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Moon BC, Kim S, Jo YY, Park JH, Ko JK, Lee DK. Biocompatible Cu/NiMo Composite Electrocatalyst for Hydrogen Evolution Reaction in Microbial Electrosynthesis; Unveiling the Self-Detoxification Effect of Cu. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2024; 11:e2309775. [PMID: 38552158 PMCID: PMC11165482 DOI: 10.1002/advs.202309775] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2023] [Revised: 03/07/2024] [Indexed: 06/12/2024]
Abstract
H2-driven microbial electrosynthesis (MES) is an emerging bioelectrochemical technology that enables the production of complex compounds from CO2. Although the performance of microbial fermentation in the MES system is closely related to the H2 production rate, high-performing metallic H2-evolving catalysts (HEC) generate cytotoxic H2O2 and metal cations from undesirable side reactions, severely damaging microorganisms. Herein, a novel design for self-detoxifying metallic HEC, resulting in biologically benign H2 production, is reported. Cu/NiMo composite HEC suppresses H2O2 evolution by altering the O2 reduction kinetics to a four-electron pathway and subsequently decomposes the inevitably generated H2O2 in sequential catalytic and electrochemical pathways. Furthermore, in situ generated Cu-rich layer at the surface prevents NiMo from corroding and releasing cytotoxic Ni cations. Consequently, the Cu/NiMo composite HEC in the MES system registers a 50% increase in the performance of lithoautotrophic bacterium Cupriavidus necator H16, for the conversion of CO2 to a biopolymer, poly(3-hydroxybutyrate). This work successfully demonstrates the concept of self-detoxification in designing biocompatible materials for bioelectrochemical applications as well as MES systems.
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Affiliation(s)
- Byeong Cheul Moon
- Clean Energy Research CenterKorea Institute of Science and Technology (KIST)Seoul02792Republic of Korea
- Center for Water Cycle ResearchKorea Institute of Science and Technology (KIST)Seoul02792Republic of Korea
| | - Soyoung Kim
- Clean Energy Research CenterKorea Institute of Science and Technology (KIST)Seoul02792Republic of Korea
| | - Young Yoon Jo
- Clean Energy Research CenterKorea Institute of Science and Technology (KIST)Seoul02792Republic of Korea
| | - Jong Hyeok Park
- Department of Chemical and Biomolecular EngineeringYonsei‐KIST Convergence Research InstituteYonsei UniversitySeoul03722Republic of Korea
| | - Ja Kyong Ko
- Clean Energy Research CenterKorea Institute of Science and Technology (KIST)Seoul02792Republic of Korea
- Division of Energy and Environment TechnologyKIST SchoolUniversity of Science and TechnologySeoul02792Republic of Korea
| | - Dong Ki Lee
- Clean Energy Research CenterKorea Institute of Science and Technology (KIST)Seoul02792Republic of Korea
- Department of Chemical and Biomolecular EngineeringYonsei‐KIST Convergence Research InstituteYonsei UniversitySeoul03722Republic of Korea
- Graduate School of Energy and EnvironmentKorea UniversitySeoul02841Republic of Korea
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2
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Chaveanghong S, Kobkeatthawin T, Trakulmututa J, Amornsakchai T, Kajitvichyanukul P, Smith SM. Photocatalytic removal of 2-chlorophenol from water by using waste eggshell-derived calcium ferrite. RSC Adv 2023; 13:17565-17574. [PMID: 37313003 PMCID: PMC10258604 DOI: 10.1039/d3ra01357j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2023] [Accepted: 05/22/2023] [Indexed: 06/15/2023] Open
Abstract
A new approach to recycling low-value eggshell food waste was to produce a CaFe2O4 semiconductor with a narrow band gap (Eg = 2.81 eV) via hydrothermal treatments of powdered eggshell suspended in aqueous ferric salt (Fe3+) solutions at varying Fe loadings. It was possible to obtain a single phase of CaFe2O4 without any Ca(OH)2 and CaO impurities using an optimal Fe loading (30 wt% of Fe3+ by eggshell weight). The CaFe2O4 material was used as a photocatalyst for the breakdown of 2-chlorophenol (2-CP, a herbicide model chemical) as a pollutant in water. The CaFe2O4 with a Fe loading of 7.1 wt% exhibited a high 2-CP removal efficiency of 86.1% after 180 min of UV-visible light irradiation. Additionally, the eggshell-derived CaFe2O4 photocatalyst can be effectively reused, giving a high removal efficiency of 70.5% after the third cycle, without the requirement of regeneration processes (washing or re-calcination). Although radical trapping experiments confirmed that hydroxyl radicals were generated in the photocatalytic reactions, photogenerated holes play a significant role in the high 2-CP degradation efficiencies. The performance of the bioderived CaFe2O4 photocatalysts in the removal of pesticides from water demonstrated the benefits of resource recycling in the area of materials science and in environmental remediation and protection.
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Affiliation(s)
- Suwilai Chaveanghong
- Center of Sustainable Energy and Green Materials and Department of Chemistry, Faculty of Science, Mahidol University 999 Phuttamonthon Sai 4 Rd, Salaya Nakhon Pathom 73170 Thailand
- Mahidol University Frontier Research Facility, Mahidol University 999 Phuttamonthon Sai 4 Rd, Salaya Nakhon Pathom 73170 Thailand
| | - Thawanrat Kobkeatthawin
- Center of Sustainable Energy and Green Materials and Department of Chemistry, Faculty of Science, Mahidol University 999 Phuttamonthon Sai 4 Rd, Salaya Nakhon Pathom 73170 Thailand
| | - Jirawat Trakulmututa
- Center of Sustainable Energy and Green Materials and Department of Chemistry, Faculty of Science, Mahidol University 999 Phuttamonthon Sai 4 Rd, Salaya Nakhon Pathom 73170 Thailand
| | - Taweechai Amornsakchai
- Center of Sustainable Energy and Green Materials and Department of Chemistry, Faculty of Science, Mahidol University 999 Phuttamonthon Sai 4 Rd, Salaya Nakhon Pathom 73170 Thailand
| | - Puangrat Kajitvichyanukul
- Department of Environmental Engineering, Faculty of Engineering, Chiang Mai University 239, Huay Kaew Road, Muang District Chiang Mai 50200 Thailand
- Sustainable Engineering Research Center for Pollution and Environmental Management, Faculty of Engineering, Chiang Mai University 239, Huay Kaew Road, Muang District Chiang Mai 50200 Thailand
| | - Siwaporn Meejoo Smith
- Center of Sustainable Energy and Green Materials and Department of Chemistry, Faculty of Science, Mahidol University 999 Phuttamonthon Sai 4 Rd, Salaya Nakhon Pathom 73170 Thailand
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3
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Fiori I, Santacruz W, Dionisio D, Motheo AJ. Electro-oxidation of tetracycline in ethanol-water mixture using DSA-Cl 2 anode and stimulating/monitoring the formation of organic radicals. CHEMOSPHERE 2022; 308:136487. [PMID: 36156319 DOI: 10.1016/j.chemosphere.2022.136487] [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: 06/20/2022] [Revised: 08/25/2022] [Accepted: 09/14/2022] [Indexed: 06/16/2023]
Abstract
Recent studies reported a new strategy of electro-oxidation of organic compounds using methanol as solvent. Considering its well-known toxicity, this work sought to evaluate the use of ethanol as an alternative solvent for pollutants degradation. Therefore, thorough analyses were performed in order to evaluate tetracycline (TC) electro-oxidation using DSA-Cl2 anode in ethanol-H2O solutions. The effects of solvent mixture, pH and current density on the degradation efficiency were evaluated. TC degradation in methanol-water and ethanol-water media resulted in very close removals of 95% and 90%, respectively, after 15 min of electrolysis at 10 mA cm-2. In ethanol medium, the increase in current densities from 10 to 25 mA cm-2 did not lead to significant changes in removal efficiency. The variation of the initial pH of the solution showed that the best removal efficiencies were obtained at neutral pH resulting in TC removals up to 90%, which is actually related to the molecular structure of TC. Through analysis using electron paramagnetic resonance (EPR), the formation of radicals such as hydroxyethyl (CH3●CHOH), hydroxyl (●OH) and ethoxy (CH3CH2O●) were detected, which effectively contributed toward the pollutant oxidation.
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Affiliation(s)
- Isabela Fiori
- São Carlos Institute of Chemistry, University of São Paulo, P.O. Box 780, CEP, São Carlos, SP, 13560-970, Brazil
| | - William Santacruz
- São Carlos Institute of Chemistry, University of São Paulo, P.O. Box 780, CEP, São Carlos, SP, 13560-970, Brazil
| | - Dawany Dionisio
- São Carlos Institute of Chemistry, University of São Paulo, P.O. Box 780, CEP, São Carlos, SP, 13560-970, Brazil
| | - Artur J Motheo
- São Carlos Institute of Chemistry, University of São Paulo, P.O. Box 780, CEP, São Carlos, SP, 13560-970, Brazil.
