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Mydy LS, Hungerford J, Chigumba DN, Konwerski JR, Jantzi SC, Wang D, Smith JL, Kersten RD. An intramolecular macrocyclase in plant ribosomal peptide biosynthesis. Nat Chem Biol 2024; 20:530-540. [PMID: 38355722 PMCID: PMC11049724 DOI: 10.1038/s41589-024-01552-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2023] [Accepted: 01/12/2024] [Indexed: 02/16/2024]
Abstract
The biosynthetic dogma of ribosomally synthesized and posttranslationally modified peptides (RiPP) involves enzymatic intermolecular modification of core peptide motifs in precursor peptides. The plant-specific BURP-domain protein family, named after their four founding members, includes autocatalytic peptide cyclases involved in the biosynthesis of side-chain-macrocyclic plant RiPPs. Here we show that AhyBURP, a representative of the founding Unknown Seed Protein-type BURP-domain subfamily, catalyzes intramolecular macrocyclizations of its core peptide during the sequential biosynthesis of monocyclic lyciumin I via glycine-tryptophan crosslinking and bicyclic legumenin via glutamine-tyrosine crosslinking. X-ray crystallography of AhyBURP reveals the BURP-domain fold with two type II copper centers derived from a conserved stapled-disulfide and His motif. We show the macrocyclization of lyciumin-C(sp3)-N-bond formation followed by legumenin-C(sp3)-O-bond formation requires dioxygen and radical involvement based on enzyme assays in anoxic conditions and isotopic labeling. Our study expands enzymatic intramolecular modifications beyond catalytic moiety and chromophore biogenesis to RiPP biosynthesis.
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Affiliation(s)
- Lisa S Mydy
- Department of Medicinal Chemistry, University of Michigan, Ann Arbor, MI, USA.
| | - Jordan Hungerford
- Department of Medicinal Chemistry, University of Michigan, Ann Arbor, MI, USA
| | - Desnor N Chigumba
- Department of Medicinal Chemistry, University of Michigan, Ann Arbor, MI, USA
| | | | - Sarah C Jantzi
- Plasma Chemistry Laboratory, Center for Applied Isotope Studies, University of Georgia, Athens, GA, USA
| | - Di Wang
- Department of Medicinal Chemistry, University of Michigan, Ann Arbor, MI, USA
| | - Janet L Smith
- Life Sciences Institute, University of Michigan, Ann Arbor, MI, USA
- Department of Biological Chemistry, University of Michigan, Ann Arbor, MI, USA
| | - Roland D Kersten
- Department of Medicinal Chemistry, University of Michigan, Ann Arbor, MI, USA.
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2
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Ahlawat M, Neelakshi, Ramapanicker R, Govind Rao V. Enhancing Photocatalytic Attributes of Perovskite Nanocrystals in Aqueous Media via Ligand Engineering. ACS APPLIED MATERIALS & INTERFACES 2024; 16:623-632. [PMID: 38112532 DOI: 10.1021/acsami.3c14321] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2023]
Abstract
The remarkable catalytic potential of perovskite nanocrystals (NCs) remains underutilized due to their limited stability in polar media, resulting from the vulnerability of their structure to disruption by polar solvents. In this study, we address this challenge by employing the bolaamphiphilic NKE-12 ligand, which features multiple denticities to effectively shield the surface of CsPbBr3 NCs from polar solvent interactions without compromising their light-harvesting properties. Our research, utilizing electrochemical impedance and photocurrent response measurements, highlights efficient charge separation and charge transfer enabled by NKE-12 ligands, which feature multiple ionic groups and peptide bonds, compared to conventional oleylamine/oleic acid ligands on CsPbBr3 NCs. Through the utilization of purely ligand-derived water-dispersed CsPbBr3/NKE-12 NCs, we successfully showcased their photocatalytic activity for acrylamide polymerization. A series of control experiments unveil a radical-based reaction pathway and suggest the synergistic involvement of photogenerated electrons and holes in producing the O2·- and OH· free radicals, respectively. Our findings emphasize the crucial role of ligand engineering in stabilizing perovskites in water and harnessing their exceptional photocatalytic attributes. This study opens new avenues for applying perovskite NCs in various catalytic processes in polar media.
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Affiliation(s)
- Monika Ahlawat
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, Uttar Pradesh 208016, India
| | - Neelakshi
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, Uttar Pradesh 208016, India
| | - Ramesh Ramapanicker
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, Uttar Pradesh 208016, India
| | - Vishal Govind Rao
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, Uttar Pradesh 208016, India
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3
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Guo H, Qiu Y, Liu S, Zhang X, Zhao J. Tailoring flavin-based photosensitizers for efficient photooxidative coupling of benzylic amines. Phys Chem Chem Phys 2023; 26:161-173. [PMID: 38086643 DOI: 10.1039/d3cp04579j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2023]
Abstract
Photooxidative coupling of benzylic amines using naturally abundant O2 as an oxidant under visible light irradiation is an alternative green approach to synthesis imines and is of both fundamental and practical significance. We investigated the photophysical properties of flavin (FL) that is a naturally available sensitizer and its derivatives, i.e. 9-bromoflavin (MB-FL), 7,8-dibromoflavin (DB-FL) and 10-phenylflavin (Ph-FL), as well as the performance of these FL-based sensitizers (FLPSs) in the photooxidative coupling of benzylic amines to imines combining experimental and theoretical efforts. We showed that chemical functionalization with Br and phenyl effectively improves the photophysical properties of these FLPSs, in terms of absorption in the visible light range, singlet oxygen quantum yields, triplet lifetime, etc. Apart from nearly quantitative selectivity for the production of imines, the performance of DB-FL is superior to those of other FLPSs, and it is among the best photocatalysts for imine synthesis. Specifically, 0.5 mol% DB-FL is capable of converting 91% of 0.2 mmol benzylamine and more than 80% of 0.2 mmol fluorobenzylic amine derivatives into their corresponding imines in 5 h batch runs. Mechanistic investigation finely explained the observed photophysical properties of FLPSs and highlighted the dominant role of electron transfer in FLPS sensitized coupling of benzylic amines to imines. This work not only helps to understand the pathways for photocatalysis with FLPSs but also paves the way for the design of novel and efficient PSs to promote organic synthesis.
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Affiliation(s)
- Huimin Guo
- School of Chemistry, Dalian University of Technology, No. 2, Linggong Road, Dalian, 116024, P. R. China.
| | - Yang Qiu
- School of Chemistry, Dalian University of Technology, No. 2, Linggong Road, Dalian, 116024, P. R. China.
| | - Siyu Liu
- School of Chemistry, Dalian University of Technology, No. 2, Linggong Road, Dalian, 116024, P. R. China.
| | - Xiangyu Zhang
- School of Chemistry, Dalian University of Technology, No. 2, Linggong Road, Dalian, 116024, P. R. China.
| | - Jianzhang Zhao
- School of Chemistry, Dalian University of Technology, No. 2, Linggong Road, Dalian, 116024, P. R. China.
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4
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Lim SH, Kim MJ, Wee KR, Cho DW. Reaction-Environment-Dependent Photoaddition Reactions of N-Phenyl Amino Acid Esters Possessing a Silyl Group with Fullerene C 60: Selective Formation of Aminomethyl-1,2-dihydrofullerenes vs Fulleropyrrolidines. J Org Chem 2023; 88:12294-12310. [PMID: 37602462 DOI: 10.1021/acs.joc.3c00922] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/22/2023]
Abstract
The current study investigates SET-promoted photoaddition reactions of the silyl-group-containing N-phenylglycinates and N-phenylalaninates, N-((trimethylsilyl)methyl)-N-phenyl-substituted glycinates and alaninates, respectively, with fullerene C60 to explore how the types of amino acid esters (AAEs) and molecular oxygen affect the photoaddition reaction efficiencies and chemoselectivity of in situ formed radical cations of AAEs. The results showed that under deoxygenated (N2-purged) conditions, photoreactions of N-phenylglycinates with C60 produced aminomethyl-1,2-dihydrofullerenes through the addition of α-amino radicals arising by sequential SET and desilylation processes from initially formed secondary anilines to C60. In oxygenated conditions, photoreactions of N-phenylglycinates with C60, albeit less efficient, took place to form fulleropyrrolidines through a pathway involving 1,3-dipolar cycloaddition of azomethine ylides to C60 assisted by in situ formed 1O2. The same types of photoproducts were observed with N-phenylalaninates, though the reactions were less efficient. The use of methylene blue (MB) as a photosensitizer in the photoreactions under oxygenated conditions was especially effective in enhancing the efficiency of fulleropyrrolidine formation. These results demonstrate that photoaddition reactions of silyl-tether-containing N-phenyl AAEs with C60 can be governed by the reaction conditions and the presence or absence of a photosensitizer employed.
