51
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Su J, Liu X, Hu J, You Q, Cui Y, Chen Y. Photo-induced controlled radical polymerization of methyl methacrylate mediated by photosensitive nitroxides. POLYM INT 2015. [DOI: 10.1002/pi.4859] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Jiahui Su
- Guangdong Provincial Key Laboratory of Functional Soft Condensed Matter, Department of Polymeric Materials and Engineering, School of Materials and Energy; Guangdong University of Technology; Guangzhou 510006 PR China
| | - Xiaoxuan Liu
- Guangdong Provincial Key Laboratory of Functional Soft Condensed Matter, Department of Polymeric Materials and Engineering, School of Materials and Energy; Guangdong University of Technology; Guangzhou 510006 PR China
| | - Junqi Hu
- Guangdong Provincial Key Laboratory of Functional Soft Condensed Matter, Department of Polymeric Materials and Engineering, School of Materials and Energy; Guangdong University of Technology; Guangzhou 510006 PR China
| | - Qin You
- Guangdong Provincial Key Laboratory of Functional Soft Condensed Matter, Department of Polymeric Materials and Engineering, School of Materials and Energy; Guangdong University of Technology; Guangzhou 510006 PR China
| | - Yanyan Cui
- Guangdong Provincial Key Laboratory of Functional Soft Condensed Matter, Department of Polymeric Materials and Engineering, School of Materials and Energy; Guangdong University of Technology; Guangzhou 510006 PR China
| | - Yingyin Chen
- Guangdong Provincial Key Laboratory of Functional Soft Condensed Matter, Department of Polymeric Materials and Engineering, School of Materials and Energy; Guangdong University of Technology; Guangzhou 510006 PR China
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52
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A sensitive and selective chemosensor for ascorbic acid based on a fluorescent nitroxide switch. Talanta 2015; 132:191-6. [DOI: 10.1016/j.talanta.2014.08.066] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2014] [Revised: 08/20/2014] [Accepted: 08/27/2014] [Indexed: 01/03/2023]
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53
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Zheng T, Boyle A, Robson Marsden H, Valdink D, Martelli G, Raap J, Kros A. Probing coiled-coil assembly by paramagnetic NMR spectroscopy. Org Biomol Chem 2015; 13:1159-68. [DOI: 10.1039/c4ob02125h] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Here a new method to determine the orientation of coiled-coil peptide motifs is described.
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Affiliation(s)
- TingTing Zheng
- Dept. Supramolecular & Biomaterials Chemistry
- Leiden Institute of Chemistry
- Leiden University
- Leiden
- The Netherlands
| | - Aimee Boyle
- Dept. Supramolecular & Biomaterials Chemistry
- Leiden Institute of Chemistry
- Leiden University
- Leiden
- The Netherlands
| | - Hana Robson Marsden
- Dept. Supramolecular & Biomaterials Chemistry
- Leiden Institute of Chemistry
- Leiden University
- Leiden
- The Netherlands
| | - Dayenne Valdink
- Dept. Supramolecular & Biomaterials Chemistry
- Leiden Institute of Chemistry
- Leiden University
- Leiden
- The Netherlands
| | - Giuliana Martelli
- Dept. Supramolecular & Biomaterials Chemistry
- Leiden Institute of Chemistry
- Leiden University
- Leiden
- The Netherlands
| | - Jan Raap
- Dept. Supramolecular & Biomaterials Chemistry
- Leiden Institute of Chemistry
- Leiden University
- Leiden
- The Netherlands
| | - Alexander Kros
- Dept. Supramolecular & Biomaterials Chemistry
- Leiden Institute of Chemistry
- Leiden University
- Leiden
- The Netherlands
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54
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Dynamic, in vivo, real-time detection of retinal oxidative status in a model of elevated intraocular pressure using a novel, reversibly responsive, profluorescent nitroxide probe. Exp Eye Res 2014; 129:48-56. [DOI: 10.1016/j.exer.2014.10.013] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2014] [Revised: 10/15/2014] [Accepted: 10/16/2014] [Indexed: 12/15/2022]
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55
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Hughes BK, Braunecker WA, Ferguson AJ, Kemper TW, Larsen RE, Gennett T. Quenching of the Perylene Fluorophore by Stable Nitroxide Radical-Containing Macromolecules. J Phys Chem B 2014; 118:12541-8. [PMID: 25329883 DOI: 10.1021/jp506240j] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Barbara K. Hughes
- Chemical and Materials
Science Center, National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, Colorado 80401, United States
| | - Wade A. Braunecker
- Chemical and Materials
Science Center, National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, Colorado 80401, United States
| | - Andrew J. Ferguson
- Chemical and Materials
Science Center, National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, Colorado 80401, United States
| | - Travis W. Kemper
- Chemical and Materials
Science Center, National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, Colorado 80401, United States
| | - Ross E. Larsen
- Chemical and Materials
Science Center, National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, Colorado 80401, United States
| | - Thomas Gennett
- Chemical and Materials
Science Center, National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, Colorado 80401, United States
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56
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Mechanism of fluorophore quenching in a pre-fluorescent nitroxide probe: A theoretical illustration. Chem Phys Lett 2014. [DOI: 10.1016/j.cplett.2013.12.059] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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57
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Gatto E, Bocchinfuso G, Palleschi A, Oncea S, De Zotti M, Formaggio F, Toniolo C, Venanzi M. 3D structure, dynamics, and activity of synthetic analog of the peptaibiotic trichodecenin I. Chem Biodivers 2013; 10:887-903. [PMID: 23681732 DOI: 10.1002/cbdv.201200388] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2012] [Indexed: 11/07/2022]
Abstract
In this contribution, we report on the conformational preferences of synthetic analogs of the antimicrobial peptide trichodecenin I in solution. This 6-amino acid residue long peptide is characterized by a single, strongly helicogenic Aib residue in the central part of the sequence and is rich in the conformationally mobile Gly residues. It has been reported that, in CHCl3 solution and in the crystal state, this peptaibiotic adopts a non-helical, multiple β-turn conformation, whereas a 310 /α-helical structure was obtained from an X-ray diffraction study on a trichodecenin I analog (TDT4W6) containing the fluorescent Trp residue in position 6 (replacing Ile) and an equally helicogenic TOAC residue in position 4 (replacing Aib). In this work, we applied spectroscopic techniques and molecular-dynamics calculations, in particular, on the fluorescent TDT4W6 trichodecenin I analog with the aim at investigating its 3D-structural and dynamical features in solution. Our results revealed that TDT4W6 can be described by an ensemble of conformers quickly interconverting in the nanosecond time scale. The most populated cluster has a conformation similar to the NMR structure of native trichodecenin I in CHCl3 . However, also helical-like conformers are present, even if poorly populated and less stable under the analytical conditions.