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4
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Hao M, Qin Y, Shen J, Wang B, Li Z. Visible-Light-Initiated Acceptor-Less Dehydrogenation of Alcohols to Vicinal Diols over UiO-66(Zr): Surface Complexation and Role of Bridging Hydroxyl. ACS Catal 2022. [DOI: 10.1021/acscatal.2c04364] [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]
Affiliation(s)
- Mingming Hao
- Research Institute of Photocatalysis, State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fuzhou 350116, P. R. China
| | - Yuhuan Qin
- Research Institute of Photocatalysis, State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fuzhou 350116, P. R. China
| | - Jiexuan Shen
- Research Institute of Photocatalysis, State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fuzhou 350116, P. R. China
| | - Bingqing Wang
- College of Chemical Engineering and Materials Science, Quanzhou Normal University, Quanzhou 362000, P. R. China
| | - Zhaohui Li
- Research Institute of Photocatalysis, State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fuzhou 350116, P. R. China
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5
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Santacruz W, Fiori I, de Mello R, Motheo AJ. Detection of radicals produced during electro-oxidation of atrazine using commercial DSA®-Cl 2 in methanol media: Keys to understand the process. CHEMOSPHERE 2022; 307:136157. [PMID: 36029853 DOI: 10.1016/j.chemosphere.2022.136157] [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: 07/05/2022] [Revised: 08/17/2022] [Accepted: 08/19/2022] [Indexed: 06/15/2023]
Abstract
This work reports the radicals detected and identified during the degradation of atrazine in methanol medium in the presence and absence of different proportions of water (0%, 5%, and 10%). The determination of these radicals is an important step to understand the electrolysis processes in methanol medium and contribute to clarify the degradation mechanism. Furthermore, the parameters for the successful removal of the contaminant were optimized and the results showed that the application of the technique led to the removal of nearly 99.8% of atrazine after 1 h of electrolysis. The oxidation kinetics was found to be very fast and most of the atrazine molecule in the medium was degraded in the first hour of electrolysis. The results obtained from a thorough analysis conducted with a view to evaluating the effects of different current densities and initial pH values on atrazine degradation showed that the application of higher current densities resulted in lower energy consumption, as this led to faster removal of atrazine. Additionally, the initial pH of the solution was found to favor the formation of different species of active chlorine. The radicals formed during the electro-oxidation process were detected by electron paramagnetic resonance spectroscopy and include hydroxyl, methoxy and hydroxymethyl. The use of methanol for the degradation of pollutants is a highly promising technique and this work shows that the identification of the different radicals formed in the process can be the key to understanding the degradation mechanism.
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Affiliation(s)
- William Santacruz
- São Carlos Institute of Chemistry, University of São Paulo, P.O. Box 780, CEP 13560-970. São Carlos, SP, Brazil
| | - Isabela Fiori
- São Carlos Institute of Chemistry, University of São Paulo, P.O. Box 780, CEP 13560-970. São Carlos, SP, Brazil
| | - Rodrigo de Mello
- São Carlos Institute of Chemistry, University of São Paulo, P.O. Box 780, CEP 13560-970. São Carlos, SP, Brazil
| | - Artur J Motheo
- São Carlos Institute of Chemistry, University of São Paulo, P.O. Box 780, CEP 13560-970. São Carlos, SP, Brazil.
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6
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Fighting Antibiotic-Resistant Bacterial Infections by Surface Biofunctionalization of 3D-Printed Porous Titanium Implants with Reduced Graphene Oxide and Silver Nanoparticles. Int J Mol Sci 2022; 23:ijms23169204. [PMID: 36012467 PMCID: PMC9409238 DOI: 10.3390/ijms23169204] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2022] [Revised: 08/10/2022] [Accepted: 08/11/2022] [Indexed: 11/16/2022] Open
Abstract
Nanoparticles (NPs) have high multifunctional potential to simultaneously enhance implant osseointegration and prevent infections caused by antibiotic-resistant bacteria. Here, we present the first report on using plasma electrolytic oxidation (PEO) to incorporate different combinations of reduced graphene oxide (rGO) and silver (Ag) NPs on additively manufactured geometrically ordered volume-porous titanium implants. The rGO nanosheets were mainly embedded parallel with the PEO surfaces. However, the formation of ‘nano-knife’ structures (particles embedded perpendicularly to the implant surfaces) was also found around the pores of the PEO layers. Enhanced in vitro antibacterial activity against methicillin-resistant Staphylococcus aureus was observed for the rGO+Ag-containing surfaces compared to the PEO surfaces prepared only with AgNPs. This was caused by a significant improvement in the generation of reactive oxygen species, higher levels of Ag+ release, and the presence of rGO ‘nano-knife’ structures. In addition, the implants developed in this study stimulated the metabolic activity and osteogenic differentiation of MC3T3-E1 preosteoblast cells compared to the PEO surfaces without nanoparticles. Therefore, the PEO titanium surfaces incorporating controlled levels of rGO+Ag nanoparticles have high clinical potential as multifunctional surfaces for 3D-printed orthopaedic implants.
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7
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Yan Y, Jiang N, Liu X, Pan J, Li M, Wang C, Camargo PHC, Wang J. Enhanced Spontaneous Antibacterial Activity of δ-MnO 2 by Alkali Metals Doping. Front Bioeng Biotechnol 2022; 9:788574. [PMID: 35059387 PMCID: PMC8764136 DOI: 10.3389/fbioe.2021.788574] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2021] [Accepted: 11/15/2021] [Indexed: 11/29/2022] Open
Abstract
Recently, the widespread use of antibiotics is becoming a serious worldwide public health challenge, which causes antimicrobial resistance and the occurrence of superbugs. In this context, MnO2 has been proposed as an alternative approach to achieve target antibacterial properties on Streptococcus mutans (S. mutans). This requires a further understanding on how to control and optimize antibacterial properties in these systems. We address this challenge by synthesizing δ-MnO2 nanoflowers doped by magnesium (Mg), sodium (Na), and potassium (K) ions, thus displaying different bandgaps, to evaluate the effect of doping on the bacterial viability of S. mutans. All these samples demonstrated antibacterial activity from the spontaneous generation of reactive oxygen species (ROS) without external illumination, where doped MnO2 can provide free electrons to induce the production of ROS, resulting in the antibacterial activity. Furthermore, it was observed that δ-MnO2 with narrower bandgap displayed a superior ability to inhibit bacteria. The enhancement is mainly attributed to the higher doping levels, which provided more free electrons to generate ROS for antibacterial effects. Moreover, we found that δ-MnO2 was attractive for in vivo applications, because it could nearly be degraded into Mn ions completely following the gradual addition of vitamin C. We believe that our results may provide meaningful insights for the design of inorganic antibacterial nanomaterials.
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Affiliation(s)
- Yali Yan
- College of Science, Donghua University, Shanghai, China
| | - Ning Jiang
- Department of Oral and Craniomaxillofacial Science, Shanghai Key Laboratory of Stomatology, College of Stomatology, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Xin Liu
- Department of Dental Materials, Shanghai Key Laboratory of Stomatology, Shanghai Biomaterials Research and Testing Center, National Center for Stomatology, National Clinical Research Center for Oral Diseases, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, College of Stomatology, Shanghai Jiao Tong University, Shanghai, China
| | - Jie Pan
- Department of Orthodontics, Shanghai Stomatological Hospital, Fudan University, Shanghai, China.,Shanghai Key Laboratory of Craniomaxillofacial Development and Diseases, Fudan University, Shanghai, China
| | - Mai Li
- College of Science, Donghua University, Shanghai, China
| | - Chunrui Wang
- College of Science, Donghua University, Shanghai, China
| | | | - Jiale Wang
- College of Science, Donghua University, Shanghai, China.,Shanghai Institute of Intelligent Electronics and Systems, Donghua University, Shanghai, China
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8
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Chen ZH, Li YH, Qi MY, Tang ZR, Xu YJ. Benzyl alcohol oxidation and hydrogen generation over MoS2/ZnIn2S4 composite photocatalyst. RESEARCH ON CHEMICAL INTERMEDIATES 2022. [DOI: 10.1007/s11164-021-04636-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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9
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Helicobacter pylori FabX contains a [4Fe-4S] cluster essential for unsaturated fatty acid synthesis. Nat Commun 2021; 12:6932. [PMID: 34836944 PMCID: PMC8626469 DOI: 10.1038/s41467-021-27148-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2021] [Accepted: 10/29/2021] [Indexed: 11/08/2022] Open
Abstract
Unsaturated fatty acids (UFAs) are essential for functional membrane phospholipids in most bacteria. The bifunctional dehydrogenase/isomerase FabX is an essential UFA biosynthesis enzyme in the widespread human pathogen Helicobacter pylori, a bacterium etiologically related to 95% of gastric cancers. Here, we present the crystal structures of FabX alone and in complexes with an octanoyl-acyl carrier protein (ACP) substrate or with holo-ACP. FabX belongs to the nitronate monooxygenase (NMO) flavoprotein family but contains an atypical [4Fe-4S] cluster absent in all other family members characterized to date. FabX binds ACP via its positively charged α7 helix that interacts with the negatively charged α2 and α3 helices of ACP. We demonstrate that the [4Fe-4S] cluster potentiates FMN oxidation during dehydrogenase catalysis, generating superoxide from an oxygen molecule that is locked in an oxyanion hole between the FMN and the active site residue His182. Both the [4Fe-4S] and FMN cofactors are essential for UFA synthesis, and the superoxide is subsequently excreted by H. pylori as a major resource of peroxide which may contribute to its pathogenic function in the corrosion of gastric mucosa.