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Affiliation(s)
- Suk Hyun Lim
- Department of Chemistry, Yeungnam University, Gyeongsan, Gyeongbuk 38541, Republic of Korea
| | - Min-Ji Kim
- Department of Chemistry, Daegu University, Gyeongsan, Gyeongbuk 38453, Republic of Korea
| | - Kyung-Ryang Wee
- Department of Chemistry, Daegu University, Gyeongsan, Gyeongbuk 38453, Republic of Korea
| | - Dae Won Cho
- Department of Chemistry, Yeungnam University, Gyeongsan, Gyeongbuk 38541, Republic of Korea
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5
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Abstract
Nitroxides, also known as nitroxyl radicals, are long-lived or stable radicals with the general structure R1R2N-O•. The spin distribution over the nitroxide N and O atoms contributes to the thermodynamic stability of these radicals. The presence of bulky N-substituents R1 and R2 prevents nitroxide radical dimerization, ensuring their kinetic stability. Despite their reactivity toward various transient C radicals, some nitroxides can be easily stored under air at room temperature. Furthermore, nitroxides can be oxidized to oxoammonium salts (R1R2N═O+) or reduced to anions (R1R2N-O-), enabling them to act as valuable oxidants or reductants depending on their oxidation state. Therefore, they exhibit interesting reactivity across all three oxidation states. Due to these fascinating properties, nitroxides find extensive applications in diverse fields such as biochemistry, medicinal chemistry, materials science, and organic synthesis. This review focuses on the versatile applications of nitroxides in organic synthesis. For their use in other important fields, we will refer to several review articles. The introductory part provides a brief overview of the history of nitroxide chemistry. Subsequently, the key methods for preparing nitroxides are discussed, followed by an examination of their structural diversity and physical properties. The main portion of this review is dedicated to oxidation reactions, wherein parent nitroxides or their corresponding oxoammonium salts serve as active species. It will be demonstrated that various functional groups (such as alcohols, amines, enolates, and alkanes among others) can be efficiently oxidized. These oxidations can be carried out using nitroxides as catalysts in combination with various stoichiometric terminal oxidants. By reducing nitroxides to their corresponding anions, they become effective reducing reagents with intriguing applications in organic synthesis. Nitroxides possess the ability to selectively react with transient radicals, making them useful for terminating radical cascade reactions by forming alkoxyamines. Depending on their structure, alkoxyamines exhibit weak C-O bonds, allowing for the thermal generation of C radicals through reversible C-O bond cleavage. Such thermally generated C radicals can participate in various radical transformations, as discussed toward the end of this review. Furthermore, the application of this strategy in natural product synthesis will be presented.
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Affiliation(s)
- Dirk Leifert
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität, Corrensstrasse 40, 48149 Münster, Germany
| | - Armido Studer
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität, Corrensstrasse 40, 48149 Münster, Germany
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6
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Meng Y, Gnanamani E, Zare RN. One-Step Formation of Pharmaceuticals Having a Phenylacetic Acid Core Using Water Microdroplets. J Am Chem Soc 2023; 145:7724-7728. [PMID: 37011129 DOI: 10.1021/jacs.3c00773] [Citation(s) in RCA: 13] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/05/2023]
Abstract
The properties of water microdroplets strikingly differ from bulk water. Using room-temperature water microdroplets, we find that toluene can react with CO2 to form phenylacetic acid in one step without any catalyst with negative high voltage applied at the sprayer source. The chemical components of these microdroplets are identified by mass spectrometry, and product structures are confirmed by tandem mass spectrometry. In this manner, we generate three drug molecules in a single step: 4-aminophenylacetic acid (epithelial peptide transporter PepT1 inhibitor), 3,4-dihydroxyphenylacetic acid (dopamine metabolite neurotransmitter), and phenylacetic acid (sodium salt form; treatment of urea cycle disorder). Mechanistic studies show that benzyl radicals formed from hydroxyl radicals at the water microdroplet interface drive these carboxylation reactions. This water microdroplet chemistry is general, allowing activation and subsequent carboxylation of aryl α-C-H groups.
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Affiliation(s)
- Yifan Meng
- Department of Chemistry, Stanford University, Stanford, California 94305, United States
| | - Elumalai Gnanamani
- Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247667, India
| | - Richard N Zare
- Department of Chemistry, Stanford University, Stanford, California 94305, United States
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7
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Qian B, Zhang L, Zhang G, Fu Y, Zhu X, Shen G. Thermodynamic Evaluation on Alkoxyamines of TEMPO Derivatives, Stable Alkoxyamines or Potential Radical Donors? ChemistrySelect 2022. [DOI: 10.1002/slct.202204144] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
Affiliation(s)
- Bao‐Chen Qian
- School of Medical Engineering Jining Medical University Jining Shandong 272000 P. R. China
| | - Lu Zhang
- School of Medical Engineering Jining Medical University Jining Shandong 272000 P. R. China
| | - Gao‐Shuai Zhang
- School of Medical Engineering Jining Medical University Jining Shandong 272000 P. R. China
| | - Yan‐Hua Fu
- College of Chemistry and Environmental Engineering Anyang Institute of Technology Anyang Henan 455000 P. R. China
| | - Xiao‐Qing Zhu
- The State Key Laboratory of Elemento-Organic Chemistry Department of Chemistry Nankai University Tianjin 300071 P. R. China
| | - Guang‐Bin Shen
- School of Medical Engineering Jining Medical University Jining Shandong 272000 P. R. China
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8
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Obleser K, Kalaus H, Seidl B, Kozich M, Stanetty C, Mihovilovic MD. An Organic Chemist's Guide to Mediated Laccase Oxidation. Chembiochem 2022; 23:e202200411. [PMID: 36148536 PMCID: PMC10092592 DOI: 10.1002/cbic.202200411] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2022] [Revised: 09/20/2022] [Indexed: 01/25/2023]
Abstract
Laccases are oxidases that only require O2 as a terminal oxidant. Thus, they provide an attractive green alternative to established alcohol oxidation protocols. However, laccases typically require catalytic amounts of mediator molecules to serve as electron shuttles between the enzyme and desired substrate. Consequently, laccase-mediator systems are defined by a multitude of parameters such as, e. g., the choice of laccase and mediator, the respective concentrations, pH, and the oxygen source. This complexity and a perceived lack of comparable data throughout literature represent an entry burden into this field. To provide a solid starting point, particularly for organic chemists, we herein provide a time-resolved, quantitative laccase and mediator screening based on the oxidation of anis alcohol as model reaction. We measured the redox potentials of mediators under the reaction conditions to relate them to their performance. Lastly, for particularly efficient laccase-mediator pairs, we screened important reaction parameters, resulting in an optimized setup for mediator-assisted laccase catalyzed oxidations.
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Affiliation(s)
- Katharina Obleser
- Institute of Applied Synthetic Chemistry, TU Wien, Getreidemarkt 9, 1060, Vienna, Austria
| | - Hubert Kalaus
- Institute of Applied Synthetic Chemistry, TU Wien, Getreidemarkt 9, 1060, Vienna, Austria
| | - Bernhard Seidl
- Agrana Research & Innovation Center GmbH, Josef-Reither-Straße 21-23, 3430, Tulln, Austria
| | - Martin Kozich
- Agrana Research & Innovation Center GmbH, Josef-Reither-Straße 21-23, 3430, Tulln, Austria
| | - Christian Stanetty
- Institute of Applied Synthetic Chemistry, TU Wien, Getreidemarkt 9, 1060, Vienna, Austria
| | - Marko D Mihovilovic
- Institute of Applied Synthetic Chemistry, TU Wien, Getreidemarkt 9, 1060, Vienna, Austria
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9
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Singh P, Nath M. Tandem C–S Coupling and Debrominative Cyclization Enables an Easy Access to β-Thiazole-Fused Porphyrins. Org Lett 2022; 24:8586-8591. [DOI: 10.1021/acs.orglett.2c02945] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Affiliation(s)
- Pargat Singh
- Department of Chemistry, Faculty of Science, University of Delhi, Delhi 110 007, India
| | - Mahendra Nath
- Department of Chemistry, Faculty of Science, University of Delhi, Delhi 110 007, India
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10
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Meng Y, Gnanamani E, Zare RN. Direct C(sp 3)–N Bond Formation between Toluene and Amine in Water Microdroplets. J Am Chem Soc 2022; 144:19709-19713. [DOI: 10.1021/jacs.2c10032] [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)
- Yifan Meng
- Department of Chemistry, Stanford University, Stanford, California 94305, United States
| | - Elumalai Gnanamani
- Department of Chemistry, Stanford University, Stanford, California 94305, United States
- Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247667, India
| | - Richard N. Zare
- Department of Chemistry, Stanford University, Stanford, California 94305, United States
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11
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Williams PJH, Boustead GA, Heard DE, Seakins PW, Rickard AR, Chechik V. New Approach to the Detection of Short-Lived Radical Intermediates. J Am Chem Soc 2022; 144:15969-15976. [PMID: 36001076 PMCID: PMC9460783 DOI: 10.1021/jacs.2c03618] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
![]()
We report a new general method for trapping short-lived
radicals,
based on a homolytic substitution reaction SH2′.
This departure from conventional radical trapping by addition or radical–radical
cross-coupling results in high sensitivity, detailed structural information,
and general applicability of the new approach. The radical traps in
this method are terminal alkenes possessing a nitroxide leaving group
(e.g., allyl-TEMPO derivatives). The trapping process
thus yields stable products which can be stored and subsequently analyzed
by mass spectrometry (MS) supported by well-established techniques
such as isotope exchange, tandem MS, and high-performance liquid chromatography-MS.
The new method was applied to a range of model radical reactions in
both liquid and gas phases including a photoredox-catalyzed thiol–ene
reaction and alkene ozonolysis. An unprecedented range of radical
intermediates was observed in complex reaction mixtures, offering
new mechanistic insights. Gas-phase radicals can be detected at concentrations
relevant to atmospheric chemistry.