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Affiliation(s)
- Emanuela Gatto
- Department of Chemical Sciences and Technologies, University of Rome 'Tor Vergata', I-00133 Rome.
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58
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Matkó J, Mátyus L, Szöllösi J, Bene L, Jenei A, Nagy P, Bodnár A, Damjanovich S. Analysis of cell surface molecular distributions and cellular signaling by flow cytometry. J Fluoresc 2013; 4:303-14. [PMID: 24233604 DOI: 10.1007/bf01881445] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/1993] [Indexed: 11/28/2022]
Abstract
Flow cytometry is a fast analysis and separation method for large cell populations, based on collection and processing of optical signals gained on a cell-by-cell basis. These optical signals are scattered light and fluorescence. Owing to its unique potential ofStatistical data analysis and sensitive monitoring of (micro)heterogeneities in large cell populations, flow cytometry-in combination with microscopic imaging techniques-is a powerful tool to study molecular details of cellular signal transduction processes as well. The method also has a widespread clinical application, mostly in analysis of lymphocyte subpopulations for diagnostic (or research) purposes in diseases related to the immune system. A special application of flow cytometry is the mapping of molecular interactions (proximity relationships between membrane proteins) at the cell surface, on a cell-by-cell basis. We developed two approaches to study such questions; both are based ondistance-dependent quenching of excited state fluorophores (donors) by fluorescent or dark (nitroxide radical) acceptors via Förstertype dipole-dipole resonance energy transfer (FRET) and long-range electron transfer (LRET) mechanisms, respectively. A critical evaluation of these methods using donor- or acceptor-conjugated monoclonal antibodies (or their Fab fragments) to select the appropriate cell surface receptor or antigen will be presented in comparison with other approaches for similar purposes. The applicability of FRET and LRET for two-dimensional antigen mapping as well as for detection of conformational changes in extracellular domains of membrane-bound proteins is discussed and illustrated by examples of several lymphoma cell lines. Another special application area of flow cytometry is the analysis of different aspects of cellular signal transduction, e.g., changes of intracellular ion (Ca(2+), H(+), Na(+)) concentrations, regulation of ion channel activities, or more complex physiological responses of cell to external stimuli via correlated fluorescence and scatter signal analysis, on a cell-by-cell basis. This way different signaling events such as changes in membrane permeability, membrane potential, cell size and shape, ion distribution, cell density, chromatin structure, etc., can be easily and quickly monitored over large cell populations with the advantage of revealing microheterogeneities in the cellular responses. Flow cytometry also offers the possibility to follow the kinetics of slow (minute- and hour-scale) biological processes in cell populations. These applications are illustrated by the example of complex flow cytometric analysis of signaling in extracellular ATP-triggered apoptosis (programmed cell death) of murine thymic lymphocytes.
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Affiliation(s)
- J Matkó
- Department of Biophysics, University School of Medicine, 4012, Debrecen, Hungary
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59
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Chow YL, Johansson CI. Extended Fluorescence Quenching Analysis as a Remote Probe of Non-Emissive Exciplexes. J CHIN CHEM SOC-TAIP 2013. [DOI: 10.1002/jccs.199300086] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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60
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Impellizzeri S, Stamplecoskie KG, Scaiano JC. Sensitized excited free-radical processes as read–write tools: impact on non-linear lithographic processes. Phys Chem Chem Phys 2013; 15:14873-8. [DOI: 10.1039/c3cp51723c] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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61
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Matsuoka Y, Yamato M, Yamasaki T, Mito F, Yamada KI. Rapid and convenient detection of ascorbic acid using a fluorescent nitroxide switch. Free Radic Biol Med 2012; 53:2112-8. [PMID: 23026412 DOI: 10.1016/j.freeradbiomed.2012.09.032] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/10/2012] [Revised: 08/23/2012] [Accepted: 09/24/2012] [Indexed: 11/29/2022]
Abstract
Ascorbic acid is a small-molecule reductant with multiple functions in vivo. Reducing ascorbic acid intake leads to a lack of hydroxylation of prolines and lysines, causing a looser triple helix and resulting in scurvy. Ascorbic acid also acts as an antioxidant to prevent oxidative stress. Because ascorbic acid is related to disease states, rapid and convenient detection of ascorbic acid should be useful in diagnosis. Nitroxide is reduced to the corresponding hydroxylamine by ascorbic acid and a sensitive and novel approach to its detection employs covalent coupling of nitroxide with a fluorophore, leading to intramolecular quenching of fluorescence emission by electron-exchange interactions. Here, we developed a new fluorophore-nitroxide probe, Naph-DiPy nitroxide, for ascorbic acid. Naph-DiPy nitroxide rapidly reacted with ascorbic acid and showed fluorescence enhancement, but not in response to other reductants or reactive oxygen species. To confirm the practical usefulness of the fluorophore-nitroxide probe, we demonstrated the use of Naph-DiPy nitroxide for the measurement of ascorbic acid in the plasma of osteogenic disorder Shionogi rats when fed an ascorbic acid-deficient diet. The results suggest that this novel fluorophore-nitroxide probe could sensitively and easily detect ascorbic acid and be useful as a tool for the diagnosis of disease states.
