aliphatic acids, such as acetic acid, formic acid and oxalic acid, were measured quantitatively with IC as well as inorganic ions (nitrite and nitrate) in which their yields increase with irradiation.
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Affiliation(s)
- Murat Torun
- a Department of Chemistry , Hacettepe University , Beytepe , 06800 Ankara , Turkey
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15
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Leth R, Rydberg P, Jørgensen FS, Olsen L. Density Functional Theory Study on the Formation of Reactive Benzoquinone Imines by Hydrogen Abstraction. J Chem Inf Model 2015; 55:660-6. [DOI: 10.1021/ci500653b] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Rasmus Leth
- Department of Drug Design
and Pharmacology, University of Copenhagen, Universitetsparken 2, DK-2100 Copenhagen, Denmark
| | - Patrik Rydberg
- Department of Drug Design
and Pharmacology, University of Copenhagen, Universitetsparken 2, DK-2100 Copenhagen, Denmark
| | - Flemming Steen Jørgensen
- Department of Drug Design
and Pharmacology, University of Copenhagen, Universitetsparken 2, DK-2100 Copenhagen, Denmark
| | - Lars Olsen
- Department of Drug Design
and Pharmacology, University of Copenhagen, Universitetsparken 2, DK-2100 Copenhagen, Denmark
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16
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Csay T, Homlok R, Illés E, Takács E, Wojnárovits L. The Chemical Background of Advanced Oxidation Processes. Isr J Chem 2014. [DOI: 10.1002/ijch.201300077] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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17
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Pozdnyakov IP, Zhang X, Maksimova TA, Yanshole VV, Wu F, Grivin VP, Plyusnin VF. Wavelength-dependent photochemistry of acetaminophen in aqueous solutions. J Photochem Photobiol A Chem 2014. [DOI: 10.1016/j.jphotochem.2013.10.006] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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18
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Wojnárovits L, Takács E. Structure dependence of the rate coefficients of hydroxyl radical+aromatic molecule reaction. Radiat Phys Chem Oxf Engl 1993 2013. [DOI: 10.1016/j.radphyschem.2013.02.036] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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19
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Homlok R, Takács E, Wojnárovits L. Degradation of organic molecules in advanced oxidation processes: relation between chemical structure and degradability. CHEMOSPHERE 2013; 91:383-389. [PMID: 23313273 DOI: 10.1016/j.chemosphere.2012.11.073] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2012] [Revised: 11/13/2012] [Accepted: 11/22/2012] [Indexed: 06/01/2023]
Abstract
Hydroxyl radical induced degradation of maleic acid, fumaric acid and 20 aromatic molecules was investigated in air saturated aqueous solutions. Hydroxyl radicals were generated by an advanced oxidation process (AOP), water radiolysis. Oxidation was followed by chemical oxygen demand (COD) and total organic carbon content (TOC) measurements. Up to ∼30-50% decrease of COD the dose dependence was linear. By the ratio of the decrease of COD and the amount of reactive radiolysis intermediates introduced into the solution the oxidation efficiencies were calculated. Efficiencies around 0.5-1 (O2 molecule built in products/OH) found for most of the compounds show that the one-electron-oxidant OH induces 2-4 electron oxidations. The high oxidation rates were explained by OH addition to unsaturated bonds and subsequent reactions of dissolved O2 with organic radicals. In amino substituted molecules or in Acid Red 1 azo dye, O2 cannot compete efficiently with unimolecular transformation of organic radicals and the efficiency is lower (0.2-0.5).