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Affiliation(s)
- Peter J H Williams
- Department of Chemistry, University of York, Heslington, York YO10 5DD, U.K
| | | | - Dwayne E Heard
- School of Chemistry, University of Leeds, Leeds LS2 9JT, U.K
| | - Paul W Seakins
- School of Chemistry, University of Leeds, Leeds LS2 9JT, U.K
| | - Andrew R Rickard
- Department of Chemistry, University of York, Heslington, York YO10 5DD, U.K.,National Centre for Atmospheric Science, University of York, Heslington, York YO10 5DD, U.K
| | - Victor Chechik
- Department of Chemistry, University of York, Heslington, York YO10 5DD, U.K
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12
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Efremov AA, Poryvaev AS, Polyukhov DM, Gromilov SA, Fedin MV. Oxidation of benzyl alcohol in the copper-doped ZIF-8 metal-organic framework with encapsulated nitroxyl radical. Russ Chem Bull 2022. [DOI: 10.1007/s11172-022-3548-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
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13
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Singh T, Panday P, Upreti GC, Ranjan S, Gupta RK, Singh A. Visible-light-mediated synthesis of α,β-diamino esters via coupling of N, N-dimethylanilines and glyoxalic oxime ethers. Org Biomol Chem 2022; 20:4522-4525. [PMID: 35605977 DOI: 10.1039/d2ob00361a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A visible-light-mediated synthesis of α,β-diamino esters has been developed via the cross coupling of N,N-dimethylanilines with glyoxalic oxime ethers. This protocol involves the generation of α-aminoalkyl radicals under mild reaction conditions, provides α,β-diamino esters in good to excellent yields, and can be performed on a gram-scale.
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Affiliation(s)
- Tavinder Singh
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, U. P., 208016, India.
| | - Prabhakar Panday
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, U. P., 208016, India.
| | - Ganesh Chandra Upreti
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, U. P., 208016, India.
| | - Sudhir Ranjan
- Department of Chemical Engineering, Indian Institute of Technology Kanpur, Kanpur, U. P., 208016, India
| | - Raju Kumar Gupta
- Department of Chemical Engineering, Indian Institute of Technology Kanpur, Kanpur, U. P., 208016, India
| | - Anand Singh
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, U. P., 208016, India.
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14
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Lin J, Zhao H, Cao H, Zhao Y, Chen C. Photoinduced release of odorous volatile organic compounds from aqueous pollutants: The role of reactive oxygen species in increasing risk during cross-media transformation. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 822:153397. [PMID: 35122842 DOI: 10.1016/j.scitotenv.2022.153397] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/09/2021] [Revised: 01/20/2022] [Accepted: 01/20/2022] [Indexed: 06/14/2023]
Abstract
Photoinduced volatile organic compounds (VOCs) release from fatty alcohols at the air-water interface, has attracted considerable attention. This paper comprehensively explores the release of odorous VOCs from aqueous micropollutants under photoirradiation, especially in terms of the important role of the reactive oxygen species (ROS) in increased risk by cross-media transformation. The formation and distribution of photoinduced VOCs produced by aqueous benzyl alcohol (BzOH), a common ingredient in personal care products, were monitored in situ by online gas chromatography equipped with mass spectrometry and flame ionization detector (GC-MS/FID). The photoreaction of BzOH followed first-order kinetics with a rate constant of 0.0158/min under air. After 180 min of ultraviolet irradiation, the accumulated output of the gas-phase products benzene and benzaldehyde (BA) reached 3.8 μmol and 2.6 μmol respectively, being approximately 10 times that under nitrogen. According to electron paramagnetic resonance measurements, singlet oxygen mainly promoted the oxidation of BzOH to BA, which was an important intermediate producing benzene via photocleavage. Odorous alicyclic hydrocarbons were also generated through photorearrangement under nitrogen. On the other hand, the Henry's law constants of the main products were much lower than those of BzOH, indicating that the photoproducts would volatilize from the aqueous phase into the gas phase. The odor threshold of gas-phase products decreased to varying degrees after photoirradiation. Especially for BA, one of the main products, its odor threshold decreased 130 times compared with BzOH. This study shows that the risk of cross-media pollution could significantly increase due to the transformation of aqueous pollutants into odorous VOCs under photoirradiation and provides new insight into its risk prevention.
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Affiliation(s)
- Jingyi Lin
- Beijing Engineering Research Center of Process Pollution Control, CAS Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Innovation Academy for Green Manufacture, Chinese Academy of Sciences, Beijing 100190, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - He Zhao
- Beijing Engineering Research Center of Process Pollution Control, CAS Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Innovation Academy for Green Manufacture, Chinese Academy of Sciences, Beijing 100190, China.
| | - Hongbin Cao
- Beijing Engineering Research Center of Process Pollution Control, CAS Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Innovation Academy for Green Manufacture, Chinese Academy of Sciences, Beijing 100190, China
| | - Yuehong Zhao
- Beijing Engineering Research Center of Process Pollution Control, CAS Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Innovation Academy for Green Manufacture, Chinese Academy of Sciences, Beijing 100190, China; National Basic Public Science Data Center, Beijing 100190, China
| | - Chuncheng Chen
- University of Chinese Academy of Sciences, Beijing 100049, China; Beijing National Laboratory for Molecular Sciences, Key Laboratory of Photochemistry, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
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15
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Qin C, Tang J, Qiao R, Lin S. Tetracycline sensitizes TiO2 for visible light photocatalytic degradation via ligand-to-metal charge transfer. CHINESE CHEM LETT 2022. [DOI: 10.1016/j.cclet.2022.01.067] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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16
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Valle-Amores MA, Blanco M, Agnoli S, Fraile A, Alemán J. Oxidized Multiwalled Nanotubes as Efficient Carbocatalyst for the General Synthesis of Azines. J Catal 2022. [DOI: 10.1016/j.jcat.2022.01.009] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
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17
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Gurung B, Pradhan S, Sharma D, Bhujel D, Basel S, Chettri S, Rasaily S, Pariyar A, Tamang S. CsPbBr 3 perovskite quantum dots as a visible light photocatalyst for cyclisation of diamines and amino alcohols: an efficient approach to synthesize imidazolidines, fused-imidazolidines and oxazolidines. Catal Sci Technol 2022. [DOI: 10.1039/d2cy00799a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report the synthesis of highly stable CsPbBr3QD based photocatalysts using dibromoisocyanuric acid (DBI) as a benign non-toxic bromide precursor.
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Affiliation(s)
- Bikram Gurung
- Department of Chemistry, School of Physical Sciences, Sikkim University, Sikkim 737102, India
| | - Sajan Pradhan
- Department of Chemistry, School of Physical Sciences, Sikkim University, Sikkim 737102, India
| | - Debesh Sharma
- Department of Chemistry, School of Physical Sciences, Sikkim University, Sikkim 737102, India
| | - Deshaj Bhujel
- Department of Chemistry, School of Physical Sciences, Sikkim University, Sikkim 737102, India
| | - Siddhant Basel
- Department of Chemistry, School of Physical Sciences, Sikkim University, Sikkim 737102, India
| | - Shivanand Chettri
- Department of Chemistry, School of Physical Sciences, Sikkim University, Sikkim 737102, India
| | - Sagarmani Rasaily
- Department of Chemistry, School of Physical Sciences, Sikkim University, Sikkim 737102, India
| | - Anand Pariyar
- Department of Chemistry, School of Physical Sciences, Sikkim University, Sikkim 737102, India
| | - Sudarsan Tamang
- Department of Chemistry, School of Physical Sciences, Sikkim University, Sikkim 737102, India
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18
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Guo H, Lei Z, Ma X, Liu S, Qiu Y, Zhao J. Boosting Sulfides Photooxidation by Fusing Naphthalimide and Flavin together. Phys Chem Chem Phys 2022; 24:15255-15264. [DOI: 10.1039/d2cp01368a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Efficient and selective photocatalytic conversion of chemicals with visible light and naturally abundant resources has long been desired, but this requires finely designed sensitizers that are capable to convert light...
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19
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Huh J, Moon YW, Park J, Atala A, Yoo JJ, Lee SJ. Combinations of photoinitiator and UV absorber for cell-based digital light processing (DLP) bioprinting. Biofabrication 2021; 13:034103. [PMID: 33930877 DOI: 10.1088/1758-5090/abfd7a] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2020] [Accepted: 04/30/2021] [Indexed: 11/12/2022]
Abstract
Digital light processing (DLP) bioprinting, which provides predominant speed, resolution, and adaptability for fabricating complex cell-laden three-dimensional (3D) structures, requires a combination of photoinitiator (PI) and UV absorber (UA) that plays critical roles during the photo-polymerization of bioinks. However, the PI and UA combination has not been highlighted for cell-based DLP bioprinting. In this study, the most used PIs and UAs in cell-based bioprinting were compared to optimize a combination that can ensure the maximum DLP printability, while maintaining the cellular activities during the process. The crosslinking time and printability of PIs were assessed, which are critical in minimizing the cell damage by the UV exposure during the fabrication process. On the other hand, the UAs were evaluated based on their ability to prevent the over-curing of layers beyond the focal layer and the scattering of light, which are required for the desirable crosslinking of a hydrogel and high resolution (25-50µms) to create a complex 3D cell-laden construct. Lastly, the cytotoxicity of PIs and UAs was assessed by measuring the cellular activity of 2D cultured and 3D bioprinted cells. The optimized PI and UA combination provided high initial cell viability (>90%) for up to 14 days in culture and could fabricate complex 3D structures like a perfusable heart-shaped construct with open vesicles and atriums. This combination can provide a potential starting condition when preparing the bioink for the cell-based DLP bioprinting in tissue engineering applications.