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10
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Sergeev A, Motyakin M, Barashkova I, Zaborova V, Krasulya O, Yusof NSM. EPR and NMR study of molecular components mobility and organization in goat milk under ultrasound treatment. ULTRASONICS SONOCHEMISTRY 2021; 77:105673. [PMID: 34311321 PMCID: PMC8326184 DOI: 10.1016/j.ultsonch.2021.105673] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/14/2021] [Revised: 07/10/2021] [Accepted: 07/13/2021] [Indexed: 06/13/2023]
Abstract
The effect of ultrasound treatment on molecular mobility and organization of the main components in raw goat milk was studied by EPR and NMR spectroscopies. NMR relaxation studies showed an increase in the spin-lattice T1 and spin-spin T2 relaxation times in goat milk products (cream, anhydrous fat) and change in the diffusion of proton-containing molecules during ultrasound treatment. The diffusion became more uniform and could be rather accurately approximated by one effective diffusion coefficient Deff, which indicates homogenization of goat milk components, dispersion of globular and supermicellar formations under sonication. EPR studies have shown that molecular mobility and organization of hydrophobic regions in goat milk are similar to those observed in micellar formations of surfactants with a hydrocarbon chain length C12-C16. Ultrasound treatment did not affect submicellar and protein globule organization. Free radicals arising under ultrasound impact of milk reacted quickly with components of goat milk (triglycerides, proteins, fatty acids) and were not observed by spin trapping method.
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Affiliation(s)
- Andrey Sergeev
- N.N. Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences, Moscow 119991 Russia
| | - Mikhail Motyakin
- N.N. Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences, Moscow 119991 Russia; Emanuel Institute of Biochemical Physics, Russian Academy of Sciences, Moscow 119334 Russia
| | - Irina Barashkova
- N.N. Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences, Moscow 119991 Russia
| | - Victoria Zaborova
- Sechenov First Moscow State Medical University, Moscow 119991 Russia; Moscow Institute of Physics and Technology (National Research University), Moscow Region 141700 Russia
| | - Olga Krasulya
- Russian State Agrarian University-Moscow Agricultural Timiryazev Academy, Moscow 127550 Russia
| | - Nor Saadah M Yusof
- Department of Chemistry, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia.
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11
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Coral JA, Kitchens CL, Brumaghim JL, Klaine SJ. Correlating Quantitative Measurements of Radical Production by Photocatalytic TiO 2 with Daphnia magna Toxicity. ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY 2021; 40:1322-1334. [PMID: 33439484 DOI: 10.1002/etc.4982] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2020] [Revised: 09/01/2020] [Accepted: 01/07/2021] [Indexed: 06/12/2023]
Abstract
Increased use of titanium dioxide (TiO2 ) nanoparticles (NPs) in domestic and industrial applications has increased the risk for adverse environmental outcomes based on an elevated likelihood of organism exposure. Anatase TiO2 NP exposure to ultraviolet A (UV-A) radiation in aquatic environments generates radical oxygen species (ROS), which may ultimately be responsible for increased organism toxicity. We have identified and measured the 2 most relevant ROS species, hydroxyl and superoxide radicals, and described that ROS can be modeled using the highly reactive hydroxyl radical to provide an upper bound for toxicity. The TiO2 NPs were co-exposed to increasing natural organic matter (NOM) amounts (measured as concentration of dissolved organic carbon [DOC]) and simulated-sunlight UV-A intensities. Radical production rate was determined using fluorescence spectroscopy and was positively correlated with increases in TiO2 concentration and UV-A intensity, and negatively correlated with increased DOC concentration. Daphnia magna toxicity was also found to decrease with NOM addition, which is attributed to the decreased radical production rate with increased DOC concentrations. We demonstrate that the rate of ROS production from simulated-sunlight-irradiated TiO2 NPs can be quantified using relatively simple fluorescent techniques. We show that toxicity to TiO2 NP varies greatly with conditions, and that concentration alone is a poor predictor of toxicity. Describing toxicity/hydroxyl radical measurement may be a more accurate way to describe overall risk. We provide a framework for a simple model to describe toxicity/hydroxyl radical. These conclusions demonstrate the importance of considering exposure conditions as a means of risk management during TiO2 NP toxicity testing, waste management, and regulatory decisions. Environ Toxicol Chem 2021;40:1322-1334. © 2021 SETAC.
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Affiliation(s)
- Jason A Coral
- Institute of Environmental Toxicology, Clemson University, Pendleton, South Carolina, USA
| | - Christopher L Kitchens
- Institute of Environmental Toxicology, Clemson University, Pendleton, South Carolina, USA
- Department of Chemical and Biomolecular Engineering, Clemson University, Clemson, South Carolina, USA
| | - Julia L Brumaghim
- Department of Chemistry, Clemson University, Clemson, South Carolina, USA
| | - Stephen J Klaine
- Department of Chemical and Biomolecular Engineering, Clemson University, Clemson, South Carolina, USA
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12
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Methane coupling and hydrogen evolution induced by palladium-loaded gallium oxide photocatalysts in the presence of water vapor. J Catal 2021. [DOI: 10.1016/j.jcat.2021.03.024] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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13
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Szajdzińska-Piętek E, Kruczała K, Benvenuto M. Memorial Viewpoint for Shulamith Schlick. J Phys Chem B 2020; 124:10598-10600. [DOI: 10.1021/acs.jpcb.0c09035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ewa Szajdzińska-Piętek
- Institute of Applied Radiation Chemistry, Lodz University of Technology, Wróblewskiego 15, 93-590 Łódź, Poland
| | - Krzysztof Kruczała
- Faculty of Chemistry, Jagiellonian University in Krakow, Gronostajowa 2, 30-387 Kraków, Poland
| | - Mark Benvenuto
- Department of Chemistry & Biochemistry, University of Detroit Mercy, Detroit, Michigan 48221-3038, United States
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14
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Kawano A, Yamasaki R, Sakakura T, Takatsuji Y, Haruyama T, Yoshioka Y, Ariyoshi W. Reactive Oxygen Species Penetrate Persister Cell Membranes of Escherichia coli for Effective Cell Killing. Front Cell Infect Microbiol 2020; 10:496. [PMID: 33042869 PMCID: PMC7530241 DOI: 10.3389/fcimb.2020.00496] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2019] [Accepted: 08/10/2020] [Indexed: 02/05/2023] Open
Abstract
Persister cells are difficult to eliminate because they are tolerant to antibiotic stress. In the present study, using artificially induced Escherichia coli persister cells, we found that reactive oxygen species (ROS) have greater effects on persister cells than on exponential cells. Thus, we examined which types of ROS could effectively eliminate persister cells and determined the mechanisms underlying the effects of these ROS. Ultraviolet (UV) light irradiation can kill persister cells, and bacterial viability is markedly increased under UV shielding. UV induces the production of ROS, which kill bacteria by moving toward the shielded area. Electron spin resonance-based analysis confirmed that hydroxyl radicals are produced by UV irradiation, although singlet oxygen is not produced. These results clearly revealed that ROS sterilizes persister cells more effectively compared to the sterilization of exponential cells (**p < 0.01). These ROS do not injure the bacterial cell wall but rather invade the cell, followed by cell killing. Additionally, the sterilization effect on persister cells was increased by exposure to oxygen plasma during UV irradiation. However, vapor conditions decreased persister cell sterilization by reducing the levels of hydroxyl radicals. We also verified the effect of ROS against bacteria in biofilms that are more resistant than planktonic cells. Although UV alone could not completely sterilize the biofilm bacteria, UV with ROS achieved complete sterilization. Our results demonstrate that persister cells strongly resist the effects of antibiotics and starvation stress but are less able to withstand exposure to ROS. It was shown that ROS does not affect the cell membrane but penetrates it and acts internally to kill persister cells. In particular, it was clarified that the hydroxy radical is an effective sterilizer to kill persister cells.
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Affiliation(s)
- Aki Kawano
- Division of Infections and Molecular Biology, Department of Health Promotion, Kyushu Dental University, Kitakyushu, Japan
| | - Ryota Yamasaki
- Division of Infections and Molecular Biology, Department of Health Promotion, Kyushu Dental University, Kitakyushu, Japan
| | - Tatsuya Sakakura
- Division of Functional Interface Engineering, Department of Biological Systems and Engineering, Kyushu Institute of Technology, Kitakyushu, Japan
| | - Yoshiyuki Takatsuji
- Division of Functional Interface Engineering, Department of Biological Systems and Engineering, Kyushu Institute of Technology, Kitakyushu, Japan
| | - Tetsuya Haruyama
- Division of Functional Interface Engineering, Department of Biological Systems and Engineering, Kyushu Institute of Technology, Kitakyushu, Japan
| | - Yoshie Yoshioka
- Division of Infections and Molecular Biology, Department of Health Promotion, Kyushu Dental University, Kitakyushu, Japan
| | - Wataru Ariyoshi
- Division of Infections and Molecular Biology, Department of Health Promotion, Kyushu Dental University, Kitakyushu, Japan
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15
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Photocatalytic activity of SnO2-TiO2 composite nanoparticles modified with PVP. J Colloid Interface Sci 2019; 542:296-307. [DOI: 10.1016/j.jcis.2019.02.026] [Citation(s) in RCA: 44] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2018] [Revised: 02/01/2019] [Accepted: 02/06/2019] [Indexed: 10/27/2022]
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16
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Bao J, Yang G, Yoneyama Y, Tsubaki N. Significant Advances in C1 Catalysis: Highly Efficient Catalysts and Catalytic Reactions. ACS Catal 2019. [DOI: 10.1021/acscatal.8b03924] [Citation(s) in RCA: 166] [Impact Index Per Article: 33.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jun Bao
- National Synchrotron Radiation Laboratory, Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes, University of Science and Technology of China, Hefei 230029, P.R. China
| | - Guohui Yang
- Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan, P.R. China
| | - Yoshiharu Yoneyama
- Department of Applied Chemistry, School of Engineering, University of Toyama, Gofuku 3190, Toyama 930-8555, Japan
| | - Noritatsu Tsubaki
- Department of Applied Chemistry, School of Engineering, University of Toyama, Gofuku 3190, Toyama 930-8555, Japan
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17
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Yang X, Yang Z, Liu Z, Zhang W, Wang D. Enhanced mineralization of hypersaline wastewater with Fe 2+/Cu 2+ catalyzed UV-Fenton process: process optimization and catalytic mechanism. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2018; 78:1219-1227. [PMID: 30339546 DOI: 10.2166/wst.2018.390] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The efficiency of Fenton oxidation was inhibited by the high content of salt in the industrial wastewater. However, enhanced mineralization of hypersaline industrial wastewater is necessary for advanced treatment and subsequent wastewater salt recovery process. Therefore, Fe2+ and Cu2+ catalyzed UV-Fenton oxidation were carried out to improve the total organic carbon (TOC) removal efficiency for a hypersaline wastewater from resin manufacturing. The performance of UV-Fe/Cu-Fenton oxidation was comparatively investigated and optimized using response surface methodology (RSM) to develop a practical high-efficient mineralization treatment technique for hypersaline wastewater. More than 90% of TOC was removed under optimal conditions of UV-Fe2+ and UV-Cu2+-Fenton oxidation, namely 9.6 mM Fe2+ and 176 mM H2O2, and 2.95 mM Cu2+ and 276 mM H2O2, respectively. The reactive oxygen radicals identified using electron spin resonance (ESR) spectroscopy revealed that hydroxyl radical was dominant oxidant in UV-Fe2+-Fenton process, while HO2·/O2·- played a more important role in the UV-Cu-Fenton system. The Cl- effect is also different for UV Fe and Cu Fenton. Moreover, no scaling and sludge problem makes UV-Cu-Fenton a promising alternative method for efficient mineralization of hypersaline industrial wastewater.