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Affiliation(s)
- Renáta Homlok
- Institute of Isotopes, Centre for Energy Research, Hungarian Academy of Sciences, H-1525 Budapest, P.O. Box 49, Hungary
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20
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21
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Rodríguez EM, Fernández G, Alvarez PM, Beltrán FJ. TiO2 and Fe (III) photocatalytic ozonation processes of a mixture of emergent contaminants of water. WATER RESEARCH 2012; 46:152-166. [PMID: 22078252 DOI: 10.1016/j.watres.2011.10.038] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/29/2011] [Revised: 10/14/2011] [Accepted: 10/18/2011] [Indexed: 05/31/2023]
Abstract
A mixture of three emergent contaminants: testosterone (TST), bisphenol A (BPA) and acetaminophen (AAP) has been treated with different photocatalytic oxidation systems. Homogeneous catalysts as Fe(III) alone or complexed with oxalate or citrate ions, heterogeneous catalysts as titania, and oxidants such as hydrogen peroxide and/or ozone have been used to constitute the oxidation systems. For the radiation type, black light lamps mainly emitting at 365 nm have been used. The effects of pH (3 and 6.5) have been investigated due to the importance of this variable both in ozone and Fe(III) systems. Removal of initial compounds and mineralization (total organic carbon: TOC) were followed among other parameters. For the initial compounds removal ozonation alone, in many cases, allows the highest elimination rates, regardless of the presence or absence of UVA light and catalyst. For mineralization, however, ozone photocatalytic processes clearly leads to the highest oxidation rates.
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Affiliation(s)
- Eva M Rodríguez
- Departamento de Ingeniería Química y Química Física, Universidad de Extremadura, Avenida de Elvas S/N, 06006 Badajoz, Spain
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22
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Inhibition of the chlorinating activity of myeloperoxidase by tempol: revisiting the kinetics and mechanisms. Biochem J 2011; 439:423-31. [DOI: 10.1042/bj20110555] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The nitroxide tempol (4-hydroxy-2,2,6,6-tetramethyl piperidine-1-oxyl) reduces tissue injury in animal models of inflammation by mechanisms that are not completely understood. MPO (myeloperoxidase), which plays a fundamental role in oxidant production by neutrophils, is an important target for anti-inflammatory action. By amplifying the oxidative potential of H2O2, MPO produces hypochlorous acid and radicals through the oxidizing intermediates MPO-I [MPO-porphyrin•+-Fe(IV)=O] and MPO-II [MPO-porphyrin-Fe(IV)=O]. Previously, we reported that tempol reacts with MPO-I and MPO-II with second-order rate constants similar to those of tyrosine. However, we noticed that tempol inhibits the chlorinating activity of MPO, in contrast with tyrosine. Thus we studied the inhibition of MPO-mediated taurine chlorination by tempol at pH 7.4 and re-determined the kinetic constants of the reactions of tempol with MPO-I (k=3.5×105 M−1·s−1) and MPO-II, the kinetics of which indicated a binding interaction (K=2.0×10−5 M; k=3.6×10−2 s−1). Also, we showed that tempol reacts extremely slowly with hypochlorous acid (k=0.29 and 0.054 M−1·s−1 at pH 5.4 and 7.4 respectively). The results demonstrated that tempol acts mostly as a reversible inhibitor of MPO by trapping it as MPO-II and the MPO-II–tempol complex, which are not within the chlorinating cycle. After turnover, a minor fraction of MPO is irreversibly inactivated, probably due to its reaction with the oxammonium cation resulting from tempol oxidation. Kinetic modelling indicated that taurine reacts with enzyme-bound hypochlorous acid. Our investigation complements a comprehensive study reported while the present study was underway [Rees, Bottle, Fairfull-Smith, Malle, Whitelock and Davies (2009) Biochem. J. 421, 79–86].