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Affiliation(s)
- JunTae Huh
- Wake Forest Institute for Regenerative Medicine, Wake Forest School of Medicine, Winston-Salem, NC, United States of America
- School of Biomedical Engineering and Sciences, Wake Forest University-Virginia Tech, Winston-Salem, NC, United States of America
| | - Young-Wook Moon
- Wake Forest Institute for Regenerative Medicine, Wake Forest School of Medicine, Winston-Salem, NC, United States of America
| | - Jihoon Park
- Wake Forest Institute for Regenerative Medicine, Wake Forest School of Medicine, Winston-Salem, NC, United States of America
| | - Anthony Atala
- Wake Forest Institute for Regenerative Medicine, Wake Forest School of Medicine, Winston-Salem, NC, United States of America
- School of Biomedical Engineering and Sciences, Wake Forest University-Virginia Tech, Winston-Salem, NC, United States of America
| | - James J Yoo
- Wake Forest Institute for Regenerative Medicine, Wake Forest School of Medicine, Winston-Salem, NC, United States of America
- School of Biomedical Engineering and Sciences, Wake Forest University-Virginia Tech, Winston-Salem, NC, United States of America
| | - Sang Jin Lee
- Wake Forest Institute for Regenerative Medicine, Wake Forest School of Medicine, Winston-Salem, NC, United States of America
- School of Biomedical Engineering and Sciences, Wake Forest University-Virginia Tech, Winston-Salem, NC, United States of America
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20
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Matsuoka Y, Yamada KI. Detection and structural analysis of lipid-derived radicals in vitro and in vivo. Free Radic Res 2021; 55:441-449. [PMID: 33504242 DOI: 10.1080/10715762.2021.1881500] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Lipids can be oxidized by reactive oxygen species, resulting in lipid peroxidation and the formation of reactive metabolites such as lipid-derived electrophiles. These products have been reported to induce inflammation, angiogenesis, and ferroptosis. Lipid peroxidation can produce many different products, each of which performs a different function, and which can be challenging to detect in vivo. The initial products of lipid oxidation are lipid-derived radicals, which can cause extensive chain reactions leading to lipid peroxidation. Hence, the ability to detect lipid radicals may provide information about this important class of molecules and the mechanism by which they cause cellular and tissue damage in a wide range of oxidative conditions. In this review, we report recent scientific advances in the detection of lipid-derived radicals in vitro and in cultured cells. We also introduce the possibility of visualization and structural analysis of lipid-derived radicals generated not only in in cells but also in animal tissue samples from oxidative disease models, using fluorescence-based lipid radicals' detection probes. We anticipate that the various innovative techniques summarized in this paper will be applied and further developed to clarify the role of lipid peroxidation in the pathogenesis of oxidative stress-associated diseases.
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Affiliation(s)
- Yuta Matsuoka
- Physical Chemistry for Life Science Laboratory, Faculty of Pharmaceutical Sciences, Kyushu University, Fukuoka, Japan
| | - Ken-Ichi Yamada
- Physical Chemistry for Life Science Laboratory, Faculty of Pharmaceutical Sciences, Kyushu University, Fukuoka, Japan
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21
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Cook CC, Fong EJ, Schwartz JJ, Porcincula DH, Kaczmarek AC, Oakdale JS, Moran BD, Champley KM, Rackson CM, Muralidharan A, McLeod RR, Shusteff M. Highly Tunable Thiol-Ene Photoresins for Volumetric Additive Manufacturing. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2020; 32:e2003376. [PMID: 33002275 DOI: 10.1002/adma.202003376] [Citation(s) in RCA: 41] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2020] [Revised: 07/20/2020] [Indexed: 05/17/2023]
Abstract
Volumetric additive manufacturing (VAM) forms complete 3D objects in a single photocuring operation without layering defects, enabling 3D printed polymer parts with mechanical properties similar to their bulk material counterparts. This study presents the first report of VAM-printed thiol-ene resins. With well-ordered molecular networks, thiol-ene chemistry accesses polymer materials with a wide range of mechanical properties, moving VAM beyond the limitations of commonly used acrylate formulations. Since free-radical thiol-ene polymerization is not inhibited by oxygen, the nonlinear threshold response required in VAM is introduced by incorporating 2,2,6,6-tetramethyl-1-piperidinyloxy (TEMPO) as a radical scavenger. Tuning of the reaction kinetics is accomplished by balancing inhibitor and initiator content. Coupling this with quantitative measurements of the absorbed volumetric optical dose allows control of polymer conversion and gelation during printing. Importantly, this work thereby establishes the first comprehensive framework for spatial-temporal control over volumetric energy distribution, demonstrating structures 3D printed in thiol-ene resin by means of tomographic volumetric VAM. Mechanical characterization of this thiol-ene system, with varied ratios of isocyanurate and triethylene glycol monomers, reveals highly tunable mechanical response far more versatile than identical acrylate-based resins. This broadens the range of materials and properties available for VAM, taking another step toward high-performance printed polymers.
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Affiliation(s)
- Caitlyn C Cook
- Lawrence Livermore National Laboratory, Livermore, CA, 94550, USA
| | - Erika J Fong
- Lawrence Livermore National Laboratory, Livermore, CA, 94550, USA
| | | | | | | | - James S Oakdale
- Lawrence Livermore National Laboratory, Livermore, CA, 94550, USA
| | - Bryan D Moran
- Lawrence Livermore National Laboratory, Livermore, CA, 94550, USA
| | - Kyle M Champley
- Lawrence Livermore National Laboratory, Livermore, CA, 94550, USA
| | - Charles M Rackson
- Electrical, Computer, and Energy Engineering Department, University of Colorado, Boulder, CO, 80309, USA
| | - Archish Muralidharan
- Materials Science and Engineering Program, University of Colorado, Boulder, CO, 80303, USA
| | - Robert R McLeod
- Electrical, Computer, and Energy Engineering Department, University of Colorado, Boulder, CO, 80309, USA
| | - Maxim Shusteff
- Lawrence Livermore National Laboratory, Livermore, CA, 94550, USA
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22
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Manzoor K, Mishra SK, Podmore ID. Detection and identification of ethanal-derived spin-trapped free radicals using headspace thermal desorption gas chromatography-mass spectrometry (TD-GC-MS). Free Radic Res 2020; 54:745-755. [PMID: 33092425 DOI: 10.1080/10715762.2020.1841183] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
In this study, we demonstrate a novel approach to the detection and identification of the products of spin-trapped free radicals. Hydroxyl free radicals were generated by Fenton-based chemistry in the presence of ethanal and the spin-trapping agent N-tert-butyl-α-phenylnitrone (PBN). The resulting volatile compounds present in the reaction vial headspace were collected using thermal desorption (TD) and analysed by gas chromatography-mass spectrometry (GC-MS). Eleven compounds were detected in the headspace, and their identification was aided by using either a fluorinated or deuterated analogue of PBN as an alternative spin trap and/or deuterated ethanal (CD3CHO) as the secondary source of free radicals. The electron-ionisation (EI) mass spectra clearly demonstrate the "capture" of methyl radicals; two of the compounds detected were identified as containing one methyl group derived from ethanal, and four were shown to contain two methyl groups. This study demonstrates that sampling the reaction headspace using TD-GC-MS is a viable method for analysing products of free radical trapping, and potentially may be applied to a wide range of free radical systems.
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Affiliation(s)
- Kamran Manzoor
- Biomedical Research Institute, University of Salford, Salford, UK
| | - Sanat K Mishra
- Biomedical Research Institute, University of Salford, Salford, UK
| | - Ian D Podmore
- Biomedical Research Institute, University of Salford, Salford, UK
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23
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Hunold J, Eisermann J, Brehm M, Hinderberger D. Characterization of Aqueous Lower-Polarity Solvation Shells Around Amphiphilic 2,2,6,6-Tetramethylpiperidine-1-oxyl Radicals in Water. J Phys Chem B 2020; 124:8601-8609. [DOI: 10.1021/acs.jpcb.0c04863] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
- Johannes Hunold
- Institut für Chemie, Martin-Luther-Universität Halle-Wittenberg, Von-Danckelmann-Platz 4, 06120 Halle (Saale), Germany
| | - Jana Eisermann
- Institut für Chemie, Martin-Luther-Universität Halle-Wittenberg, Von-Danckelmann-Platz 4, 06120 Halle (Saale), Germany
| | - Martin Brehm
- Institut für Chemie, Martin-Luther-Universität Halle-Wittenberg, Von-Danckelmann-Platz 4, 06120 Halle (Saale), Germany
| | - Dariush Hinderberger
- Institut für Chemie, Martin-Luther-Universität Halle-Wittenberg, Von-Danckelmann-Platz 4, 06120 Halle (Saale), Germany
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24
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Cui J, Guo Z, Yi J, Liu X, Wu K, Liang P, Li Q, Liu Y, Wang Y, Xia Y, Zhang J. Organic Cathode Materials for Rechargeable Zinc Batteries: Mechanisms, Challenges, and Perspectives. CHEMSUSCHEM 2020; 13:2160-2185. [PMID: 32043825 DOI: 10.1002/cssc.201903265] [Citation(s) in RCA: 52] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2019] [Indexed: 05/27/2023]
Abstract
Energy and environmental issues have given rise to the development of advanced energy-storage devices worldwide. Electrochemical energy technologies, such as rechargeable batteries, are considered to be the most reliable and efficient candidates. Compared with other batteries, zinc-based batteries seem promising due to their advantages, including inherent safety, cost-effectiveness, and environmentally friendliness. As potential alternatives to conventional inorganic cathodes, organic cathodes for Zn-organic batteries have become a hot topic for research, owing to their favorable characteristics, such as easy structure design, controllable synthesis, and environmental benignancy. Herein, a systematic overview on the fundamentals of organic cathode materials for zinc batteries, including material design, electrochemical mechanisms, technical advances, and challenging analysis, is provided. Furthermore, perspectives and corresponding research directions are offered to facilitate the future development of organic cathode materials for zinc batteries toward practical applications.