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Affiliation(s)
- Xiaofang Yang
- State Key Laboratory of Environmental Aquatic Chemistry, Research Centre for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China E-mail:
| | - Zhaoyi Yang
- State Key Laboratory of Environmental Aquatic Chemistry, Research Centre for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China E-mail:
| | - Zhen Liu
- School of Environmental Studies, China University of Geosciences, Wuhan 430074, Hubei, China
| | - Weijun Zhang
- School of Environmental Studies, China University of Geosciences, Wuhan 430074, Hubei, China
| | - Dongsheng Wang
- State Key Laboratory of Environmental Aquatic Chemistry, Research Centre for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China E-mail: ; School of Environmental Studies, China University of Geosciences, Wuhan 430074, Hubei, China
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18
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Jiang D, Chen X, Zhang Z, Zhang L, Wang Y, Sun Z, Irfan RM, Du P. Highly efficient simultaneous hydrogen evolution and benzaldehyde production using cadmium sulfide nanorods decorated with small cobalt nanoparticles under visible light. J Catal 2018. [DOI: 10.1016/j.jcat.2017.10.019] [Citation(s) in RCA: 72] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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19
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Sono M, Kinashi K, Sakai W, Tsutsumi N. Spin-Trapping Analysis of Thermal Degradation Reaction of Poly(butylene terephthalate). Macromolecules 2016. [DOI: 10.1021/acs.macromol.6b01942] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Masayo Sono
- Faculty of Materials Science & Engineering, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan
| | - Kenji Kinashi
- Faculty of Materials Science & Engineering, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan
| | - Wataru Sakai
- Faculty of Materials Science & Engineering, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan
| | - Naoto Tsutsumi
- Faculty of Materials Science & Engineering, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan
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20
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Fontmorin JM, Burgos Castillo RC, Tang WZ, Sillanpää M. Stability of 5,5-dimethyl-1-pyrroline-N-oxide as a spin-trap for quantification of hydroxyl radicals in processes based on Fenton reaction. WATER RESEARCH 2016; 99:24-32. [PMID: 27132196 DOI: 10.1016/j.watres.2016.04.053] [Citation(s) in RCA: 134] [Impact Index Per Article: 16.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/15/2016] [Revised: 04/16/2016] [Accepted: 04/20/2016] [Indexed: 05/27/2023]
Abstract
Fenton reaction was used to produce hydroxyl radicals under conditions similar to AOPs with 5,5-dimethyl-1-pyrroline-N-oxide (DMPO) as a spin trap agent in electron paramagnetic resonance (EPR) analysis. A theoretical kinetics model was developed to determine conditions under which the spin-adduct DMPO-OH is not further oxidized by Fe(3+) and excessive radicals, so that hydroxyl radicals concentration could be accurately inferred. Experiments were designed based upon the model and H2O2 and Fe(2+) concentrations were varied from 1 to 100 mM and from 0.1 to 10 mM, respectively, with a constant H2O2: Fe(2+) ratio of 10:1. Results confirmed that DMPO concentration should be at least 20 times higher than the concentration of H2O2 and 200 times higher than iron concentration to produce stable DMPO-OH EPR signal. When DMPO: H2O2 ratio varied from 1 to 10, DMPO-OH could generate intermediates and be further oxidized leading to the apparition of an additional triplet. This signal was attributed to a paramagnetic dimer: its structure and a formation mechanism were proposed. Finally, the utilization of sodium sulfite and catalase to terminate Fenton reaction was discussed. Catalase appeared to be compatible with DMPO. However, sodium sulfite should be avoided since it reacted with DMPO-OH to form DMPO-SO3.
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Affiliation(s)
- J M Fontmorin
- Laboratory of Green Chemistry, School of Engineering Science, Lappeenranta University of Technology, Sammonkatu 12, FI-50130 Mikkeli, Finland.
| | - R C Burgos Castillo
- Laboratory of Green Chemistry, School of Engineering Science, Lappeenranta University of Technology, Sammonkatu 12, FI-50130 Mikkeli, Finland
| | - W Z Tang
- Department of Civil and Environmental Engineering, Florida International University, Miami, FL 33174, USA
| | - M Sillanpää
- Laboratory of Green Chemistry, School of Engineering Science, Lappeenranta University of Technology, Sammonkatu 12, FI-50130 Mikkeli, Finland
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21
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Zhang J, Wu Y, Qin C, Liu L, Lan Y. Rapid degradation of aniline in aqueous solution by ozone in the presence of zero-valent zinc. CHEMOSPHERE 2015; 141:258-264. [PMID: 26291911 DOI: 10.1016/j.chemosphere.2015.07.066] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2015] [Revised: 07/25/2015] [Accepted: 07/29/2015] [Indexed: 06/04/2023]
Abstract
The effects of Zn(0) dosage from 0.1 to 1.3gL(-1), pH from 2 to 12 and temperature from 288 to 318K on the degradation of aniline in aqueous solution by ozone in the presence of Zn(0) were investigated through batch experiments. The results demonstrated that Zn(0) had a significantly synergistic role in the degradation of aniline by ozone. A complete decomposition of the initial aniline (10mgL(-1)) was achieved by ozone together with Zn(0) within 25min, and meanwhile nearly 70% of the total organic carbon in the solution was removed. The decomposition efficiency of aniline markedly increased with an increase of Zn(0) dosage. However, temperature exerted a slight impact on the degradation of aniline and the optimum removal efficiency of aniline was realized at 298K. Aniline was efficiently degraded at all the tested pHs except for 12. Free radicals were investigated by electron paramagnetic resonance technique and free radical scavengers. H2O2 concentration generated during the reactions was analyzed using a photometric method. Based on the results obtained in this study, it is proposed that O2(-) instead of OH is the dominant active species responsible for the degradation of aniline. It is concluded that ozone combined with Zn(0) is an effective and promising approach to the degradation of organic pollutants.
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Affiliation(s)
- Jing Zhang
- College of Sciences, Nanjing Agricultural University, Nanjing 210095, PR China
| | - Yao Wu
- College of Sciences, Nanjing Agricultural University, Nanjing 210095, PR China
| | - Chao Qin
- College of Sciences, Nanjing Agricultural University, Nanjing 210095, PR China
| | - Liping Liu
- College of Sciences, Nanjing Agricultural University, Nanjing 210095, PR China
| | - Yeqing Lan
- College of Sciences, Nanjing Agricultural University, Nanjing 210095, PR China.
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22
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Su H, Liu DD, Zhao M, Hu WL, Xue SS, Cao Q, Le XY, Ji LN, Mao ZW. Dual-Enzyme Characteristics of Polyvinylpyrrolidone-Capped Iridium Nanoparticles and Their Cellular Protective Effect against H2O2-Induced Oxidative Damage. ACS APPLIED MATERIALS & INTERFACES 2015; 7:8233-8242. [PMID: 25826467 DOI: 10.1021/acsami.5b01271] [Citation(s) in RCA: 89] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Polyvinylpyrrolidone-stabilized iridium nanoparticles (PVP-IrNPs), synthesized by the facile alcoholic reduction method using abundantly available PVP as protecting agents, were first reported as enzyme mimics showing intrinsic catalase- and peroxidase-like activities. The preparation procedure was much easier and more importantly, kinetic studies found that the catalytic activity of PVP-IrNPs was comparable to previously reported platinum nanoparticles. Transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) characterization indicated that PVP-IrNPs had the average size of approximately 1.5 nm and mainly consisted of Ir(0) chemical state. The mechanism of PVP-IrNPs' dual-enzyme activities was investigated using XPS, Electron spin resonance (ESR) and cytochrome C-based electron transfer methods. The catalase-like activity was related to the formation of oxidized species Ir(0)@IrO2 upon reaction with H2O2. The peroxidase-like activity originated from their ability acting as electron transfer mediators during the catalysis cycle, without the production of hydroxyl radicals. Interestingly, the protective effect of PVP-IrNPs against H2O2-induced cellular oxidative damage was investigated in an A549 lung cancer cell model and PVP-IrNPs displayed excellent biocompatibility and antioxidant activity. Upon pretreatment of cells with PVP-IrNPs, the intracellular reactive oxygen species (ROS) level in response to H2O2 was decreased and the cell viability increased. This work will facilitate studies on the mechanism and biomedical application of nanomaterials-based enzyme mimic.