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Affiliation(s)
- Yuta Matsuoka
- Department of Bio-functional Science, Faculty of Pharmaceutical Sciences, Kyushu University, Fukuoka 812-8582, Japan
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62
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Zhang Y, Del Vecchio R, Blough NV. Investigating the mechanism of hydrogen peroxide photoproduction by humic substances. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2012; 46:11836-43. [PMID: 23046212 DOI: 10.1021/es3029582] [Citation(s) in RCA: 111] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
The mechanism(s) by which hydrogen peroxide (H(2)O(2)) is photoproduced by humic substances and chromophoric dissolved organic matter was probed by examining the dependence of the initial H(2)O(2) photoproduction rate (R(H(2)O(2))) and apparent H(2)O(2) quantum yields on dioxygen concentration for both untreated and borohydride-reduced samples. Although borohydride reduction substantially reduced light absorption, the R(H(2)O(2)) values were largely unaffected. Apparent monochromatic and polychromatic quantum yields thus increased following reduction. The results indicate that light absorption by charge-transfer states or by (aromatic) ketone/aldehydes does not lead to significant H(2)O(2) photoproduction. High concentrations of triplet quenchers relative to that of dioxygen produced only small decreases (sorbic acid) or small increases (Cl(-) and Br(-)) in R(H(2)O(2)), indicating that neither (1)O(2) nor excited triplet states of quinones contribute significantly to H(2)O(2) photoproduction. The dependence of R(H(2)O(2)) on O(2) concentration provides evidence that the intermediate(s) reacting with O(2) to produce superoxide are relatively long-lived (approximately tens of microseconds or more). Evidence of the photochemical formation of O(2)-reducing intermediates under anaerobic conditions was also obtained; these reducing intermediates appeared to be relatively stable in the absence of O(2). Our data suggest that these O(2)-reducing intermediates are generated by intramolecular electron transfer from short-lived excited states of electron donors to ground-state acceptors.
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Affiliation(s)
- Yi Zhang
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20740, USA
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63
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Flicker TM, Green SA. Detection and separation of gas-phase carbon-centered radicals from cigarette smoke and diesel exhaust. Anal Chem 2012; 70:2008-12. [PMID: 21651292 DOI: 10.1021/ac970858f] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Carbon-centered radicals were trapped from gas-phase cigarette smoke and diesel engine exhaust by reaction with a nitroxide, 3-amino-2,2,5,5-tetramethyl-1-pyrrolidinyloxy (3AP). The resulting mixture of stable, diamagnetic adducts was derivatized with naphthalenedicarboxaldehyde (NDA) to produce highly fluorescent products. Derivatives were separated by high-performance liquid chromatography (HPLC), which revealed distinctly different suites of radicals present in the two systems. Integration of HPLC peaks gave approximately 22 ± 7 nmol of radicals per cigarette and 3 ± 1 nmol of radicals per liter of diesel engine exhaust. An estimated 8-10 different carbon-centered radical species are present in each system.
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Affiliation(s)
- T M Flicker
- Chemistry Department, Michigan Technological University, Houghton, Michigan 49931-1295
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64
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65
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Hirosawa S, Arai S, Takeoka S. A TEMPO-conjugated fluorescent probe for monitoring mitochondrial redox reactions. Chem Commun (Camb) 2012; 48:4845-7. [PMID: 22506265 DOI: 10.1039/c2cc30603d] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report a mitochondrial targeted redox probe (MitoRP) that comprises a nitroxide radical (TEMPO) moiety and coumarin 343. Using isolated mitochondria in the presence/absence of substrates and inhibitors of oxidative phosphorylation, we demonstrated that MitoRP is a useful probe to monitor the electron flow associated with complex I.
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Affiliation(s)
- Shota Hirosawa
- Department of Life Science and Medical Bioscience, Graduate School of Advanced Science and Engineering, Waseda University (TWIns), Tokyo 162-8480, Japan
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66
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Yan GP, Fairfull-Smith KE, Smith CD, Hanson GR, Bottle SE. Porphyrin containing isoindoline nitroxides as potential fluorescence sensors of free radicals. J PORPHYR PHTHALOCYA 2012. [DOI: 10.1142/s1088424611003203] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
A series of new spin-labeled porphyrin containing isoindoline nitroxide moieties were synthesized and characterized as potential free radical fluorescence sensors. Fluorescence-suppression was observed in the free-base monoradical porphyrins, whilst the free-base biradical porphyrins exhibited highly suppressed fluorescence about three times greater than the monoradical porphyrins. The observed fluorescence-suppression was attributed to enhanced intersystem crossing resulting from electronexchange between the doublet nitroxide and the excited porphyrin fluorophore. Notably, fluorescencesuppression was not as strong in the related metalated porphyrins, possibly due to insufficient spin coupling between the nitroxide and the porphyrin. Continuous wave EPR spectroscopy of the diradical porphyrins in fluid solution suggests that the nitroxyl-nitroxyl interspin distance is long enough and tumbling is fast enough not to detect dipolar coupling.