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Affiliation(s)
- Jin Cui
- Institute for Sustainable Energy/College of Sciences, Shanghai University, 99 Shangda Road, Shanghai, 200444, PR China
| | - Zhaowei Guo
- Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Institute of New Energy, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Fudan University, 200433, Shanghai, PR China
| | - Jin Yi
- Institute for Sustainable Energy/College of Sciences, Shanghai University, 99 Shangda Road, Shanghai, 200444, PR China
| | - Xiaoyu Liu
- Institute for Sustainable Energy/College of Sciences, Shanghai University, 99 Shangda Road, Shanghai, 200444, PR China
| | - Kai Wu
- Institute for Sustainable Energy/College of Sciences, Shanghai University, 99 Shangda Road, Shanghai, 200444, PR China
| | - Pengcheng Liang
- Institute for Sustainable Energy/College of Sciences, Shanghai University, 99 Shangda Road, Shanghai, 200444, PR China
| | - Qian Li
- State Key Laboratory of Advanced Special Steel & School of Materials Science and Engineering & Shanghai Key Laboratory of Advanced Ferrometallurgy & Materials Genome Institute, Shanghai University, 99 Shangda Road, Shanghai, 200444, PR China
| | - Yuyu Liu
- Institute for Sustainable Energy/College of Sciences, Shanghai University, 99 Shangda Road, Shanghai, 200444, PR China
| | - Yonggang Wang
- Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Institute of New Energy, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Fudan University, 200433, Shanghai, PR China
| | - Yongyao Xia
- Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Institute of New Energy, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Fudan University, 200433, Shanghai, PR China
- College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou, 450001, PR China
| | - Jiujun Zhang
- Institute for Sustainable Energy/College of Sciences, Shanghai University, 99 Shangda Road, Shanghai, 200444, PR China
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25
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Lakavath B, Hedison TM, Heyes DJ, Shanmugam M, Sakuma M, Hoeven R, Tilakaratna V, Scrutton NS. Radical-based photoinactivation of fatty acid photodecarboxylases. Anal Biochem 2020; 600:113749. [PMID: 32348726 DOI: 10.1016/j.ab.2020.113749] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2020] [Revised: 04/16/2020] [Accepted: 04/17/2020] [Indexed: 11/25/2022]
Abstract
Fatty acid photodecarboxylases (FAP) are a recently discovered family of FAD-containing, light-activated enzymes, which convert fatty acids to n-alkanes/alkenes with potential applications in the manufacture of fine and speciality chemicals and fuels. Poor catalytic stability of FAPs is however a major limitation. Here, we describe a methodology to purify catalytically stable and homogeneous samples of recombinant Chlorella variabilis NC64A FAP (CvFAP) from Escherichia coli. We demonstrate however that blue light-exposure, which is required for photodecarboxylase activity, also leads to irreversible inactivation of the enzyme, especially in the absence of palmitate substrate. Photoinactivation is attributed to formation of protein based organic radicals, which were observed by EPR spectroscopy. To suppress photoinactivation, we prepared stable and catalytically active FAP in the dark. The steady-state kinetic parameters of CvFAP (kcat: 0.31 ± 0.06 s-1 and KM: 98.8 ± 53.3 μM) for conversion of palmitic acid to pentadecane were determined using gas chromatography. Methods described here should now enable studies of the catalytic mechanism and exploitation of FAPs in biotechnology.
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Affiliation(s)
- Balaji Lakavath
- The Manchester Institute of Biotechnology and Department of Chemistry, The University of Manchester, Manchester, M1 7DN, United Kingdom
| | - Tobias M Hedison
- The Manchester Institute of Biotechnology and Department of Chemistry, The University of Manchester, Manchester, M1 7DN, United Kingdom; EPSRC/BBSRC Future Biomanufacturing Research Hub, Manchester Institute of Biotechnology, The University of Manchester, Manchester, M1 7DN, United Kingdom
| | - Derren J Heyes
- The Manchester Institute of Biotechnology and Department of Chemistry, The University of Manchester, Manchester, M1 7DN, United Kingdom
| | - Muralidharan Shanmugam
- The Manchester Institute of Biotechnology and Department of Chemistry, The University of Manchester, Manchester, M1 7DN, United Kingdom
| | - Michiyo Sakuma
- The Manchester Institute of Biotechnology and Department of Chemistry, The University of Manchester, Manchester, M1 7DN, United Kingdom
| | - Robin Hoeven
- The Manchester Institute of Biotechnology and Department of Chemistry, The University of Manchester, Manchester, M1 7DN, United Kingdom
| | - Viranga Tilakaratna
- EPSRC/BBSRC Future Biomanufacturing Research Hub, Manchester Institute of Biotechnology, The University of Manchester, Manchester, M1 7DN, United Kingdom
| | - Nigel S Scrutton
- The Manchester Institute of Biotechnology and Department of Chemistry, The University of Manchester, Manchester, M1 7DN, United Kingdom; EPSRC/BBSRC Future Biomanufacturing Research Hub, Manchester Institute of Biotechnology, The University of Manchester, Manchester, M1 7DN, United Kingdom.
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26
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Forget SM, Xia F(R, Hein JE, Brumer H. Determination of biocatalytic parameters of a copper radical oxidase using real-time reaction progress monitoring. Org Biomol Chem 2020; 18:2076-2084. [DOI: 10.1039/c9ob02757b] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
VTNA is applied to reaction progress curves to glean key kinetic and mechanistic details for a copper radical oxidase.
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Affiliation(s)
- Stephanie M. Forget
- Department of Chemistry
- University of British Columbia
- Vancouver
- Canada
- Michael Smith Laboratories
| | - Fan (Roderick) Xia
- Department of Chemistry
- University of British Columbia
- Vancouver
- Canada
- Michael Smith Laboratories
| | - Jason E. Hein
- Department of Chemistry
- University of British Columbia
- Vancouver
- Canada
| | - Harry Brumer
- Department of Chemistry
- University of British Columbia
- Vancouver
- Canada
- Michael Smith Laboratories
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27
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Kim MJ, Gaube SM, Beh MHR, Smith CD, Thompson A. Synthesis and reactivity of 2-thionoester pyrroles: a route to 2-formyl pyrroles. RSC Adv 2019; 9:31773-31780. [PMID: 35527977 PMCID: PMC9072669 DOI: 10.1039/c9ra07527e] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2019] [Accepted: 09/20/2019] [Indexed: 12/05/2022] Open
Abstract
2-Functionalised pyrroles exhibit considerable synthetic utility. Herein, the synthesis and reactivity of 2-thionoester (-C(S)OR) pyrroles is reported. 2-Thionoester pyrroles were synthesised using a Knorr-type approach from aliphatic starting materials. 2-Thionoester pyrroles were reduced to the corresponding 2-formyl pyrroles, or the deuterated formyl variant, in one step using RANEY® nickel, thereby removing the need for the much-utilised hydrolysis/decarboxylation/formylation steps that are typically required to convert Knorr-type 2-carboxylate pyrroles into 2-formyl pyrroles. 2-Thionoester pyrroles proved tolerant of typical functional group interconversions for which the parent 2-carboxylate pyrroles have become known.
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Affiliation(s)
- Min Joon Kim
- Department of Chemistry, Dalhousie University P. O. Box 15000 Halifax NS B3H 4R2 Canada
| | - Sophie M Gaube
- Department of Chemistry, Dalhousie University P. O. Box 15000 Halifax NS B3H 4R2 Canada
| | - Michael H R Beh
- Department of Chemistry, Dalhousie University P. O. Box 15000 Halifax NS B3H 4R2 Canada
| | - Craig D Smith
- Department of Chemistry, Dalhousie University P. O. Box 15000 Halifax NS B3H 4R2 Canada
| | - Alison Thompson
- Department of Chemistry, Dalhousie University P. O. Box 15000 Halifax NS B3H 4R2 Canada
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28
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Belyaev A, Chen Y, Liu Z, Hindenberg P, Wu C, Chou P, Romero‐Nieto C, Koshevoy IO. Intramolecular Phosphacyclization: Polyaromatic Phosphonium P-Heterocycles with Wide-Tuning Optical Properties. Chemistry 2019; 25:6332-6341. [PMID: 30791177 PMCID: PMC6594060 DOI: 10.1002/chem.201900136] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2019] [Indexed: 01/08/2023]
Abstract
Rationally designed cationic phospha-polyaromatic fluorophores were prepared through intramolecular cyclization of the tertiary ortho-(acene)phenylene-phosphines mediated by CuII triflate. As a result of phosphorus quaternization, heterocyclic phosphonium salts 1 c-3 c, derived from naphthalene, phenanthrene, and anthracene cores, exhibited very intense blue to green fluorescence (Φem =0.38-0.99) and high photostability in aqueous medium. The structure-emission relationship was further investigated by tailoring the electron-donating functions to the anthracene moiety to give dyes 4 c-6 c with charge-transfer character. The latter significantly decreases the emission energy to reach near-IR region. Thus, the intramolecular phosphacyclization renders an ultra-wide tuning of fluorescence from 420 nm (1 c) to 780 nm (6 c) in solution, extended to 825 nm for 6 c in the solid state with quantum efficiency of approximately 0.07. The physical behavior of these new dyes was studied spectroscopically, crystallographically, and electrochemically, whereas computational analysis was used to correlate the experimental data with molecular electronic structures. The excellent stability, water solubility, and attractive photophysical characteristics make these phosphonium heterocycles powerful tools in cell imaging.