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Affiliation(s)
- Hua Su
- †MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275, P. R. China
| | - Dan-Dan Liu
- ‡Department of Applied Chemistry, South China Agricultural University, Guangzhou 510642, P. R. China
| | - Meng Zhao
- †MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275, P. R. China
| | - Wei-Liang Hu
- †MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275, P. R. China
| | - Shan-Shan Xue
- †MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275, P. R. China
| | - Qian Cao
- †MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275, P. R. China
| | - Xue-Yi Le
- ‡Department of Applied Chemistry, South China Agricultural University, Guangzhou 510642, P. R. China
| | - Liang-Nian Ji
- †MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275, P. R. China
| | - Zong-Wan Mao
- †MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275, P. R. China
- ‡Department of Applied Chemistry, South China Agricultural University, Guangzhou 510642, P. R. China
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23
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Bosnjakovic A, Danilczuk M, Schlick S, Xiong PN, Haugen GM, Hamrock SJ. An attempt to generate anion exchange membranes by amination of the perfluorinated 3M precursor leads to the hydrolysis of the precursor. J Memb Sci 2014. [DOI: 10.1016/j.memsci.2014.05.023] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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24
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Makarova K, Łastawska K, Wagner D, Wawer I. ESR study of spin trapping in Fenton media in the presence of taxifolin. J Mol Struct 2014. [DOI: 10.1016/j.molstruc.2014.03.010] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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25
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Chen L, Mizukado J, Suzuki Y, Kutsuna S, Aoyama Y, Yoshida Y, Suda H. An ESR study on superoxide radical anion generation and its involvement in the photooxidative degradation of poly-3-hexylthiophene in chlorobenzene solution. Chem Phys Lett 2014. [DOI: 10.1016/j.cplett.2014.05.030] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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26
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Ghassemzadeh L, Peckham TJ, Weissbach T, Luo X, Holdcroft S. Selective formation of hydrogen and hydroxyl radicals by electron beam irradiation and their reactivity with perfluorosulfonated acid ionomer. J Am Chem Soc 2013; 135:15923-32. [PMID: 24074044 DOI: 10.1021/ja408032p] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Selective formation and reactivity of hydrogen (H(•)) and hydroxyl (HO(•)) radicals with perfluorinated sulfonated ionomer membrane, Nafion 211, is described. Selective formation of radicals was achieved by electron beam irradiation of aqueous solutions of H2O2 or H2SO4 to form HO(•) and H(•), respectively, and confirmed by ESR spectroscopy using a spin trap. The structure of Nafion 211 after reaction with H(•) or HO(•) was determined using calibrated (19)F magic angle spinning NMR spectroscopy. Soluble residues of degradation were analyzed by liquid and solid-state NMR. NMR and ATR-FTIR spectroscopy, together with determination of ion exchange capacity, water uptake, proton conductivity, and fluoride ion release, strongly indicate that attack by H(•) occurs at the tertiary carbon C-F bond on both the main and side chain; whereas attack by HO(•) occurs solely on the side chain, specifically, the α-O-C bond.
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Affiliation(s)
- Lida Ghassemzadeh
- Department of Chemistry, Simon Fraser University , 8888 University Drive, Burnaby, British Columbia, Canada V5A 1S6
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27
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Danilczuk M, Schlick S, Coms FD. Detection of Radicals by Spin Trapping ESR in a Fuel Cell Operating with a Sulfonated Poly(ether ether ketone) (SPEEK) Membrane. Macromolecules 2013. [DOI: 10.1021/ma401188u] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Marek Danilczuk
- Department of Chemistry and Biochemistry, University of Detroit Mercy, 4001 West McNichols, Detroit, Michigan
48221, United States
| | - Shulamith Schlick
- Department of Chemistry and Biochemistry, University of Detroit Mercy, 4001 West McNichols, Detroit, Michigan
48221, United States
| | - Frank D. Coms
- General Motors Electrochemical Energy Research Lab,
10 Carriage Street, Honeoye Falls, New York 14472, United States
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28
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Potential implication of the chemical properties and bioactivity of nitrone spin traps for therapeutics. Future Med Chem 2012; 4:1171-207. [PMID: 22709256 DOI: 10.4155/fmc.12.74] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Nitrone therapeutics has been employed in the treatment of oxidative stress-related diseases such as neurodegeneration, cardiovascular disease and cancer. The nitrone-based compound NXY-059, which is the first drug to reach clinical trials for the treatment of acute ischemic stroke, has provided promise for the development of more robust pharmacological agents. However, the specific mechanism of nitrone bioactivity remains unclear. In this review, we present a variety of nitrone chemistry and biological activity that could be implicated for the nitrone's pharmacological activity. The chemistries of spin trapping and spin adduct reveal insights on the possible roles of nitrones for altering cellular redox status through radical scavenging or nitric oxide donation, and their biological effects are presented. An interdisciplinary approach towards the development of novel synthetic antioxidants with improved pharmacological properties encompassing theoretical, synthetic, biochemical and in vitro/in vivo studies is covered.
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29
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Sui M, Xing S, Sheng L, Huang S, Guo H. Heterogeneous catalytic ozonation of ciprofloxacin in water with carbon nanotube supported manganese oxides as catalyst. JOURNAL OF HAZARDOUS MATERIALS 2012; 227-228:227-236. [PMID: 22658829 DOI: 10.1016/j.jhazmat.2012.05.039] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/27/2011] [Revised: 04/23/2012] [Accepted: 05/10/2012] [Indexed: 06/01/2023]
Abstract
Carbon nanotube-supported manganese oxides (MnOx/MWCNT) were used as catalysts to assist ozone in degrading ciprofloxacin in water. Manganese oxides were successfully loaded on multi-walled carbon nanotube surfaces by simply impregnating the carbon nanotube with permanganate solution. The catalytic activities of MnOx/MWCNT in ciprofloxacin ozonation, including degradation, mineralization effectiveness, and antibacterial activity change, were investigated. The presence of MnOx/MWCNT significantly elevated the degradation and mineralization efficiency of ozone on ciprofloxacin. The microbiological assay with a reference Escherichia coli strain indicated that ozonation with MnOx/MWCNT results in more effective antibacterial activity inhibition of ciprofloxacin than that in ozonation alone. The effects of catalyst dose, initial ciprofloxacin concentration, and initial pH conditions on ciprofloxacin ozonation with MnOx/MWCNT were surveyed. Electron spin resonance trapping was applied to assess the role of MnOx/MWCNT in generating hydroxyl radicals (HO) during ozonation. Stronger 5,5-dimethyl-1-pyrroline-N-oxide-OH signals were observed in the ozonation with MnOx/MWCNT compared with those in ozonation alone, indicating that MnOx/MWCNT promoted the generation of hydroxyl radicals. The degradation of ciprofloxacin was studied in drinking water and wastewater process samples to gauge the potential effects of water background matrix on MnOx/MWCNT catalytic ozonation.
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Affiliation(s)
- Minghao Sui
- State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai 200092, People's Republic of China.
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SUI M, DUAN B, SHENG L, HUANG S, SHE L. Catalytic Performance of Layered Double Hydroxides Co-Mn-Al for Ozonation of Organic Pollutants in Water. CHINESE JOURNAL OF CATALYSIS 2012. [DOI: 10.1016/s1872-2067(11)60392-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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31
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Hammond C, Forde MM, Ab Rahim MH, Thetford A, He Q, Jenkins RL, Dimitratos N, Lopez-Sanchez JA, Dummer NF, Murphy DM, Carley AF, Taylor SH, Willock DJ, Stangland EE, Kang J, Hagen H, Kiely CJ, Hutchings GJ. Direct Catalytic Conversion of Methane to Methanol in an Aqueous Medium by using Copper-Promoted Fe-ZSM-5. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201108706] [Citation(s) in RCA: 80] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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32
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Hammond C, Forde MM, Ab Rahim MH, Thetford A, He Q, Jenkins RL, Dimitratos N, Lopez-Sanchez JA, Dummer NF, Murphy DM, Carley AF, Taylor SH, Willock DJ, Stangland EE, Kang J, Hagen H, Kiely CJ, Hutchings GJ. Direct Catalytic Conversion of Methane to Methanol in an Aqueous Medium by using Copper-Promoted Fe-ZSM-5. Angew Chem Int Ed Engl 2012; 51:5129-33. [DOI: 10.1002/anie.201108706] [Citation(s) in RCA: 393] [Impact Index Per Article: 32.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2011] [Revised: 02/02/2012] [Indexed: 11/06/2022]
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33
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Kim SU, Villamena FA. Reactivities of superoxide and hydroperoxyl radicals with disubstituted cyclic nitrones: a DFT study. J Phys Chem A 2012; 116:886-98. [PMID: 22085265 PMCID: PMC3349087 DOI: 10.1021/jp209896n] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
The unique ability of nitrone spin traps to detect and characterize transient free radicals by electron paramagnetic resonance (EPR) spectroscopy has fueled the development of new spin traps with improved properties. Among a variety of free radicals in chemical and biological systems, superoxide radical anion (O(2)(•-)) plays a critical role as a precursor to other more oxidizing species such as hydroxyl radical (HO(•)), peroxynitrite (ONOO(-)), and hypochlorous acid (HOCl), and therefore the direct detection of O(2)(•-) is important. To overcome the limitations of conventional cyclic nitrones, that is, poor reactivity with O(2)(•-), instability of the O(2)(•-) adduct, and poor cellular target specificity, synthesis of disubstituted nitrones has become attractive. Disubstituted nitrones offer advantages over the monosubstituted ones because they allow bifunctionalization of spin traps, therefore accommodating all the desired spin trap properties in one molecular design. However, because of the high number of possible disubstituted analogues as candidate, a systematic computational study is needed to find leads for the optimal spin trap design for biconjugation. In this paper, calculation of the energetics of O(2)(•-) and HO(2)(•) adduct formation from various disubstituted nitrones at PCM/B3LYP/6-31+G(d,p)//B3LYP/6-31G(d) level of theory was performed to determine the most favorable disubstituted nitrones for this reaction. In addition, our results provided general trends of radical reactivity that is dependent upon but not exclusive to the charge densities of nitronyl-C, the position of substituents including stereoselectivities, and the presence of intramolecular H-bonding interaction. Unusually high exoergic ΔG(298K,aq)'s for O(2)(•-) and HO(2)(•) adduct formation were predicted for (3S,5S)-5-methyl-3,5-bis(methylcarbamoyl)-1-pyrroline N-oxide (11-cis) and (4S,5S)-5-dimethoxyphosphoryl-5-methyl-4-ethoxycarbonyl-1-pyrroline N-oxide (29-trans) with ΔG(298K,aq) = -3.3 and -9.4 kcal/mol, respectively, which are the most exoergic ΔG(298K,aq) observed thus far for any nitrone at the level of theory employed in this study.