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Affiliation(s)
- Guo-Ping Yan
- School of Material Science and Engineering, Wuhan Institute of Technology, Wuhan 430073, P.R. China
- ARC Centre of Excellence for Free Radical Chemistry and Biotechnology, Chemistry Discipline, Faculty of Science and Technology, Queensland University of Technology, Brisbane, QLD 4001, Australia
| | - Kathryn E. Fairfull-Smith
- ARC Centre of Excellence for Free Radical Chemistry and Biotechnology, Chemistry Discipline, Faculty of Science and Technology, Queensland University of Technology, Brisbane, QLD 4001, Australia
| | - Craig D. Smith
- ARC Centre of Excellence for Free Radical Chemistry and Biotechnology, Chemistry Discipline, Faculty of Science and Technology, Queensland University of Technology, Brisbane, QLD 4001, Australia
| | - Graeme R. Hanson
- Centre for Advanced Imaging, The University of Queensland, St. Lucia, QLD 4072, Australia
| | - Steven E. Bottle
- ARC Centre of Excellence for Free Radical Chemistry and Biotechnology, Chemistry Discipline, Faculty of Science and Technology, Queensland University of Technology, Brisbane, QLD 4001, Australia
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67
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Borozdina YB, Kamm V, Laquai F, Baumgarten M. Tuning the sensitivity of fluorophore–nitroxide radicals. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm31390a] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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68
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Kertész J, Bognár B, Kormos A, Móczár I, Baranyai P, Kubinyi M, Kálai T, Hideg K, Huszthy P. Synthesis and metal ion complexation of spin labeled 18-crown-6 ethers containing an acridone or an acridine fluorophore unit. Tetrahedron 2011. [DOI: 10.1016/j.tet.2011.09.092] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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69
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Matveeva AG, Glebov EM, Korolev VV, Pozdnyakov IP, Plyusnin VF, Stass DV, Reznikov VA. Luminescent properties of new naphthylnitroxyl radicals. HIGH ENERGY CHEMISTRY 2011. [DOI: 10.1134/s0018143911050134] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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70
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Mito F, Kitagawa K, Yamasaki T, Shirahama C, Oishi T, Ito Y, Yamato M, Yamada KI. Oxygen concentration dependence of lipid peroxidation and lipid-derived radical generation: Application of profluorescent nitroxide switch. Free Radic Res 2011; 45:1103-10. [DOI: 10.3109/10715762.2011.595410] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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71
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Colvin MT, Smeigh AL, Giacobbe EM, Conron SMM, Ricks AB, Wasielewski MR. Ultrafast Intersystem Crossing and Spin Dynamics of Zinc meso-Tetraphenylporphyrin Covalently Bound to Stable Radicals. J Phys Chem A 2011; 115:7538-49. [DOI: 10.1021/jp2021006] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Michael T. Colvin
- Department of Chemistry and Argonne−Northwestern Solar Energy Research (ANSER) Center, Northwestern University, Evanston, Illinois 60208-3113, United States
| | - Amanda L. Smeigh
- Department of Chemistry and Argonne−Northwestern Solar Energy Research (ANSER) Center, Northwestern University, Evanston, Illinois 60208-3113, United States
| | - Emilie M. Giacobbe
- Department of Chemistry and Argonne−Northwestern Solar Energy Research (ANSER) Center, Northwestern University, Evanston, Illinois 60208-3113, United States
| | - Sarah M. Mickley Conron
- Department of Chemistry and Argonne−Northwestern Solar Energy Research (ANSER) Center, Northwestern University, Evanston, Illinois 60208-3113, United States
| | - Annie Butler Ricks
- Department of Chemistry and Argonne−Northwestern Solar Energy Research (ANSER) Center, Northwestern University, Evanston, Illinois 60208-3113, United States
| | - Michael R. Wasielewski
- Department of Chemistry and Argonne−Northwestern Solar Energy Research (ANSER) Center, Northwestern University, Evanston, Illinois 60208-3113, United States
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72
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Affiliation(s)
- Meredith R. Cline
- Department of Chemistry; Johns Hopkins University; 3400 N. Charles Street; Baltimore; MD; 21218; USA
| | - John P. Toscano
- Department of Chemistry; Johns Hopkins University; 3400 N. Charles Street; Baltimore; MD; 21218; USA
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73
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Morris JC, McMurtrie JC, Bottle SE, Fairfull-Smith KE. Generation of Profluorescent Isoindoline Nitroxides Using Click Chemistry. J Org Chem 2011; 76:4964-72. [DOI: 10.1021/jo200613r] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jason C. Morris
- ARC Centre of Excellence for Free Radical Chemistry and Biotechnology and ‡Chemistry Discipline, Faculty of Science and Technology, Queensland University of Technology, Queensland 4001, Australia
| | - John C. McMurtrie
- ARC Centre of Excellence for Free Radical Chemistry and Biotechnology and ‡Chemistry Discipline, Faculty of Science and Technology, Queensland University of Technology, Queensland 4001, Australia
| | - Steven E. Bottle
- ARC Centre of Excellence for Free Radical Chemistry and Biotechnology and ‡Chemistry Discipline, Faculty of Science and Technology, Queensland University of Technology, Queensland 4001, Australia
| | - Kathryn E. Fairfull-Smith
- ARC Centre of Excellence for Free Radical Chemistry and Biotechnology and ‡Chemistry Discipline, Faculty of Science and Technology, Queensland University of Technology, Queensland 4001, Australia
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74
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Hong J, Zhuang Y, Ji X, Guo X. A long-lived luminescence and EPR bimodal lanthanide-based probe for free radicals. Analyst 2011; 136:2464-70. [PMID: 21556434 DOI: 10.1039/c0an00914h] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We developed a novel spin-labeled terbium complex Tb(3+)/cs124-DTPA-TEMPO (1) by covalently labeling a nitroxide radical on the terbium complex for monitoring free radicals of various areas. This lanthanide complex probe shows a high EPR signal which resulted from the nitroxide radical moiety, and is weakly luminescent which resulted from the intramolecular quenching effect of the nitroxide radical on sensitised terbium luminescence. The intensity of both the EPR and luminescence can be modulated by eliminating the paramagnetism of the nitroxide radical through recognition of a carbon-centered radical analyte and thus gives a quantification of the analyte. We have preliminarily applied this probe in the luminescent detection of model carbon-centered radicals and hydroxyl radicals (·OH). This probe is water-soluble and contains lanthanide-luminescence properties, favorable for the time-resolved luminescence technique. The investigation of the intramolecular quenching process has showed that the labeled nitroxide radical quenches multiple excited states of the terbium complex, resulting in highly efficient quenching of terbium luminescence. This probe is the first example of intramolecular modulation of lanthanide luminescence by a nitroxide radical.