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Affiliation(s)
- Andrey Belyaev
- Department of ChemistryUniversity of Eastern FinlandYliopistokatu 780101JoensuuFinland
| | - Yi‐Ting Chen
- Department of ChemistryNational (Taiwan) UniversityTaipei106Taiwan
| | - Zong‐Ying Liu
- Department of ChemistryNational (Taiwan) UniversityTaipei106Taiwan
| | - Philip Hindenberg
- Organisch-Chemisches InstitutRuprecht-Karls-Universität HeidelbergIm Neuenheimer Feld 27069120HeidelbergGermany
| | - Cheng‐Ham Wu
- Department of ChemistryNational (Taiwan) UniversityTaipei106Taiwan
| | - Pi‐Tai Chou
- Department of ChemistryNational (Taiwan) UniversityTaipei106Taiwan
| | - Carlos Romero‐Nieto
- Organisch-Chemisches InstitutRuprecht-Karls-Universität HeidelbergIm Neuenheimer Feld 27069120HeidelbergGermany
- Faculty of PharmacyUniversity of Castilla-La ManchaCalle Almansa 14 - Edif. Bioincubadora02008AlbaceteSpain
| | - Igor O. Koshevoy
- Department of ChemistryUniversity of Eastern FinlandYliopistokatu 780101JoensuuFinland
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29
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Gawade PM, Khose VN, Badani PM, Hasan M, Kaabel S, Mobin SM, Borovkov V, Karnik AV. Benzyne-Mediated Nonconcerted Pathway toward Synthesis of Sterically Crowded [5]- and [7]Oxahelicenoids, Stereochemical and Theoretical Studies, and Optical Resolution of Helicenoids. J Org Chem 2018; 84:860-868. [DOI: 10.1021/acs.joc.8b02507] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Prashant M. Gawade
- Department of Chemistry, University of Mumbai, Vidayanagari, Santacruz (East), Mumbai 400098, India
| | - Vaibhav N. Khose
- Department of Chemistry, University of Mumbai, Vidayanagari, Santacruz (East), Mumbai 400098, India
| | - Purav M. Badani
- Department of Chemistry, University of Mumbai, Vidayanagari, Santacruz (East), Mumbai 400098, India
| | - Mohammed Hasan
- Department of Chemistry, University of Mumbai, Vidayanagari, Santacruz (East), Mumbai 400098, India
- Department of Chemistry and Biotechnology, Tallinn University of Technology, Akadeemia tee 15, Tallinn 12618, Estonia
- College of Chemistry and Materials Science, South Central University for Nationalities, 182# Minzu RD, Hongshan District, Wuhan, Hubei Province 430074, China
| | - Sandra Kaabel
- Department of Chemistry and Biotechnology, Tallinn University of Technology, Akadeemia tee 15, Tallinn 12618, Estonia
| | - Shaikh M. Mobin
- Departmentof Chemistry, Indian Institute of Technology Indore, Simrol, Khandwa Road, Indore 453552, India
| | - Victor Borovkov
- Department of Chemistry and Biotechnology, Tallinn University of Technology, Akadeemia tee 15, Tallinn 12618, Estonia
- College of Chemistry and Materials Science, South Central University for Nationalities, 182# Minzu RD, Hongshan District, Wuhan, Hubei Province 430074, China
| | - Anil V. Karnik
- Department of Chemistry, University of Mumbai, Vidayanagari, Santacruz (East), Mumbai 400098, India
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30
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Meunier-Prest R, Gruntz G, Castet F, Nicolas Y, Wannebroucq A, Bouvet M, Toupance T. Electrochemical and Spectroelectrochemical Behavior of a Tetracyanotriphenodioxazine in Solution and Thin-Films. ChemElectroChem 2018. [DOI: 10.1002/celc.201800646] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Rita Meunier-Prest
- Institut de Chimie Moléculaire de l'Université de Bourgogne (ICMUB) UMR 6302; CNRS; Université Bourgogne Franche-Comté; 9 avenue Alain Savary 21078 Dijon Cedex France
| | - Guillaume Gruntz
- C2M - ISM; Université de Bordeaux; 351 cours de la libération 33405 Talence Cedex France
| | - Frédéric Castet
- C2M - ISM; Université de Bordeaux; 351 cours de la libération 33405 Talence Cedex France
| | - Yohann Nicolas
- C2M - ISM; Université de Bordeaux; 351 cours de la libération 33405 Talence Cedex France
| | - Amélie Wannebroucq
- Institut de Chimie Moléculaire de l'Université de Bourgogne (ICMUB) UMR 6302; CNRS; Université Bourgogne Franche-Comté; 9 avenue Alain Savary 21078 Dijon Cedex France
| | - Marcel Bouvet
- Institut de Chimie Moléculaire de l'Université de Bourgogne (ICMUB) UMR 6302; CNRS; Université Bourgogne Franche-Comté; 9 avenue Alain Savary 21078 Dijon Cedex France
| | - Thierry Toupance
- C2M - ISM; Université de Bordeaux; 351 cours de la libération 33405 Talence Cedex France
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31
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Nie J, Patrocinio AOT, Hamid S, Sieland F, Sann J, Xia S, Bahnemann DW, Schneider J. New insights into the plasmonic enhancement for photocatalytic H2 production by Cu–TiO2 upon visible light illumination. Phys Chem Chem Phys 2018; 20:5264-5273. [DOI: 10.1039/c7cp07762a] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Cu nanoparticles were deposited on the surface of commercial TiO2 nanoparticles (Cu–TiO2) using different methods aiming at the production of highly efficient visible light photocatalysts.
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Affiliation(s)
- J. Nie
- Key Laboratory of Marine Chemistry Theory and Technology
- Ministry of Education
- College of Chemistry and Chemical Engineering
- Ocean University of China
- 266100 Qingdao
| | - A. O. T. Patrocinio
- Institut für Technische Chemie
- Leibniz Universität Hannover
- D-30167 Hannover
- Germany
- Laboratory of Photochemistry and Materials Science
| | - S. Hamid
- Institut für Technische Chemie
- Leibniz Universität Hannover
- D-30167 Hannover
- Germany
| | - F. Sieland
- Institut für Technische Chemie
- Leibniz Universität Hannover
- D-30167 Hannover
- Germany
| | - J. Sann
- Justus-Liebig-University Giessen
- Institute of Physical Chemistry
- 35392 Giessen
- Germany
| | - S. Xia
- Key Laboratory of Marine Chemistry Theory and Technology
- Ministry of Education
- College of Chemistry and Chemical Engineering
- Ocean University of China
- 266100 Qingdao
| | - D. W. Bahnemann
- Institut für Technische Chemie
- Leibniz Universität Hannover
- D-30167 Hannover
- Germany
- Laboratory “Photoactive Nanocomposite Materials”
| | - J. Schneider
- Institut für Technische Chemie
- Leibniz Universität Hannover
- D-30167 Hannover
- Germany
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Engineering oxidative stability in human hemoglobin based on the Hb providence (βK82D) mutation and genetic cross-linking. Biochem J 2017; 474:4171-4192. [PMID: 29070524 DOI: 10.1042/bcj20170491] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2017] [Revised: 10/04/2017] [Accepted: 10/23/2017] [Indexed: 12/24/2022]
Abstract
Previous work suggested that hemoglobin (Hb) tetramer formation slows autoxidation and hemin loss and that the naturally occurring mutant, Hb Providence (HbProv; βK82D), is much more resistant to degradation by H2O2 We have examined systematically the effects of genetic cross-linking of Hb tetramers with and without the HbProv mutation on autoxidation, hemin loss, and reactions with H2O2, using native HbA and various wild-type recombinant Hbs as controls. Genetically cross-linked Hb Presbyterian (βN108K) was also examined as an example of a low oxygen affinity tetramer. Our conclusions are: (a) at low concentrations, all the cross-linked tetramers show smaller rates of autoxidation and hemin loss than HbA, which can dissociate into much less stable dimers and (b) the HbProv βK82D mutation confers more resistance to degradation by H2O2, by markedly inhibiting oxidation of the β93 cysteine side chain, particularly in cross-linked tetramers and even in the presence of the destabilizing Hb Presbyterian mutation. These results show that cross-linking and the βK82D mutation do enhance the resistance of Hb to oxidative degradation, a critical element in the design of a safe and effective oxygen therapeutic.