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Affiliation(s)
- Shang-U Kim
- Department of Pharmacology and Davis Heart and Lung Research Institute, College of Medicine, The Ohio State University, Columbus, OH, 43210
| | - Frederick A. Villamena
- Department of Pharmacology and Davis Heart and Lung Research Institute, College of Medicine, The Ohio State University, Columbus, OH, 43210
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34
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Kholdeeva OA, Ivanchikova ID, Zalomaeva OV, Sorokin AB, Skobelev IY, Talsi EP. Mechanistic Insights into Oxidation of 2-Methyl-1-naphthol with Dioxygen: Autoxidation or a Spin-Forbidden Reaction? J Phys Chem B 2011; 115:11971-83. [DOI: 10.1021/jp2055975] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Oxana A. Kholdeeva
- Boreskov Institute of Catalysis, Lavrentiev Avenue 5, Novosibirsk, 630090, Russia
| | - Irina D. Ivanchikova
- Boreskov Institute of Catalysis, Lavrentiev Avenue 5, Novosibirsk, 630090, Russia
| | - Olga V. Zalomaeva
- Boreskov Institute of Catalysis, Lavrentiev Avenue 5, Novosibirsk, 630090, Russia
| | - Alexander B. Sorokin
- Institut de Recherches sur la Catalyse, CNRS, 2, Avenue A. Einstein, 69626 Villeurbanne Cedex, France
| | - Igor Y. Skobelev
- Boreskov Institute of Catalysis, Lavrentiev Avenue 5, Novosibirsk, 630090, Russia
| | - Eugenii P. Talsi
- Boreskov Institute of Catalysis, Lavrentiev Avenue 5, Novosibirsk, 630090, Russia
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35
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Kim SU, Liu Y, Nash KM, Zweier JL, Rockenbauer A, Villamena FA. Fast reactivity of a cyclic nitrone-calix[4]pyrrole conjugate with superoxide radical anion: theoretical and experimental studies. J Am Chem Soc 2010; 132:17157-73. [PMID: 21070040 PMCID: PMC3121924 DOI: 10.1021/ja105198c] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Nitrone spin traps have been employed as probes for the identification of transient radical species in chemical and biological systems using electron paramagnetic resonance (EPR) spectroscopy and have exhibited pharmacological activity against oxidative-stress-mediated diseases. Since superoxide radical anion (O2(•-)) is a major precursor to most reactive oxygen species and calix[4]pyrroles have been shown to exhibit high affinity to anions, a cyclic nitrone conjugate of calix[4]pyrrole (CalixMPO) was designed, synthesized, and characterized. Computational studies at the PCM/B3LYP/6-31+G(d,p)//B3LYP/6-31G(d) level suggest a pendant-type linkage between the calix[4]pyrrole and the nitrone to be the most efficient design for spin trapping of O2(•-), giving exoergic reaction enthalpies (ΔH(298K,aq)) and free energies (ΔG(298K,aq)) of -16.9 and -2.1 kcal/mol, respectively. (1)H NMR study revealed solvent-dependent conformational changes in CalixMPO leading to changes in the electronic properties of the nitronyl group upon H-bonding with the pyrrole groups as also confirmed by calculations. CalixMPO spin trapping of O2(•-) exhibited robust EPR spectra. Kinetic analysis of O2(•-) adduct formation and decay in polar aprotic solvents using UV-vis stopped-flow and EPR methods gave a larger trapping rate constant for CalixMPO and a longer half-life for its O2(•-) adduct compared to the commonly used nitrones. The unusually high reactivity of CalixMPO with O2(•-) was rationalized to be due to the synergy between the α-effect and electrostatic effect by the calix[4]pyrrole moiety on O2(•-) and the nitrone, respectively. This work demonstrates for the first time the application of an anion receptor for the detection of one of the most important radical intermediates in biological and chemical systems (i.e., O2(•-)).
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Affiliation(s)
- Shang-U Kim
- Department of Pharmacology, Davis Heart and Lung Research Institute, College of Medicine, The Ohio State University, Columbus, OH, 43210, USA
- Center for Biomedical EPR Spectroscopy and Imaging, Davis Heart and Lung Research Institute, College of Medicine, The Ohio State University, Columbus, OH, 43210, USA
| | - Yangping Liu
- Center for Biomedical EPR Spectroscopy and Imaging, Davis Heart and Lung Research Institute, College of Medicine, The Ohio State University, Columbus, OH, 43210, USA
| | - Kevin M. Nash
- Department of Pharmacology, Davis Heart and Lung Research Institute, College of Medicine, The Ohio State University, Columbus, OH, 43210, USA
| | - Jay L. Zweier
- Center for Biomedical EPR Spectroscopy and Imaging, Davis Heart and Lung Research Institute, College of Medicine, The Ohio State University, Columbus, OH, 43210, USA
| | - Antal Rockenbauer
- Chemical Research Center, Institute of Structural Chemistry, H-1025 Budapest, Pusztaszeri 59, Hungary
| | - Frederick A. Villamena
- Department of Pharmacology, Davis Heart and Lung Research Institute, College of Medicine, The Ohio State University, Columbus, OH, 43210, USA
- Center for Biomedical EPR Spectroscopy and Imaging, Davis Heart and Lung Research Institute, College of Medicine, The Ohio State University, Columbus, OH, 43210, USA
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Diaz-Uribe CE, Daza MC, Martínez F, Páez-Mozo EA, Guedes CL, Di Mauro E. Visible light superoxide radical anion generation by tetra(4-carboxyphenyl)porphyrin/TiO2: EPR characterization. J Photochem Photobiol A Chem 2010. [DOI: 10.1016/j.jphotochem.2010.08.013] [Citation(s) in RCA: 72] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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ESR study of spin adducts of the direct electrocatalytic decomposition of light aliphatic alcohols in a polymer electrolyte fuel cell. Russ Chem Bull 2010. [DOI: 10.1007/s11172-010-0276-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Lamblin G, Leprince J, Devaux J, Mestdagh M, Gallez B, Leloup G. Hydroxyl radical release from dental resins: electron paramagnetic resonance evidence. Acta Biomater 2010; 6:3193-8. [PMID: 20206719 DOI: 10.1016/j.actbio.2010.03.001] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2009] [Revised: 02/26/2010] [Accepted: 03/01/2010] [Indexed: 11/29/2022]
Abstract
It is well known that polymeric free radicals remain trapped inside dental resins for a long time after photopolymerization. Moreover, although these high molecular mass compounds have very limited mobility, there is evidence to suggest that they disappear progressively over time. The purpose of this study was to provide new experimental data to help understand this phenomenon. To determine whether low molecular mass free radicals are released by dental composites stored in hydrophilic media, we used electron paramagnetic resonance spectroscopy to perform spin-trapping experiments on experimental and commercial samples stored in ethanol. Under these conditions, ethoxy radicals were produced. Further experiments demonstrated that (1) hydroxyl radicals were released from the methacrylated resin and (2) they reacted with ethanol molecules to produce "secondary" ethoxy free radicals. In addition to the well-known monomer toxicity of methacrylated resins, we may have identified a new source of concern for these biomaterials.