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Affiliation(s)
- Jinqing Hong
- The Key Laboratory for Chemical Biology of Fujian Province, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, China
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75
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Strömqvist J, Chmyrov A, Johansson S, Andersson A, Mäler L, Widengren J. Quenching of triplet state fluorophores for studying diffusion-mediated reactions in lipid membranes. Biophys J 2011; 99:3821-30. [PMID: 21112307 DOI: 10.1016/j.bpj.2010.09.059] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2010] [Revised: 09/14/2010] [Accepted: 09/28/2010] [Indexed: 11/16/2022] Open
Abstract
An approach to study bimolecular interactions in model lipid bilayers and biological membranes is introduced, exploiting the influence of membrane-associated electron spin resonance labels on the triplet state kinetics of membrane-bound fluorophores. Singlet-triplet state transitions within the dye Lissamine Rhodamine B (LRB) were studied, when free in aqueous solutions, with LRB bound to a lipid in a liposome, and in the presence of different local concentrations of the electron spin resonance label TEMPO. By monitoring the triplet state kinetics via variations in the fluorescence signal, in this study using fluorescence correlation spectroscopy, a strong fluorescence signal can be combined with the ability to monitor low-frequency molecular interactions, at timescales much longer than the fluorescence lifetimes. Both in solution and in membranes, the measured relative changes in the singlet-triplet transitions rates were found to well reflect the expected collisional frequencies between the LRB and TEMPO molecules. These collisional rates could also be monitored at local TEMPO concentrations where practically no quenching of the excited state of the fluorophores can be detected. The proposed strategy is broadly applicable, in terms of possible read-out means, types of molecular interactions that can be followed, and in what environments these interactions can be measured.
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Affiliation(s)
- Johan Strömqvist
- Experimental Biomolecular Physics, Department of Applied Physics, Royal Institute of Technology, Albanova University Center, Stockholm, Sweden
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76
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Colwell JM, Blinco JP, Hulbert C, Fairfull-Smith KE, Bottle SE. A Profluorescent Azaphenalene Nitroxide for Nitroxide-Mediated Polymerization. Aust J Chem 2011. [DOI: 10.1071/ch10404] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
A novel nitroxide‐mediated polymerization (NMP) control agent; 1,1,3,3‐tetramethyl‐2,3‐dihydro‐2‐azaphenalen‐2‐yloxyl (TMAO), was used in the free‐radical polymerization of styrene. The conversion of styrene during NMP was studied using FT‐Raman spectroscopy and the effectiveness of TMAO as a NMP control agent was assessed by GPC analysis. Fidelity of the TMAO‐alkoxyamine end‐group on the synthesized polymers was confirmed by GPC, UV‐Vis and fluorescence spectroscopic analyses. Comparison to the well known NMP control agent, TEMPO was made. TMAO showed control of molecular weight approaching that of TEMPO. Attempts to improve the properties of TMAO as an NMP control agent by synthesizing an analogue with bulkier substituents around the nitroxide did not generate the target molecule but demonstrated some of the interesting chemistry of the azaphenalene ring system.
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77
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Blinco JP, Fairfull-Smith KE, Morrow BJ, Bottle SE. Profluorescent Nitroxides as Sensitive Probes of Oxidative Change and Free Radical Reactions. Aust J Chem 2011. [DOI: 10.1071/ch10442] [Citation(s) in RCA: 89] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
This paper presents a review on the use of tethered nitroxide–fluorophore molecules as probes of oxidative change and free radical generation and reaction. The proximity of the nitroxide free radical to the fluorophore suppresses the normal fluorescence emission process. Nitroxide free radical scavenging, metabolism or redox chemistry return the system to its natural fluorescent state and so these tethered nitroxide–fluorophore molecules are described as being profluorescent. A survey of profluorescent nitroxides found in the literature is provided as well as background on the mechanism of action and applications of these compounds as fluorometric probes within the fields of biological, materials and environmental sciences.
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78
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Tsentalovich YP, Yanshole VV, Polienko YF, Morozov SV, Grigor’ev IA. Deactivation of Excited States of Kynurenine Covalently Linked to Nitroxides. Photochem Photobiol 2010; 87:22-31. [DOI: 10.1111/j.1751-1097.2010.00841.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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79
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Intra- and intermolecular quenching of carbazole photoluminescence by imidazolidine radicals. Russ Chem Bull 2010. [DOI: 10.1007/s11172-010-0160-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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80
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Düppe PM, Talbierski PM, Hornig FS, Rauen U, Korth HG, Wille T, Boese R, Omlor T, de Groot H, Sustmann R. Pyrene-Based Fluorescent Nitric Oxide Cheletropic Traps (FNOCTs) for the Detection of Nitric Oxide in Cell Cultures and Tissues. Chemistry 2010; 16:11121-32. [DOI: 10.1002/chem.201000029] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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81
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Morrow BJ, Keddie DJ, Gueven N, Lavin MF, Bottle SE. A novel profluorescent nitroxide as a sensitive probe for the cellular redox environment. Free Radic Biol Med 2010; 49:67-76. [PMID: 20350596 DOI: 10.1016/j.freeradbiomed.2010.03.019] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/08/2009] [Revised: 03/16/2010] [Accepted: 03/18/2010] [Indexed: 11/27/2022]
Abstract
Changes to the redox status of biological systems have been implicated in the pathogenesis of a wide variety of disorders. Sensitive quantification of these changes has been developed using a novel fluorescent probe containing a redox-sensitive nitroxide moiety. As well as being able to selectively detect the superoxide radical in vitro, this method can measure overall changes to the cellular redox environment using flow cytometry on the basis of nitroxide reduction. The reversible nature of the probe's detection mechanism offers the unique advantage of being able to monitor redox changes in both oxidizing and reducing directions in real time.