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33
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Borowski D, Oechsner RM, Jürgens E, Ziegler T. Carbohydrate-Derived 3,2-Enolones in the Base-Catalyzed Rearrangement to Highly Functionalized C
4-Quaternary 4-Hydroxy-2-cyclopentenones. European J Org Chem 2017. [DOI: 10.1002/ejoc.201700846] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Daniel Borowski
- Institute of Organic Chemistry; University of Tuebingen; Auf der Morgenstelle 18 72076 Tuebingen Germany
| | - Regina M. Oechsner
- Institute of Organic Chemistry; University of Tuebingen; Auf der Morgenstelle 18 72076 Tuebingen Germany
| | - Eva Jürgens
- Institute of Inorganic Chemistry; University of Tuebingen; Auf der Morgenstelle 18 72076 Tuebingen Germany
| | - Thomas Ziegler
- Institute of Organic Chemistry; University of Tuebingen; Auf der Morgenstelle 18 72076 Tuebingen Germany
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34
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Kathiresan M, English AM. LC-MS/MS suggests that hole hopping in cytochrome c peroxidase protects its heme from oxidative modification by excess H 2O 2. Chem Sci 2017; 8:1152-1162. [PMID: 28451256 PMCID: PMC5369544 DOI: 10.1039/c6sc03125k] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2016] [Accepted: 09/06/2016] [Indexed: 12/20/2022] Open
Abstract
We recently reported that cytochrome c peroxidase (Ccp1) functions as a H2O2 sensor protein when H2O2 levels rise in respiring yeast. The availability of its reducing substrate, ferrocytochrome c (CycII), determines whether Ccp1 acts as a H2O2 sensor or peroxidase. For H2O2 to serve as a signal it must modify its receptor so we employed high-performance LC-MS/MS to investigate in detail the oxidation of Ccp1 by 1, 5 and 10 M eq. of H2O2 in the absence of CycII to prevent peroxidase activity. We observe strictly heme-mediated oxidation, implicating sequential cycles of binding and reduction of H2O2 at Ccp1's heme. This results in the incorporation of ∼20 oxygen atoms predominantly at methionine and tryptophan residues. Extensive intramolecular dityrosine crosslinking involving neighboring residues was uncovered by LC-MS/MS sequencing of the crosslinked peptides. The proximal heme ligand, H175, is converted to oxo-histidine, which labilizes the heme but irreversible heme oxidation is avoided by hole hopping to the polypeptide until oxidation of the catalytic distal H52 in Ccp1 treated with 10 M eq. of H2O2 shuts down heterolytic cleavage of H2O2 at the heme. Mapping of the 24 oxidized residues in Ccp1 reveals that hole hopping from the heme is directed to three polypeptide zones rich in redox-active residues. This unprecedented analysis unveils the remarkable capacity of a polypeptide to direct hole hopping away from its active site, consistent with heme labilization being a key outcome of Ccp1-mediated H2O2 signaling. LC-MS/MS identification of the oxidized residues also exposes the bias of electron paramagnetic resonance (EPR) detection toward transient radicals with low O2 reactivity.
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Affiliation(s)
- Meena Kathiresan
- Concordia University Faculty of Arts and Science, and PROTEOhttp://www.proteo.ca/index.html , Chemistry and Biochemistry , Montreal , Canada .
| | - Ann M English
- Concordia University Faculty of Arts and Science, and PROTEOhttp://www.proteo.ca/index.html , Chemistry and Biochemistry , Montreal , Canada .
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35
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Li Y, Wang T, Zhao C, Qin Y, Meng H, Nie M, Jiang L, Wang C. A magnetoreception system constructed by a dysprosium metallofullerene and nitroxide radical. Dalton Trans 2017; 46:8938-8941. [DOI: 10.1039/c7dt01761h] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
A site-specific magnetoreception system between Dy3N@C80 and nitroxide radical through spin-paramagnet interaction.
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Affiliation(s)
- Yongjian Li
- Beijing National Laboratory for Molecular Sciences
- Key Laboratory of Molecular Nanostructure and Nanotechnology
- Institute of Chemistry
- Chinese Academy of Science
- 100190 Beijing
| | - Taishan Wang
- Beijing National Laboratory for Molecular Sciences
- Key Laboratory of Molecular Nanostructure and Nanotechnology
- Institute of Chemistry
- Chinese Academy of Science
- 100190 Beijing
| | - Chong Zhao
- Beijing National Laboratory for Molecular Sciences
- Key Laboratory of Molecular Nanostructure and Nanotechnology
- Institute of Chemistry
- Chinese Academy of Science
- 100190 Beijing
| | - Yu Qin
- Beijing National Laboratory for Molecular Sciences
- Key Laboratory of Molecular Nanostructure and Nanotechnology
- Institute of Chemistry
- Chinese Academy of Science
- 100190 Beijing
| | - Haibing Meng
- Beijing National Laboratory for Molecular Sciences
- Key Laboratory of Molecular Nanostructure and Nanotechnology
- Institute of Chemistry
- Chinese Academy of Science
- 100190 Beijing
| | - Mingzhe Nie
- Beijing National Laboratory for Molecular Sciences
- Key Laboratory of Molecular Nanostructure and Nanotechnology
- Institute of Chemistry
- Chinese Academy of Science
- 100190 Beijing
| | - Li Jiang
- Beijing National Laboratory for Molecular Sciences
- Key Laboratory of Molecular Nanostructure and Nanotechnology
- Institute of Chemistry
- Chinese Academy of Science
- 100190 Beijing
| | - Chunru Wang
- Beijing National Laboratory for Molecular Sciences
- Key Laboratory of Molecular Nanostructure and Nanotechnology
- Institute of Chemistry
- Chinese Academy of Science
- 100190 Beijing
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36
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Rahman MT, Deschamps JR, Imler GH, Schwabacher AW, Cook JM. Total Synthesis of Macrocarpines D and E via an Enolate-Driven Copper-Mediated Cross-Coupling Process: Replacement of Catalytic Palladium with Copper Iodide. Org Lett 2016; 18:4174-7. [PMID: 27526647 DOI: 10.1021/acs.orglett.6b01526] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
An enolate driven copper-mediated cross-coupling process enabled cheaper and greener access to the key pentacyclic intermediates required for the enantiospecific total synthesis of a number of C-19 methyl substituted sarpagine/macroline indole alkaloids. Replacement of palladium (60-68%) with copper iodide (82-89%) resulted in much higher yields. The formation of an unusual 7-membered cross-coupling product was completely inhibited by using TEMPO as a radical scavenger. Further functionalization led to the first enantiospecific total synthesis of macrocarpines D and E.
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Affiliation(s)
- M Toufiqur Rahman
- Department of Chemistry & Biochemistry, University of Wisconsin-Milwaukee , 3210 North Cramer Street, Milwaukee, Wisconsin 53211, United States
| | - Jeffrey R Deschamps
- Center for Biomolecular Science and Engineering, Naval Research Laboratory , Code 6930, Washington, DC 20375, United States
| | | | - Alan W Schwabacher
- Department of Chemistry & Biochemistry, University of Wisconsin-Milwaukee , 3210 North Cramer Street, Milwaukee, Wisconsin 53211, United States
| | - James M Cook
- Department of Chemistry & Biochemistry, University of Wisconsin-Milwaukee , 3210 North Cramer Street, Milwaukee, Wisconsin 53211, United States
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37
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Development of an LC–MS method for ultra trace-level determination of 2,2,6,6-tetramethylpiperidine-1-oxl (TEMPO), a potential genotoxic impurity within active pharmaceutical ingredients. J Pharm Biomed Anal 2015; 114:488-92. [DOI: 10.1016/j.jpba.2015.04.008] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2015] [Revised: 04/01/2015] [Accepted: 04/03/2015] [Indexed: 11/21/2022]
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38
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Kassa T, Jana S, Strader MB, Meng F, Jia Y, Wilson MT, Alayash AI. Sickle Cell Hemoglobin in the Ferryl State Promotes βCys-93 Oxidation and Mitochondrial Dysfunction in Epithelial Lung Cells (E10). J Biol Chem 2015; 290:27939-58. [PMID: 26396189 DOI: 10.1074/jbc.m115.651257] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2015] [Indexed: 01/02/2023] Open
Abstract
Polymerization of intraerythrocytic deoxyhemoglobin S (HbS) is the primary molecular event that leads to hemolytic anemia in sickle cell disease (SCD). We reasoned that HbS may contribute to the complex pathophysiology of SCD in part due to its pseudoperoxidase activity. We compared oxidation reactions and the turnover of oxidation intermediates of purified human HbS and HbA. Hydrogen peroxide (H2O2) drives a catalytic cycle that includes the following three distinct steps: 1) initial oxidation of ferrous (oxy) to ferryl Hb; 2) autoreduction of the ferryl intermediate to ferric (metHb); and 3) reaction of metHb with an additional H2O2 molecule to regenerate the ferryl intermediate. Ferrous and ferric forms of both proteins underwent initial oxidation to the ferryl heme in the presence of H2O2 at equal rates. However, the rate of autoreduction of ferryl to the ferric form was slower in the HbS solutions. Using quantitative mass spectrometry and the spin trap, 5,5-dimethyl-1-pyrroline-N-oxide, we found more irreversibly oxidized βCys-93in HbS than in HbA. Incubation of the ferric or ferryl HbS with cultured lung epithelial cells (E10) induced a drop in mitochondrial oxygen consumption rate and impairment of cellular bioenergetics that was related to the redox state of the iron. Ferryl HbS induced a substantial drop in the mitochondrial transmembrane potential and increases in cytosolic heme oxygenase (HO-1) expression and mitochondrial colocalization in E10 cells. Thus, highly oxidizing ferryl Hb and heme, the product of oxidation, may be central to the evolution of vasculopathy in SCD and may suggest therapeutic modalities that interrupt heme-mediated inflammation.