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Affiliation(s)
- Guillaume Lamblin
- School of Dental Medicine and Stomatology, Université catholique de Louvain, Avenue Hippocrate 10/5721, Brussels B-1200, Belgium
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Spulber M, Schlick S. Using Cyclodextrins to Encapsulate Oxygen-Centered and Carbon-Centered Radical Adducts: The Case of DMPO, PBN, and MNP Spin Traps. J Phys Chem A 2010; 114:6217-25. [PMID: 20462228 DOI: 10.1021/jp100777u] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Mariana Spulber
- Department of Chemistry and Biochemistry, University of Detroit Mercy, 4001 West McNichols Road, Detroit, Michigan 48221
| | - Shulamith Schlick
- Department of Chemistry and Biochemistry, University of Detroit Mercy, 4001 West McNichols Road, Detroit, Michigan 48221
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40
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Villamena FA. Superoxide radical anion adduct of 5,5-dimethyl-1-pyrroline N-oxide. 6. Redox properties. J Phys Chem A 2010; 114:1153-60. [PMID: 19968309 DOI: 10.1021/jp909614u] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Cyclic nitrones have been employed for decades as spin trapping reagents for the detection and identification of transient radicals, and have been employed as pharmacological agent against ROS-mediated toxicity. The short half-life of the nitrone-superoxide adducts limits the application of nitrones in biological millieu, and therefore investigaton of the redox properties of the superoxide adducts is important. Moreover, computational investigation of the redox properties of the nitrones and their corresponding spin adducts may provide new insights into the nature of their pharmacological activity against ROS-induced toxicity. In general, electron-withdrawing group substitution at the C-5 position results in higher EAs and IPs making these substituted nitrones more susceptible to reduction but more difficult to oxidize compared to DMPO. One-electron reduction and oxidation of nitrones both resulted in elongated N-C(2) bonds indicating the tendency of radical anion and cation forms of nitrone to undergo ring-opening. The EAs and IPs of various O(2)(*-) adducts indicate that DEPMPO-O(2)H is the most difficult to reduce and oxidize compared to the O(2)(*-) adducts of DMPO, EMPO, and AMPO. In general, nitroxides gave higher EAs compared to nitrones making them more suceptible to reduction. One-electron oxidation of nitroxides leads to elongation of the N-C(2) bond but not for their reduction. The energetics of redox reaction of O(2)(*-) adducts was also explored. Results indicate that the reduction of O(2)(*-) adducts with O(2)(*-) is preferred followed by their oxidation by O(2) and then by O(2)(*-), but the maximum difference between these free energies of redox reactions in aqueous solution is only 0.21 kcal/mol. The preferred decomposition pathways for the one-electron oxidation and reduction of nitroxides was also explored, and formation of potentially biologically active products such as NO, H(2)O(2), and hydroxamic acid was predicted.
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Affiliation(s)
- Frederick A Villamena
- Department of Pharmacology and Center for Biomedical EPR Spectroscopy and Imaging, The Davis Heart and Lung Research Institute, The Ohio State University, Columbus, Ohio 43210, USA.
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41
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Danilczuk M, Perkowski AJ, Schlick S. Ranking the Stability of Perfluorinated Membranes Used in Fuel Cells to Attack by Hydroxyl Radicals and the Effect of Ce(III): A Competitive Kinetics Approach Based on Spin Trapping ESR. Macromolecules 2010. [DOI: 10.1021/ma1001386] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Marek Danilczuk
- Department of Chemistry and Biochemistry, University of Detroit Mercy, 4001 West McNichols Road, Detroit, Michigan 48221
| | - Andrew J. Perkowski
- Department of Chemistry and Biochemistry, University of Detroit Mercy, 4001 West McNichols Road, Detroit, Michigan 48221
| | - Shulamith Schlick
- Department of Chemistry and Biochemistry, University of Detroit Mercy, 4001 West McNichols Road, Detroit, Michigan 48221
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Danilczuk M, Schlick S, Coms FD. Cerium(III) as a Stabilizer of Perfluorinated Membranes Used in Fuel Cells: In Situ Detection of Early Events in the ESR Resonator. Macromolecules 2009. [DOI: 10.1021/ma9017108] [Citation(s) in RCA: 76] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Affiliation(s)
- Marek Danilczuk
- Department of Chemistry and Biochemistry, University of Detroit Mercy, 4001 West McNichols Road, Detroit, Michigan 48221
| | - Shulamith Schlick
- Department of Chemistry and Biochemistry, University of Detroit Mercy, 4001 West McNichols Road, Detroit, Michigan 48221
| | - Frank D. Coms
- General Motors Electrochemical Energy Research Lab, 10 Carriage Street, Honeoye Falls, New York 14472
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Fang X, Shen PK, Song S, Stergiopoulos V, Tsiakaras P. Degradation of perfluorinated sulfonic acid films: An in-situ infrared spectro-electrochemical study. Polym Degrad Stab 2009. [DOI: 10.1016/j.polymdegradstab.2009.06.015] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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44
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Pinteala M, Schlick S. Direct ESR detection and spin trapping of radicals generated by reaction of oxygen radicals with sulfonated poly(ether ether ketone) (SPEEK) membranes. Polym Degrad Stab 2009. [DOI: 10.1016/j.polymdegradstab.2009.06.009] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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45
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Han Y, Liu Y, Rockenbauer A, Zweier JL, Durana G, Villamena FA. Lipophilic beta-cyclodextrin cyclic-nitrone conjugate: synthesis and spin trapping studies. J Org Chem 2009; 74:5369-80. [PMID: 19530689 PMCID: PMC2736355 DOI: 10.1021/jo900856x] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Nitrone spin traps are commonly employed as probes for the identification of transient radicals in chemical and biological systems using electron paramagnetic resonance (EPR) spectroscopy. Nitrones have also found applications as therapeutic agent in the treatment of radical-mediated diseases. Therefore, a spin trap that incorporates high reactivity to superoxide radical anion (O2(*-)), more persistent superoxide adduct, enhanced bioavailability, and selective targeting in one molecular design is desirable. In this work, the synthesis of a nitrone spin trap, 4, that is tethered via amide bonds to a beta-cyclodextrin (beta-CD) and a dodecyl chain was achieved with the expectation that the beta-cyclodextrin would lead to increased reactivity to O2(*-) and persistent O2(*-) adduct while the lipophilic chain would impart membrane targeting property. The two constitutional racemic isomers, 4a and 4b, were separated using preparative HPLC, and structural analysis and self-aggregation properties were carried out using NMR, induced circular dichroism, dynamic light scattering, transmission electron microscopy, and computational approach. EPR spin trapping of O2(*-) by 4a and 4b was only successful in DMSO and not in an aqueous system, due most likely to the amphiphilic character of 4 that can favor conformations (or aggregation) hindering radical addition to nitrone. Kinetics of formation and decay of the 4a-O2H adduct in polar aprotic solvents show faster reactivity to O2(*-) and more persistent O2(*-) adduct compared to nitrones not conjugated to beta-CD. Computational analysis of 4a and 4b as well as 4a-OOH and 4b-OOH adducts were carried out, and results show that isomerism, both constitutional and stereochemical, affects the orientations of aminoxyl-NO and/or hydroperoxyl groups relative to the beta-CD annulus for optimal H-bond interaction and stability.
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Affiliation(s)
- Yongbin Han
- Department of Pharmacology, The Davis Heart and Lung Research Institute, College of Medicine, The Ohio State University, Columbus, OH 43210
| | - Yangping Liu
- Center for Biomedical EPR Spectroscopy and Imaging, The Davis Heart and Lung Research Institute, College of Medicine, The Ohio State University, Columbus, OH 43210
| | - Antal Rockenbauer
- Chemical Research Center, Institute of Structural Chemistry, H-1025 Budapest, Pusztaszeri 59, Hungary
| | - Jay L. Zweier
- Center for Biomedical EPR Spectroscopy and Imaging, The Davis Heart and Lung Research Institute, College of Medicine, The Ohio State University, Columbus, OH 43210
| | - Grégory Durana
- Laboratoire de Chimie BioOrganique et des Systèmes Moléculaires Vectoriels, Faculté des Sciences, Université d’Avignon et des Pays de Vaucluse, 33 Rue Louis Pasteur, 84000 Avignon, France
| | - Frederick A. Villamena
- Department of Pharmacology, The Davis Heart and Lung Research Institute, College of Medicine, The Ohio State University, Columbus, OH 43210
- Center for Biomedical EPR Spectroscopy and Imaging, The Davis Heart and Lung Research Institute, College of Medicine, The Ohio State University, Columbus, OH 43210
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46
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Danilczuk M, Coms FD, Schlick S. Visualizing chemical reactions and crossover processes in a fuel cell inserted in the ESR resonator: detection by spin trapping of oxygen radicals, nafion-derived fragments, and hydrogen and deuterium atoms. J Phys Chem B 2009; 113:8031-42. [PMID: 19453175 DOI: 10.1021/jp901597f] [Citation(s) in RCA: 125] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
We present experiments in an in situ fuel cell (FC) inserted in the resonator of the ESR spectrometer that offered the ability to observe separately processes at anode and cathode sides and to monitor the formation of HO and HOO radicals, H and D atoms, and radical fragments derived from the Nafion membrane. The presence of the radicals was determined by spin-trapping electron spin resonance (ESR) with 5,5-dimethylpyrroline N-oxide (DMPO) as a spin trap. The in situ FC was operated at 300 K with a membrane-electrode assembly (MEA) based on Nafion 117 and Pt as catalyst, at closed and open circuit voltage conditions, CCV and OCV, respectively. Experiments with H(2) or D(2) at the anode and O(2) at the cathode were performed. The DMPO/OH adduct was detected only at the cathode for CCV operation, suggesting generation of hydroxyl radicals from H(2)O(2) formed electrochemically via the two-electron reduction of oxygen. The DMPO/OOH adduct, detected in this study for the first time in a FC, appeared at the cathode and anode for OCV operation, and at the cathode after CCV FC operation of >or=2 h. These results were interpreted in terms of electrochemical generation of HOO at the cathode (HO + H(2)O(2) --> H(2)O + HOO) and its chemical generation at the anode from hydrogen atoms and crossover oxygen (H + O(2) --> HOO). DMPO/H and DMPO/D adducts were detected at the anode and cathode sides, for CCV and OCV operation; H and D are aggressive radicals capable of abstracting fluorine from the tertiary carbon in the polymer membrane chain and of leading to chain fragmentation. Carbon-centered radical (CCR) adducts were detected at the cathode after CCV FC operation; weak CCR signals were also detected at the anode. CCRs can originate only from the Nafion membranes, and their presence indicates membrane fragmentation. Taken together, this study has demonstrated that FC operation involves processes such as gas crossover, reactions at the catalyst surface, and possible attack of the membrane by reactive H or D that do not occur in ex situ experiments in the laboratory, thus implying different mechanistic pathways in the two types of experiments.