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Affiliation(s)
- Benjamin J Morrow
- ARC Centre of Excellence for Free Radical Chemistry, School of Physical and Chemical Sciences, Queensland University of Technology, Brisbane, QLD 4001, Australia
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82
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Li P, Xie T, Duan X, Yu F, Wang X, Tang B. A New Highly Selective and Sensitive Assay for Fluorescence Imaging of.OH in Living Cells: Effectively Avoiding the Interference of Peroxynitrite. Chemistry 2010; 16:1834-40. [DOI: 10.1002/chem.200901514] [Citation(s) in RCA: 73] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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83
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Colvin MT, Giacobbe EM, Cohen B, Miura T, Scott AM, Wasielewski MR. Competitive Electron Transfer and Enhanced Intersystem Crossing in Photoexcited Covalent TEMPO−Perylene-3,4:9,10-bis(dicarboximide) Dyads: Unusual Spin Polarization Resulting from the Radical−Triplet Interaction. J Phys Chem A 2010; 114:1741-8. [DOI: 10.1021/jp909212c] [Citation(s) in RCA: 83] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Michael T. Colvin
- Department of Chemistry and Argonne-Northwestern Solar Energy Research (ANSER) Center, Northwestern University, Evanston, Illinois 60208-3113
| | - Emilie M. Giacobbe
- Department of Chemistry and Argonne-Northwestern Solar Energy Research (ANSER) Center, Northwestern University, Evanston, Illinois 60208-3113
| | - Boiko Cohen
- Department of Chemistry and Argonne-Northwestern Solar Energy Research (ANSER) Center, Northwestern University, Evanston, Illinois 60208-3113
| | - Tomoaki Miura
- Department of Chemistry and Argonne-Northwestern Solar Energy Research (ANSER) Center, Northwestern University, Evanston, Illinois 60208-3113
| | - Amy M. Scott
- Department of Chemistry and Argonne-Northwestern Solar Energy Research (ANSER) Center, Northwestern University, Evanston, Illinois 60208-3113
| | - Michael R. Wasielewski
- Department of Chemistry and Argonne-Northwestern Solar Energy Research (ANSER) Center, Northwestern University, Evanston, Illinois 60208-3113
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84
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Jia M, Tang Y, Lam YF, Green SA, Blough NV. Prefluorescent Nitroxide Probe for the Highly Sensitive Determination of Peroxyl and Other Radical Oxidants. Anal Chem 2009; 81:8033-40. [DOI: 10.1021/ac901374m] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Min Jia
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, and Chemistry Department, Michigan Technological University, Houghton, Michigan 49931
| | - Yu Tang
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, and Chemistry Department, Michigan Technological University, Houghton, Michigan 49931
| | - Yiu-Fai Lam
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, and Chemistry Department, Michigan Technological University, Houghton, Michigan 49931
| | - Sarah A. Green
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, and Chemistry Department, Michigan Technological University, Houghton, Michigan 49931
| | - Neil V. Blough
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, and Chemistry Department, Michigan Technological University, Houghton, Michigan 49931
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85
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Saito T, Koopal LK, Nagasaki S, Tanaka S. Electrostatic potentials of humic acid: Fluorescence quenching measurements and comparison with model calculations. Colloids Surf A Physicochem Eng Asp 2009. [DOI: 10.1016/j.colsurfa.2008.10.038] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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86
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87
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Liu Y, Liu S, Wang Y. TEMPO-based Redox-sensitive Fluorescent Probes and Their Applications to Evaluating Intracellular Redox Status in Living Cells. CHEM LETT 2009. [DOI: 10.1246/cl.2009.588] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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88
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Kollár J, Hrdlovič P, Chmela Š. Synthesis and spectral characteristics of substituted 1,8-naphthalimides: Intramolecular quenching by mono-nitroxides. J Photochem Photobiol A Chem 2009. [DOI: 10.1016/j.jphotochem.2009.03.018] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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89
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Giacobbe EM, Mi Q, Colvin MT, Cohen B, Ramanan C, Scott AM, Yeganeh S, Marks TJ, Ratner MA, Wasielewski MR. Ultrafast Intersystem Crossing and Spin Dynamics of Photoexcited Perylene-3,4:9,10-bis(dicarboximide) Covalently Linked to a Nitroxide Radical at Fixed Distances. J Am Chem Soc 2009; 131:3700-12. [DOI: 10.1021/ja808924f] [Citation(s) in RCA: 106] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Emilie M. Giacobbe
- Department of Chemistry, Argonne-Northwestern Solar Energy Research (ANSER) Center, and International Institute for Nanotechnology, Northwestern University, Evanston, Illinois 60208-3113
| | - Qixi Mi
- Department of Chemistry, Argonne-Northwestern Solar Energy Research (ANSER) Center, and International Institute for Nanotechnology, Northwestern University, Evanston, Illinois 60208-3113
| | - Michael T. Colvin
- Department of Chemistry, Argonne-Northwestern Solar Energy Research (ANSER) Center, and International Institute for Nanotechnology, Northwestern University, Evanston, Illinois 60208-3113
| | - Boiko Cohen
- Department of Chemistry, Argonne-Northwestern Solar Energy Research (ANSER) Center, and International Institute for Nanotechnology, Northwestern University, Evanston, Illinois 60208-3113
| | - Charusheela Ramanan
- Department of Chemistry, Argonne-Northwestern Solar Energy Research (ANSER) Center, and International Institute for Nanotechnology, Northwestern University, Evanston, Illinois 60208-3113
| | - Amy M. Scott
- Department of Chemistry, Argonne-Northwestern Solar Energy Research (ANSER) Center, and International Institute for Nanotechnology, Northwestern University, Evanston, Illinois 60208-3113
| | - Sina Yeganeh
- Department of Chemistry, Argonne-Northwestern Solar Energy Research (ANSER) Center, and International Institute for Nanotechnology, Northwestern University, Evanston, Illinois 60208-3113
| | - Tobin J. Marks
- Department of Chemistry, Argonne-Northwestern Solar Energy Research (ANSER) Center, and International Institute for Nanotechnology, Northwestern University, Evanston, Illinois 60208-3113
| | - Mark A. Ratner
- Department of Chemistry, Argonne-Northwestern Solar Energy Research (ANSER) Center, and International Institute for Nanotechnology, Northwestern University, Evanston, Illinois 60208-3113