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23
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Deng C, Ren C, Wu F, Deng N, Glebov EM, Pozdnyakov IP, Plyusnin VF. Montmorillonite KSF as catalyst for degradation of acetaminophen with heterogeneous Fenton reactions. REACTION KINETICS MECHANISMS AND CATALYSIS 2010. [DOI: 10.1007/s11144-010-0178-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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24
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Ismail FMD, Drew MGB, Navaratnam S, Bisby RH. A pulse radiolysis study of free radicals formed by one-electron oxidation of the antimalarial drug pyronaridine. RESEARCH ON CHEMICAL INTERMEDIATES 2009. [DOI: 10.1007/s11164-009-0051-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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25
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Litke AV, Pozdnyakov IP, Plyusnin VF, Grivin VP, Bazhin NM, Xue Z, Wu F, Deng N. Laser flash photolysis of aqueous acetaminophen solutions. HIGH ENERGY CHEMISTRY 2009. [DOI: 10.1134/s001814390901007x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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26
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Ataie G, Safarian S, Divsalar A, Saboury AA, Moosavi-Movahedi AA, Ranjbar B, Cristalli G, Mardanian S. Kinetic and structural analysis of the inhibition of adenosine deaminase by acetaminophen. J Enzyme Inhib Med Chem 2004; 19:71-8. [PMID: 15202496 DOI: 10.1080/14756360310001632741] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022] Open
Abstract
Kinetic and thermodynamic studies have been made on the effect of acetaminophen on the activity and structure of adenosine deaminase in 50 mM sodium phosphate buffer pH 7.5, at two temperatures of 27 and 37 degrees C using UV spectrophotometry, circular dichroism (CD) and fluorescence spectroscopy. Acetaminophen acts as a competitive inhibitor at 27 degrees C (Ki = 126 microM) and an uncompetitive inhibitor at 37 degrees C (Ki = 214 microM). Circular dichroism studies do not show any considerable effect on the secondary structure of adenosine deaminase by increasing the temperature from 27 to 37 degrees C. However, the secondary structure of the protein becomes more compact at 37 degrees C in the presence of acetaminophen. Fluorescence spectroscopy studies show considerable change in the tertiary structure of the protein by increasing the temperature from 27 to 37 degrees C. Also, the fluorescence spectrum of the protein incubated with different concentrations of acetaminophen show different inhibition behaviors by the effector at the two temperatures.
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Affiliation(s)
- G Ataie
- Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran
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27
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Reszka KJ, Britigan LH, Rasmussen GT, Wagner BA, Burns CP, Britigan BE. Acetaminophen stimulates the peroxidative metabolism of anthracyclines. Arch Biochem Biophys 2004; 427:16-29. [PMID: 15178484 DOI: 10.1016/j.abb.2004.04.012] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2004] [Revised: 04/09/2004] [Indexed: 11/29/2022]
Abstract
Acetaminophen, a common analgesic and antipyretic drug, is frequently administered to individuals undergoing anthracycline chemotherapy. Here, the effect of acetaminophen on the metabolism of daunorubicin and doxorubicin by isolated enzymes lactoperoxidase and myeloperoxidase, and by myeloperoxidase-containing human leukemia HL-60 cells was investigated using spectrophotometric and EPR techniques. We report that at pharmacological concentrations acetaminophen strongly stimulates oxidation of the anthracyclines by lactoperoxidase and myeloperoxidase systems, which results in irreversibly altered (colorless) products. The initial rate and efficacy of daunorubicin oxidation depends on pH. While at pH approximately 7 the oxidation is rapid and extensive, almost no oxidation occurs at pH approximately 5. In the absence of daunorubicin, oxidation of acetaminophen by lactoperoxidase/hydrogen peroxide is only weakly dependent on pH, however, at pH 7.4 it strongly depends on [daunorubicin]. Ascorbate and reduced glutathione strongly inhibited oxidation of anthracyclines by lactoperoxidase and HL-60 systems. Using EPR, a daunorubicin-derived radical was detected in a daunorubicin/acetaminophen/peroxidase/hydrogen peroxide system as a narrow single line (0.175 mT) with g = 2.0047. When daunorubicin was omitted, only an acetaminophen-melanin EPR signal was detected (g = 2.0043, line width approximately 0.5 mT). Similar results were obtained with doxorubicin. We suggest that the stimulation by acetaminophen is primarily due to its preferential oxidation by peroxidases to the corresponding phenoxyl radical, which subsequently reacts with daunorubicin (doxorubicin). Because biological properties of oxidatively transformed anthracyclines will certainly be different from those of their parent compounds, the possible acetaminophen-enhanced degradation of the anthracyclines in vivo is likely to interfere with anticancer and/or cardiotoxic activities of these agents.