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Affiliation(s)
- Tigist Kassa
- From the Laboratory of Biochemistry and Vascular Biology, Center for Biologics Evaluation and Research, Food and Drug Administration, Silver Spring, Maryland 20993 and
| | - Sirsendu Jana
- From the Laboratory of Biochemistry and Vascular Biology, Center for Biologics Evaluation and Research, Food and Drug Administration, Silver Spring, Maryland 20993 and
| | - Michael Brad Strader
- From the Laboratory of Biochemistry and Vascular Biology, Center for Biologics Evaluation and Research, Food and Drug Administration, Silver Spring, Maryland 20993 and
| | - Fantao Meng
- From the Laboratory of Biochemistry and Vascular Biology, Center for Biologics Evaluation and Research, Food and Drug Administration, Silver Spring, Maryland 20993 and
| | - Yiping Jia
- From the Laboratory of Biochemistry and Vascular Biology, Center for Biologics Evaluation and Research, Food and Drug Administration, Silver Spring, Maryland 20993 and
| | - Michael T Wilson
- the Department of Biological Sciences, University of Essex, Wivenhoe Park, Colchester CO4 3SQ, United Kingdom
| | - Abdu I Alayash
- From the Laboratory of Biochemistry and Vascular Biology, Center for Biologics Evaluation and Research, Food and Drug Administration, Silver Spring, Maryland 20993 and
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39
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Sato K, Sukegawa T, Oyaizu K, Nishide H. Synthesis of Poly(TEMPO-Substituted Glycidyl Ether) by Utilizingt-BuOK/18-Crown-6 for an Organic Cathode-Active Material. ACTA ACUST UNITED AC 2015. [DOI: 10.1002/masy.201300224] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Kan Sato
- Department of Applied Chemistry; Waseda University; Tokyo 169-8555 Japan
| | - Takashi Sukegawa
- Department of Applied Chemistry; Waseda University; Tokyo 169-8555 Japan
| | - Kenichi Oyaizu
- Department of Applied Chemistry; Waseda University; Tokyo 169-8555 Japan
| | - Hiroyuki Nishide
- Department of Applied Chemistry; Waseda University; Tokyo 169-8555 Japan
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40
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Suzuka M, Hara S, Sekiguchi T, Oyaizu K, Nishide H. Kinetic Control of Electron Transfer at Doped Zinc Oxide/Redox-active Molecule Interface for Photocurrent Rectification. CHEM LETT 2015. [DOI: 10.1246/cl.140872] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Michio Suzuka
- Department of Applied Chemistry, Waseda University
- Device Solutions Center, Panasonic Corporation
| | - Shu Hara
- Department of Applied Chemistry, Waseda University
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41
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Yu H, Cao L, Li F, Wu Q, Li Q, Wang S, Guo Y. The antioxidant mechanism of nitroxide TEMPO: scavenging with glutathionyl radicals. RSC Adv 2015. [DOI: 10.1039/c5ra06129f] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A rhodamine-nitroxide probe (R-NO˙) was introduced to probe glutathionyl radicals (GS˙) with high sensitivity and selectivity.
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Affiliation(s)
- Hui Yu
- Key Laboratory of Chemistry of Northwestern Plant Resources
- CAS and Key Laboratory for Natural Medicine of Gansu Province
- Lanzhou Institute of Chemical Physics
- Chinese Academy of Sciences
- Lanzhou 730000
| | - Linying Cao
- Key Laboratory of Chemistry of Northwestern Plant Resources
- CAS and Key Laboratory for Natural Medicine of Gansu Province
- Lanzhou Institute of Chemical Physics
- Chinese Academy of Sciences
- Lanzhou 730000
| | - Feifei Li
- Institute of Modern Physics
- Chinese Academy of Sciences
- Lanzhou 730000
- P. R. China
- University of Chinese Academy of Sciences
| | - Qingfeng Wu
- Institute of Modern Physics
- Chinese Academy of Sciences
- Lanzhou 730000
- P. R. China
| | - Qiang Li
- Institute of Modern Physics
- Chinese Academy of Sciences
- Lanzhou 730000
- P. R. China
| | - Shuai Wang
- Key Laboratory of Chemistry of Northwestern Plant Resources
- CAS and Key Laboratory for Natural Medicine of Gansu Province
- Lanzhou Institute of Chemical Physics
- Chinese Academy of Sciences
- Lanzhou 730000
| | - Yong Guo
- Key Laboratory of Chemistry of Northwestern Plant Resources
- CAS and Key Laboratory for Natural Medicine of Gansu Province
- Lanzhou Institute of Chemical Physics
- Chinese Academy of Sciences
- Lanzhou 730000
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42
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43
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Toba R, Gotoh H, Sakakibara K. Scavenging and characterization of short-lived radicals using a novel stable nitroxide radical with a characteristic UV-vis absorption spectrum. Org Lett 2014; 16:3868-71. [PMID: 25019641 DOI: 10.1021/ol501328k] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A stable tert-butyl(10-phenyl-9-anthryl)nitroxide (BPAN) radical was newly synthesized and used for the capture/characterization of reactive radicals. Adducts obtained from the reactions of BPAN with in situ generated reactive radicals showed excellent stability, assuring complete isolation and purification. The structures of the adducts were established by LC-MS and NMR analyses.
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Affiliation(s)
- Ryuta Toba
- Department of Applied Chemistry, Yokohama National University , 79-5 Tokiwadai, Hodogayaku, Yokohama 240-8501 Japan
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44
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Miner KD, Pfister TD, Hosseinzadeh P, Karaduman N, Donald LJ, Loewen PC, Lu Y, Ivancich A. Identifying the elusive sites of tyrosyl radicals in cytochrome c peroxidase: implications for oxidation of substrates bound at a site remote from the heme. Biochemistry 2014; 53:3781-9. [PMID: 24901481 PMCID: PMC4063442 DOI: 10.1021/bi500353p] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
The location of the Trp radical and the catalytic function of the [Fe(IV)═O Trp₁₉₁(•+)] intermediate in cytochrome c peroxidase (CcP) are well-established; however, the unambiguous identification of the site(s) for the formation of tyrosyl radical(s) and their possible biological roles remain elusive. We have now performed a systematic investigation of the location and reactivity of the Tyr radical(s) using multifrequency Electron Paramagnetic Resonance (EPR) spectroscopy combined with multiple-site Trp/Tyr mutations in CcP. Two tyrosines, Tyr71 and Tyr236, were identified as those contributing primarily to the EPR spectrum of the tyrosyl radical, recorded at 9 and 285 GHz. The EPR characterization also showed that the heme distal-side Trp51 is involved in the intramolecular electron transfer between Tyr71 and the heme and that formation of Tyr₇₁(•) and Tyr₂₃₆(•) is independent of the [Fe(IV)═O Trp₁₉₁(•+)] intermediate. Tyr71 is located in an optimal position to mediate the oxidation of substrates binding at a site, more than 20 Å from the heme, which has been reported recently in the crystal structures of CcP with bound guaicol and phenol [Murphy, E. J., et al. (2012) FEBS J. 279, 1632-1639]. The possibility of discriminating the radical intermediates by their EPR spectra allowed us to identify Tyr₇₁(•) as the reactive species with the guaiacol substrate. Our assignment of the surface-exposed Tyr236 as the other radical site agrees well with previous studies based on MNP labeling and protein cross-linking [Tsaprailis, G., and English, A. M. (2003) JBIC, J. Biol. Inorg. Chem. 8, 248-255] and on its covalent modification upon reaction of W191G CcP with 2-aminotriazole [Musah, R. A., and Goodin, D. B. (1997) Biochemistry 36, 11665-11674]. Accordingly, while Tyr71 acts as a true reactive intermediate for the oxidation of certain small substrates that bind at a site remote from the heme, the surface-exposed Tyr236 would be more likely related to oxidative stress signaling, as previously proposed. Our findings reinforce the view that CcP is the monofunctional peroxidase that most closely resembles its ancestor enzymes, the catalase-peroxidases, in terms of the higher complexity of the peroxidase reaction [Colin, J., et al. (2009) J. Am. Chem. Soc. 131, 8557-8563]. The strategy used to identify the elusive Tyr radical sites in CcP may be applied to other heme enzymes containing a large number of Tyr and Trp residues and for which Tyr (or Trp) radicals have been proposed to be involved in their peroxidase or peroxidase-like reaction.
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Affiliation(s)
- Kyle D Miner
- CNRS, Unité de Recherche Mixte CNRS/CEA/Université Paris-Sud (UMR 8221), Laboratoire de Bioénergétique, Métalloprotéines et Stress. Centre d'Etudes de Saclay, iBiTec-S, 91191 Gif-sur-Yvette, France
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45
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Moure MJ, SanMartin R, Domínguez E. Copper Pincer Complexes as Advantageous Catalysts for the Heteroannulation ofortho-Halophenols and Alkynes. Adv Synth Catal 2014. [DOI: 10.1002/adsc.201301010] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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46
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Bagryanskaya EG, Marque SRA. Scavenging of organic C-centered radicals by nitroxides. Chem Rev 2014; 114:5011-56. [PMID: 24571361 DOI: 10.1021/cr4000946] [Citation(s) in RCA: 81] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Elena G Bagryanskaya
- N.N. Vorozhtsov Novosibirsk Institute of Organic Chemistry, Siberian Branch of the Russian Academy of Sciences , Pr. Lavrentjeva 9, Novosibirsk 630090, Russia
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47
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Hawkins CL, Davies MJ. Detection and characterisation of radicals in biological materials using EPR methodology. Biochim Biophys Acta Gen Subj 2014; 1840:708-21. [DOI: 10.1016/j.bbagen.2013.03.034] [Citation(s) in RCA: 141] [Impact Index Per Article: 14.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2013] [Accepted: 03/28/2013] [Indexed: 12/21/2022]
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48
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Zhang X. Single electron transfer between selectfluor and chloride: A mass spectrometric and theoretical study. J Mol Struct 2013. [DOI: 10.1016/j.molstruc.2013.07.009] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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49
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The carbonylation and covalent dimerization of human superoxide dismutase 1 caused by its bicarbonate-dependent peroxidase activity is inhibited by the radical scavenger tempol. Biochem J 2013; 455:37-46. [DOI: 10.1042/bj20130180] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The nitroxide tempol inhibited the carbonylation and covalent dimerization of human superoxide dismutase 1 caused by its bicarbonate-dependent peroxidase activity. Tempol acted by scavenging the produced carbonate radical and by recombining with hSOD1-Trp32• radicals as indicated by MS/MS evidence.
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50
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Xiang Z. Hydrogen abstraction/nucleophilic addition: A novel reaction pathway between aromatic olefin radical cation and TEMPO. J Mol Struct 2012. [DOI: 10.1016/j.molstruc.2012.06.063] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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