| | - Michael R. Wasielewski
- Department of Chemistry, Argonne-Northwestern Solar Energy Research (ANSER) Center, and International Institute for Nanotechnology, Northwestern University, Evanston, Illinois 60208-3113
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90
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Lovell JF, Chen J, Jarvi MT, Cao WG, Allen AD, Liu Y, Tidwell TT, Wilson BC, Zheng G. FRET Quenching of Photosensitizer Singlet Oxygen Generation. J Phys Chem B 2009; 113:3203-11. [DOI: 10.1021/jp810324v] [Citation(s) in RCA: 111] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Jonathan F. Lovell
- Institute of Biomaterials and Biomedical Engineering, Department of Medical Biophysics and Department of Chemistry, University of Toronto, Canada, Division of Biophysics and Bioimaging, Ontario Cancer Institute, Toronto, ON M5G 1L7, Canada, and Department of Chemistry, Shanghai University, China
| | - Juan Chen
- Institute of Biomaterials and Biomedical Engineering, Department of Medical Biophysics and Department of Chemistry, University of Toronto, Canada, Division of Biophysics and Bioimaging, Ontario Cancer Institute, Toronto, ON M5G 1L7, Canada, and Department of Chemistry, Shanghai University, China
| | - Mark T. Jarvi
- Institute of Biomaterials and Biomedical Engineering, Department of Medical Biophysics and Department of Chemistry, University of Toronto, Canada, Division of Biophysics and Bioimaging, Ontario Cancer Institute, Toronto, ON M5G 1L7, Canada, and Department of Chemistry, Shanghai University, China
| | - Wei-Guo Cao
- Institute of Biomaterials and Biomedical Engineering, Department of Medical Biophysics and Department of Chemistry, University of Toronto, Canada, Division of Biophysics and Bioimaging, Ontario Cancer Institute, Toronto, ON M5G 1L7, Canada, and Department of Chemistry, Shanghai University, China
| | - Annette D. Allen
- Institute of Biomaterials and Biomedical Engineering, Department of Medical Biophysics and Department of Chemistry, University of Toronto, Canada, Division of Biophysics and Bioimaging, Ontario Cancer Institute, Toronto, ON M5G 1L7, Canada, and Department of Chemistry, Shanghai University, China
| | - Yuanqin Liu
- Institute of Biomaterials and Biomedical Engineering, Department of Medical Biophysics and Department of Chemistry, University of Toronto, Canada, Division of Biophysics and Bioimaging, Ontario Cancer Institute, Toronto, ON M5G 1L7, Canada, and Department of Chemistry, Shanghai University, China
| | - Thomas T. Tidwell
- Institute of Biomaterials and Biomedical Engineering, Department of Medical Biophysics and Department of Chemistry, University of Toronto, Canada, Division of Biophysics and Bioimaging, Ontario Cancer Institute, Toronto, ON M5G 1L7, Canada, and Department of Chemistry, Shanghai University, China
| | - Brian C. Wilson
- Institute of Biomaterials and Biomedical Engineering, Department of Medical Biophysics and Department of Chemistry, University of Toronto, Canada, Division of Biophysics and Bioimaging, Ontario Cancer Institute, Toronto, ON M5G 1L7, Canada, and Department of Chemistry, Shanghai University, China
| | - Gang Zheng
- Institute of Biomaterials and Biomedical Engineering, Department of Medical Biophysics and Department of Chemistry, University of Toronto, Canada, Division of Biophysics and Bioimaging, Ontario Cancer Institute, Toronto, ON M5G 1L7, Canada, and Department of Chemistry, Shanghai University, China
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91
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Yeganeh S, Wasielewski MR, Ratner MA. Enhanced Intersystem Crossing in Three-Spin Systems: A Perturbation Theory Treatment. J Am Chem Soc 2009; 131:2268-73. [DOI: 10.1021/ja807590q] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Sina Yeganeh
- Department of Chemistry, Center for Nanofabrication and Molecular Self Assembly, Materials Research Science and Engineering Center, and Argonne−Northwestern Solar Energy Research (ANSER) Center, Northwestern University, Evanston, Illinois 60208-3113
| | - Michael R. Wasielewski
- Department of Chemistry, Center for Nanofabrication and Molecular Self Assembly, Materials Research Science and Engineering Center, and Argonne−Northwestern Solar Energy Research (ANSER) Center, Northwestern University, Evanston, Illinois 60208-3113
| | - Mark A. Ratner
- Department of Chemistry, Center for Nanofabrication and Molecular Self Assembly, Materials Research Science and Engineering Center, and Argonne−Northwestern Solar Energy Research (ANSER) Center, Northwestern University, Evanston, Illinois 60208-3113
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92
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Sato S, Tsunoda M, Suzuki M, Kutsuna M, Takido-uchi K, Shindo M, Mizuguchi H, Obara H, Ohya H. Synthesis and spectral properties of polymethine-cyanine dye-nitroxide radical hybrid compounds for use as fluorescence probes to monitor reducing species and radicals. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2009; 71:2030-2039. [PMID: 18790663 DOI: 10.1016/j.saa.2008.07.045] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/14/2008] [Revised: 07/24/2008] [Accepted: 07/27/2008] [Indexed: 05/26/2023]
Abstract
Various hybrid compounds comprised of two types of nitroxide radicals and either a pentamethine (Cy5) or trimethine cyanine (Cy3) were synthesized. The nitroxide radicals were linked either via an ester-bond to one or two N-alkyl carboxyl-terminated groups of Cy5, or via two amido-bonds (aminocarbonyl or carbonylamino group) to the 5-position of the indolenine moieties of Cy5 and Cy3. Changes in fluorescence and ESR intensities of the hybrid compounds were measured before and after addition of Na ascorbate in PBS (pH 7.0) to reduce the radicals. Among the hybrid compounds synthesized, those that linked the nitroxide radicals via an aminocarbonyl residue at the 5-position of the indolenine moieties on Cy5 and Cy3 exhibited a 1.8- and 5.1-fold increase in fluorescence intensity with the reduction of the nitroxide segment by the addition of Na ascorbate, respectively. In contrast, fluorescence intensity was not enhanced in the other hybrid compounds. Thus, the hybrid compounds which exhibited an increase in fluorescent intensity with radical reduction can be used in the quantitative measurement of reducing species such as Fe(2+) and ascorbic acid, and hydroxyl radicals. Because these hybrid compounds have the advantage of fluorescing at longer wavelengths-661 (Cy5) or 568 (Cy3)nm, respectively, they can be used to measure radical-reducing species or radicals either in solution or in vivo.
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Affiliation(s)
- Shingo Sato
- Graduate School of Science and Engineering, Yamagata University, Yonezawa-shi, Yamagata 992-8510, Japan.