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28
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Bisby RH, Arvanitidis M, Botchway SW, Clark IP, Parker AW, Tobin D. Investigation of multiphoton-induced fluorescence from solutions of 5-hydroxytryptophan. Photochem Photobiol Sci 2003; 2:157-62. [PMID: 12664978 DOI: 10.1039/b206848f] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
It is reported (J. B. S. Shear, C. Xu and W. W. Webb, Photochem. Photobiol. 1997, 65, 931) that multiphoton near infrared excitation of 5-hydroxytryptophan results in a transient product with green fluorescence. Visible fluorescence from multiphoton excitation enables detection of 5-hydroxytryptophan with extremely high sensitivity and also has potential applications in imaging of biological systems and investigation of protein dynamics. The characteristic fluorescence at 500 nm has now also been observed in a two laser experiment whereby 308 nm photolysis of the solution is followed by an excitation step at 430 nm. Fluorescence was observed in aerated and deaerated solutions and in the presence of ascorbate. Enhancement of fluorescence was observed on addition of ethanol. Transient absorption experiments with 308 nm photolysis showed the formation of three transient species. In the presence of ascorbate the radical formed by photoionisation was quenched, revealing a long-lived species (tau > 1 ms) with a similar absorption spectrum, which is ascribed to the fluorescing species. Fluorescence induced by multiphoton excitation had a lifetime of 910 +/- 10 ps and was also unaffected by ascorbate. In the presence of organic solvents there was an increase in fluorescence lifetime, but a decrease in overall fluorescence intensity. The fluorescence intensity and fluorescence lifetime both decreased in acidic solution (pH < 3). The results indicate that the fluorescence does not originate from the 5-indoxyl radical as previously suggested but from one or more other transient products which require further characterisation.
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Affiliation(s)
- Roger H Bisby
- Biosciences Research Institute, University of Salford, Salford, UK M5 4WT.
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29
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Bisby RH, Johnson SA, Parker AW. Radicals from One-Electron Oxidation of 4-Aminoresorcinol: Models for the Active Site Radical Intermediate in Copper Amine Oxidases. J Phys Chem B 2000. [DOI: 10.1021/jp000296v] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
- Roger H. Bisby
- Department of Biological Sciences, University of Salford, Salford M5 4WT, U.K
| | - Steven A. Johnson
- Department of Biological Sciences, University of Salford, Salford M5 4WT, U.K
| | - Anthony W. Parker
- Lasers for Science Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, OX11 OQX, U.K
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30
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Nelson SD. Mechanisms of the formation and disposition of reactive metabolites that can cause acute liver injury. Drug Metab Rev 1995; 27:147-77. [PMID: 7641574 DOI: 10.3109/03602539509029821] [Citation(s) in RCA: 138] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Acetaminophen and pulegone are just two examples for many agents that can form reactive metabolites that can cause acute liver injury. Two other classic organic compounds that have been extensively studied are carbon tetrachloride (for a recent review see Ref. 159, and for other discussions see Refs. 8 and 9) and bromobenzene (for review see Ref. 160). Different kinds of protein adducts of reactive metabolites of bromobenzene have been partially characterized [161], and specific antibodies to these adducts are now being used to isolate and identify the proteins that are modified (162). In contrast, carbon tetrachloride and other agents, such as the herbicide diquat, may form radicals that bind to and/or oxidize lipids and proteins in causing liver injury (163, 164). Therefore, the recent development [165] of antibodies to detect oxidative damage to proteins will be important in the identification and characterization of macromolecules that do not form adducts with reactive metabolites but are damaged oxidatively. Thus, some major challenges in the coming years are to identify hepatocellular macromolecules that are modified by reactive metabolites, and then approach the more difficult task of integrating this information into a time course and sequence of events leading to lethal hepatocellular injury.