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Affiliation(s)
- Marek Danilczuk
- Department of Chemistry, University of Detroit Mercy, 4001 West McNichols Road, Detroit, Michigan 48221, USA
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47
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Villamena FA, Liu Y, Zweier JL. Superoxide radical anion adduct of 5,5-dimethyl-1-pyrroline N-oxide. 4. Conformational effects on the EPR hyperfine splitting constants. J Phys Chem A 2009; 112:12607-15. [PMID: 19012384 DOI: 10.1021/jp8070579] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Spin trapping has been commonly employed in the detection of superoxide radical anion in chemical and biological systems; hence, accurate interpretation of the hyperfine splitting constants (hfsc's) arising from the O(2)(*-) adducts (also referred to as hydroperoxyl (HO(2)(*)) radical adducts) of various nitrones is important. In this work, the nature of the relevant hfsc's was investigated by examining the effect of conformational changes in the hydroperoxyl moiety of the O(2)(*-) adducts of 5,5-dimethyl-1-pyrroline N-oxide (DMPO), 5-ethoxycarbonyl-5-methyl-1-pyrroline N-oxide (EMPO), 5-diethoxyphosphoryl-5-methyl-1-pyrroline N-oxide (DEPMPO), 5-carbamoyl-5-methyl-1-pyrroline N-oxide (AMPO), and 7-oxa-1-azaspiro[4.4]non-1-en-6-one N-oxide, (CPCOMPO) on the magnitude of a(N), a(beta-H), and a(gamma-H). Conformational change around the substituents and their effect on the hfsc's were also explored. Results indicate that a(beta-H) is most sensitive to conformational changes of the hydroperoxyl and substituent groups relative to hfsc's of other nuclei. The orbital overlap between the C-H sigma-orbital and the SOMO of the nitroxyl nitrogen plays a crucial factor in determining the magnitude of the a(beta-H). The hfsc values for the O(2)(*-) adducts were predicted with high accuracy by using a low-cost computational method at the PCM(water)/BHandHLYP/EPR-III//B3LYP/6-31G* level of theory without taking into account the explicit water interaction.
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48
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Han Y, Tuccio B, Lauricella R, Rockenbauer A, Zweier JL, Villamena FA. Synthesis and Spin-Trapping Properties of a New Spirolactonyl Nitrone. J Org Chem 2008; 73:2533-41. [DOI: 10.1021/jo702434u] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yongbin Han
- Department of Pharmacology and Center for Biomedical EPR Spectroscopy and Imaging, The Davis Heart and Lung Research Institute, and the Division of Cardiovascular Medicine, Department of Internal Medicine, College of Medicine, The Ohio State University, Columbus, Ohio 43210, Laboratory Chimie Provence-UMR 6264, University of Provence-CNRS, Faculty of Sciences, Saint Jerome 13397 Marseille Cedex 20, France, and Chemical Research Center, Institute of Structural Chemistry, H-1025 Budapest, Pusztaszeri 59,
| | - Beatrice Tuccio
- Department of Pharmacology and Center for Biomedical EPR Spectroscopy and Imaging, The Davis Heart and Lung Research Institute, and the Division of Cardiovascular Medicine, Department of Internal Medicine, College of Medicine, The Ohio State University, Columbus, Ohio 43210, Laboratory Chimie Provence-UMR 6264, University of Provence-CNRS, Faculty of Sciences, Saint Jerome 13397 Marseille Cedex 20, France, and Chemical Research Center, Institute of Structural Chemistry, H-1025 Budapest, Pusztaszeri 59,
| | - Robert Lauricella
- Department of Pharmacology and Center for Biomedical EPR Spectroscopy and Imaging, The Davis Heart and Lung Research Institute, and the Division of Cardiovascular Medicine, Department of Internal Medicine, College of Medicine, The Ohio State University, Columbus, Ohio 43210, Laboratory Chimie Provence-UMR 6264, University of Provence-CNRS, Faculty of Sciences, Saint Jerome 13397 Marseille Cedex 20, France, and Chemical Research Center, Institute of Structural Chemistry, H-1025 Budapest, Pusztaszeri 59,
| | - Antal Rockenbauer
- Department of Pharmacology and Center for Biomedical EPR Spectroscopy and Imaging, The Davis Heart and Lung Research Institute, and the Division of Cardiovascular Medicine, Department of Internal Medicine, College of Medicine, The Ohio State University, Columbus, Ohio 43210, Laboratory Chimie Provence-UMR 6264, University of Provence-CNRS, Faculty of Sciences, Saint Jerome 13397 Marseille Cedex 20, France, and Chemical Research Center, Institute of Structural Chemistry, H-1025 Budapest, Pusztaszeri 59,
| | - Jay L. Zweier
- Department of Pharmacology and Center for Biomedical EPR Spectroscopy and Imaging, The Davis Heart and Lung Research Institute, and the Division of Cardiovascular Medicine, Department of Internal Medicine, College of Medicine, The Ohio State University, Columbus, Ohio 43210, Laboratory Chimie Provence-UMR 6264, University of Provence-CNRS, Faculty of Sciences, Saint Jerome 13397 Marseille Cedex 20, France, and Chemical Research Center, Institute of Structural Chemistry, H-1025 Budapest, Pusztaszeri 59,
| | - Frederick A. Villamena
- Department of Pharmacology and Center for Biomedical EPR Spectroscopy and Imaging, The Davis Heart and Lung Research Institute, and the Division of Cardiovascular Medicine, Department of Internal Medicine, College of Medicine, The Ohio State University, Columbus, Ohio 43210, Laboratory Chimie Provence-UMR 6264, University of Provence-CNRS, Faculty of Sciences, Saint Jerome 13397 Marseille Cedex 20, France, and Chemical Research Center, Institute of Structural Chemistry, H-1025 Budapest, Pusztaszeri 59,
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49
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Zhou C, Guerra MA, Qiu ZM, Zawodzinski, TA, Schiraldi DA. Chemical Durability Studies of Perfluorinated Sulfonic Acid Polymers and Model Compounds under Mimic Fuel Cell Conditions. Macromolecules 2007. [DOI: 10.1021/ma071603z] [Citation(s) in RCA: 109] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Chun Zhou
- Department of Macromolecular Science & Engineering, Department of Chemical Engineering, and the Case Advanced Power Institute, Case Western Reserve University, Cleveland, Ohio 44106, and 3M Fuel Cell Components Program, 3M Corporation, St. Paul, Minnesota 55144
| | - Miguel A. Guerra
- Department of Macromolecular Science & Engineering, Department of Chemical Engineering, and the Case Advanced Power Institute, Case Western Reserve University, Cleveland, Ohio 44106, and 3M Fuel Cell Components Program, 3M Corporation, St. Paul, Minnesota 55144
| | - Zai-Ming Qiu
- Department of Macromolecular Science & Engineering, Department of Chemical Engineering, and the Case Advanced Power Institute, Case Western Reserve University, Cleveland, Ohio 44106, and 3M Fuel Cell Components Program, 3M Corporation, St. Paul, Minnesota 55144
| | - Thomas A. Zawodzinski,
- Department of Macromolecular Science & Engineering, Department of Chemical Engineering, and the Case Advanced Power Institute, Case Western Reserve University, Cleveland, Ohio 44106, and 3M Fuel Cell Components Program, 3M Corporation, St. Paul, Minnesota 55144
| | - David A. Schiraldi
- Department of Macromolecular Science & Engineering, Department of Chemical Engineering, and the Case Advanced Power Institute, Case Western Reserve University, Cleveland, Ohio 44106, and 3M Fuel Cell Components Program, 3M Corporation, St. Paul, Minnesota 55144
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50
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Kim JK, Metcalfe IS. Investigation of the generation of hydroxyl radicals and their oxidative role in the presence of heterogeneous copper catalysts. CHEMOSPHERE 2007; 69:689-96. [PMID: 17604820 DOI: 10.1016/j.chemosphere.2007.05.041] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/11/2006] [Revised: 05/14/2007] [Accepted: 05/16/2007] [Indexed: 05/16/2023]
Abstract
The presence and impact of hydroxyl radicals generated via the catalytic decomposition of H(2)O(2) over heterogeneous copper catalysts were investigated by using two detection methods, an electron spin resonance-spin trapping method and a chemical probe method. Detection of the (5,5-dimethyl-1-pyrroline-N-oxide)-OH adduct signal and formation of 4-chlorocatechol during the oxidation of a 4-chlorophenol substrate demonstrated that the three heterogeneous copper catalysts employed here (CuO, Cu/Al(2)O(3) and CuO.ZnO/Al(2)O(3)) were capable of generating hydroxyl radicals in combination with H(2)O(2). The oxidative mechanism of the hydroxyl radical in the presence of heterogeneous copper catalysts is discussed with regard to the further oxidation of the (5,5-dimethyl-1-pyrroline-N-oxide)-OH adduct and hydroxylated products of 4-chlorophenol oxidation. Interestingly, integration of the 5,5-dimethyl-1-pyrroline-N-oxide-OH adduct signal could not be used to reliably measure the total amount of hydroxyl radicals generated as a result of oxidative attack on the adduct. This may be as a result of locally higher hydroxyl radical concentrations in the presence of a heterogeneous catalyst leading to further unwanted oxidation of the (5,5-dimethyl-1-pyrroline-N-oxide)-OH.
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Affiliation(s)
- J K Kim
- School of Chemical Engineering and Analytical Science, The University of Manchester, Manchester, UK
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