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93
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Dou W, Su X. Study on the interaction between nitroxide free radical and conjugated polyelectrolytes by fluorimetry. LUMINESCENCE 2009; 24:45-9. [DOI: 10.1002/bio.1062] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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94
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Bueno C, Mikelsons L, Maretti L, Scaiano JC, Aspée A. Photophysical Properties of the Prefluorescent Nitroxide Probes QT and C343T. Photochem Photobiol 2008; 84:1535-42. [DOI: 10.1111/j.1751-1097.2008.00381.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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95
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Fairfull-Smith KE, Bottle SE. The Synthesis and Physical Properties of Novel Polyaromatic Profluorescent Isoindoline Nitroxide Probes. European J Org Chem 2008. [DOI: 10.1002/ejoc.200800597] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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96
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Sato S, Suzuki M, Soma T, Tsunoda M. Synthesis and properties of umbelliferone-nitroxide radical hybrid compounds as fluorescence and spin-label probes. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2008; 70:799-804. [PMID: 18029225 DOI: 10.1016/j.saa.2007.09.015] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/21/2007] [Revised: 08/30/2007] [Accepted: 09/18/2007] [Indexed: 05/25/2023]
Abstract
Two hybrid compounds 6 and 7, linked via an ester-bond between the 7-hydroxyl residue of an umbelliferone 1 and a carboxylic acid residue of two nitroxide radicals 3 and 4, and one hybrid compound 8, linked via an ester-bond between a 3-carboxylic acid residue of umbelliferone 2 and a hydroxyl residue of nitroxide radical 5, were synthesized in good yields, and their fluorescence and ESR spectra before and after the addition of L-ascorbic acid sodium salt in PBS (pH 7.0) were measured. The ESR intensities of 6 and 7 were proportionally reduced after the addition of ascorbic acid sodium salt, and their fluorescence intensities were increased maximally by eight- and nine-fold, respectively. However, the fluorescence intensity of 8 was essentially unchanged.
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Affiliation(s)
- Shingo Sato
- Department of Chemistry and Chemical Engineering, Faculty of Engineering, Yamagata University, 4-3-16 Jonan, Yonezawa-shi, Yamagata 992-8510, Japan.
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97
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Chen W, Wang X, Tu X, Pei D, Zhao Y, Guo X. Water-soluble off-on spin-labeled quantum-dots conjugate. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2008; 4:759-764. [PMID: 18500770 DOI: 10.1002/smll.200700788] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Affiliation(s)
- Wenbin Chen
- Department of Chemistry, The MOE Key Laboratory of Analytical Science, Xiamen University, Xiamen, 361005, P.R. China
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98
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Aliaga C, Juárez-Ruiz JM, Scaiano JC, Aspée A. Hydrogen-Transfer Reactions from Phenols to TEMPO Prefluorescent Probes in Micellar Systems. Org Lett 2008; 10:2147-50. [DOI: 10.1021/ol800446c] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Carolina Aliaga
- Facultad de Química y Biología, Universidad de Santiago de Chile, Casilla 40 Correo 33, Santiago de Chile, Department of Chemistry, University of Ottawa, Ottawa, Canada K1N 6N5
| | - Juan M. Juárez-Ruiz
- Facultad de Química y Biología, Universidad de Santiago de Chile, Casilla 40 Correo 33, Santiago de Chile, Department of Chemistry, University of Ottawa, Ottawa, Canada K1N 6N5
| | - J. C. Scaiano
- Facultad de Química y Biología, Universidad de Santiago de Chile, Casilla 40 Correo 33, Santiago de Chile, Department of Chemistry, University of Ottawa, Ottawa, Canada K1N 6N5
| | - Alexis Aspée
- Facultad de Química y Biología, Universidad de Santiago de Chile, Casilla 40 Correo 33, Santiago de Chile, Department of Chemistry, University of Ottawa, Ottawa, Canada K1N 6N5
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99
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Zhu Q, Lian Y, Thyagarajan S, Rokita SE, Karlin KD, Blough NV. Hydrogen Peroxide and Dioxygen Activation by Dinuclear Copper Complexes in Aqueous Solution: Hydroxyl Radical Production Initiated by Internal Electron Transfer. J Am Chem Soc 2008; 130:6304-5. [DOI: 10.1021/ja800080z] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Qing Zhu
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, and Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218
| | - Yuxiang Lian
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, and Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218
| | - Sunita Thyagarajan
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, and Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218
| | - Steven E. Rokita
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, and Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218
| | - Kenneth D. Karlin
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, and Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218
| | - Neil V. Blough
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, and Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218
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100
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Matveeva AG, Sviridenko FB, Korolev VV, Kuibida LV, Stass DV, Shundrin LA, Reznikov VA, Grampp GG. Difficulties in building radiation-generated three-spin systems using spin-labeled luminophores. J Phys Chem A 2008; 112:183-93. [PMID: 18088106 DOI: 10.1021/jp076835e] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Aromatic compounds are well-known acceptors of primary radical ions that are formed under high-energy irradiation of nonpolar systems. Thus formed radical ion pairs recombine and produce magnetosensitive fluorescence, which helps study the short-lived radical ions. It was initially suggested that a simple introduction of a spin label into the original arene would allow an easy transition from two-spin to three-spin systems, retaining the experimental techniques available for radical pairs. However, it turned out that spin-labeled arenes often do not produce magnetosensitive fluorescence in the conditions of a conventional radiochemical experiment. To understand the effect of the introduced spin label, we synthesized a series of compounds with the general structure "stable 3-imidazoline radical-two-carbon bridge-naphthalene" as well as their diamagnetic analogues. By use of this set of acceptors, we determined the processes that ruin the observed signal and established their connection with the chemical structure of the compound. We found that the compounds with flexible (saturated) two-carbon bridges between the luminophore and the stable radical moieties exist in solution in folded conformation, which leads to suppression of luminescence from naphthalene due to efficient through-space exchange quenching of the excited state by the radical. Increasing the rigidity of the bridge by introducing the double bond drastically increases the reactivity of the extended pi-system. In these compounds, the energy released upon recombination is spent in radiationless processes of chemical transformations both at the stage of the radical ion and at the stage of the electronically excited molecule.
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Affiliation(s)
- Anna G Matveeva
- Institute of Chemical Kinetics and Combustion SB RAS, ul. Institutskaya, 3, 630090 Novosibirsk, Russia
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