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Affiliation(s)
- S D Nelson
- Department of Medicinal Chemistry, School of Pharmacy, University of Washington, Seattle 98195, USA
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31
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Cerretani D, Micheli L, Flaschi AI, Romeo MR, Taddei I, Giorgi G. MK-801 potentiates the glutathione depletion induced by acetaminophen in rat brain. Curr Ther Res Clin Exp 1994. [DOI: 10.1016/s0011-393x(05)80806-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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32
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Munday R. Bioactivation of thiols by one-electron oxidation. ADVANCES IN PHARMACOLOGY (SAN DIEGO, CALIF.) 1994; 27:237-70. [PMID: 8068555 DOI: 10.1016/s1054-3589(08)61035-2] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- R Munday
- Ruakura Agricultural Research Centre, Hamilton, New Zealand
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33
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Brent JA, Rumack BH. Role of free radicals in toxic hepatic injury. I. Free radical biochemistry. JOURNAL OF TOXICOLOGY. CLINICAL TOXICOLOGY 1993; 31:139-71. [PMID: 8433411 DOI: 10.3109/15563659309000383] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- J A Brent
- Rocky Mountain Poison and Drug Center, Denver, CO 80204
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34
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Abstract
One electron oxidation of the antimalarial drug amodiaquine by inorganic radicals was investigated by pulse radiolysis. A transient species was observed and identified as the semiiminoquinone radical, which has recently been implicated in the toxicity of amodiaquine. Pulse radiolysis was used to determine the reactivity of this radical. In the absence of other solutes it decays rapidly in a second order process. No reaction between the semiiminoquinone radical and oxygen could be observed. In the presence of ascorbate or a phenolic antioxidant (Trolox C) the semiiminoquinone radical was rapidly repaired. Similar reductants have been reported (Maggs JL et al., Biochem Pharmacol 37: 303-311, 1988) to inhibit irreverisble protein binding during amodiaquine autoxidation, and the present results support the involvement of the radical during these reactions.
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Affiliation(s)
- R H Bisby
- Department of Biological Sciences, University of Salford, U.K
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35
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Mason RP, Rao DN. Thiyl free radical metabolites of thiol drugs, glutathione, and proteins. Methods Enzymol 1990; 186:318-29. [PMID: 2172708 DOI: 10.1016/0076-6879(90)86125-f] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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36
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Lambert C, Chacon JN, Chedekel MR, Land EJ, Riley PA, Thompson A, Truscott TG. A pulse radiolysis investigation of the oxidation of indolic melanin precursors: evidence for indolequinones and subsequent intermediates. BIOCHIMICA ET BIOPHYSICA ACTA 1989; 993:12-20. [PMID: 2804118 DOI: 10.1016/0304-4165(89)90136-0] [Citation(s) in RCA: 62] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The rate constants associated with the series of successive transient absorptions initiated by one-electron oxidation of 5,6-dihydroxyindole (DHI), 5,6-dihydroxyindole-2-carboxylic acid (DHICA), precursors of melanin, and N-methyl-5,6-dihydroxyindole (NMDHI), a model compound, have been studied by pulse radiolysis. The initial transient species resulting from N3. oxidation reaction at pH 7.3-7.4 are assigned as the corresponding semiquinones. In each case, these radicals decayed, probably by disproportionation, into products most readily monitored in the 400-430 nm region. For DHI, the decay in this region could be fitted by two parent concentration independent first-order processes. These may correspond to transformations between 5,6-indolequinone, and its quinone-imine and quinone-methide tautomers. With NMDHI, on the other hand, a single longer-lived product with a peak around 430 nm predominated after decay of the corresponding radical, due almost certainly to N-methyl-5,6-indolequinone. The data appear to exclude significant melanin polymerisation by condensation of semiquinones, reaction of semiquinones with dihydroxyindoles, self-addition of indolequinones or tautomers, or reaction of indolequinones or tautomers with the parent dihydroxyindoles. It is suggested that polymerisation of melanin may rather occur by stepwise addition of indolequinone methide/imine to reduced oligomeric species.
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Affiliation(s)
- C Lambert
- Paterson Institute for Cancer Research, Christie Hospital and Holt Radium Institute, Manchester, UK
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