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Journal articles on the topic 'Shift nitroxides'

Author: Grafiati

Published: 25 May 2024

Last updated: 31 July 2025

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1

Sweger, Sarah R., Vasyl P. Denysenkov, Lutz Maibaum, Thomas F. Prisner, and Stefan Stoll. "The effect of spin polarization on double electron–electron resonance (DEER) spectroscopy." Magnetic Resonance 3, no. 1 (2022): 101–10. http://dx.doi.org/10.5194/mr-3-101-2022.

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Abstract. Double electron–electron resonance (DEER) spectroscopy measures the distribution of distances between two electron spins in the nanometer range, often on doubly spin-labeled proteins, via the modulation of a refocused spin echo by the dipolar interaction between the spins. DEER is commonly conducted under conditions where the polarization of the spins is small. Here, we examine the DEER signal under conditions of high spin polarization, thermally obtainable at low temperatures and high magnetic fields, and show that the signal acquires a polarization-dependent out-of-phase component

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2

Maryunina, Kseniya Yu, Xiao Zhang, Sadafumi Nishihara, et al. "A heterospin pressure sensor." Journal of Materials Chemistry C 3, no. 30 (2015): 7788–91. http://dx.doi.org/10.1039/c5tc01005e.

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3

Bonesteel, Jo-Anne K., Babul Borah, and Richard D. Bates. "Effects of nitroxide free radicals on proton donor chemical shifts." Journal of Magnetic Resonance (1969) 98, no. 3 (1992): 475–82. http://dx.doi.org/10.1016/0022-2364(92)90002-o.

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4

Kirste, B. "EPR and ENDOR Investigations of a Cholestane Spin Probe in Liquid Crystals." Zeitschrift für Naturforschung A 42, no. 11 (1987): 1296–304. http://dx.doi.org/10.1515/zna-1987-1112.

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A detailed ENDOR study of anisotropic proton hyperfine shifts in the nitroxide spin probe 3-doxylcholestane (CSL) in liquid-crystalline solution is described. The data are interpreted by means of theoretically calculated proton hyperfine tensors (McConnell-Strathdee-Derbyshire treatment), providing an independent check of the ordering matrix. The orientational order and the dynamic behavior of the nematic and smectic phases of the liquid crystals (40,6), (50,6), and 8CB are investigated by EPR using CSL and phenalenyl as spin probes.

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5

Maupu, Alexandre, Yara Kanawati, Adrien Métafiot, and Milan Maric. "Ethylene Glycol Dicyclopentenyl (Meth)Acrylate Homo and Block Copolymers via Nitroxide Mediated Polymerization." Materials 12, no. 9 (2019): 1547. http://dx.doi.org/10.3390/ma12091547.

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Nitroxide-mediated polymerization (NMP), (homo and block copolymerization with styrene (S) and butyl methacrylate/S) of ethylene glycol dicyclopentenyl ether (meth)acrylates (EGDEA and EGDEMA) was studied using BlocBuilder alkoxyamines. EGDEA homopolymerization was not well-controlled, independent of temperature (90–120 °C), or additional free nitroxide (0–10 mol%) used. Number average molecular weights (Mn) achieved for poly(EGDEA) were 4.0–9.5 kg mol−1 and were accompanied by high dispersity (Ð = Mw/Mn = 1.62–2.09). Re-initiation and chain extension of the poly(EGDEA) chains with styrene (S)

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6

Bales, Barney L., Francis L. Harris, Mirna Peric, and Miroslav Peric. "Electron Paramagnetic Resonance Line Shifts and Line Shape Changes Due to Spin Exchange of Nitroxide Free Radicals in Liquids. 7. Singly Charged Surfactant Nitroxide." Journal of Physical Chemistry A 113, no. 33 (2009): 9295–303. http://dx.doi.org/10.1021/jp905335r.

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7

Anžlovar, Alojz, Mohor Mihelčič, Iztok Švab, David Pahovnik, and Ema Žagar. "Dynamic Crosslinking of LDPE by Nitroxide Radical Coupling of a Dicyclopentadiene Dicarboxylic Acid and Its Dynamic Properties." Polymers 17, no. 11 (2025): 1536. https://doi.org/10.3390/polym17111536.

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LDPE was crosslinked with novel dynamic or conventional crosslinking agents during melt processing. Both crosslinkers were synthesized by the esterification of Thiele’s acid or adipic acid with 4-hydroxy-TEMPO. 1H-NMR showed that a temperature of 170 °C and a reaction time of 24 min are required for a successful crosslinking. The concentrations of crosslinking agents were 1.45, 2.9, and 5.8 mol%. Conventionally crosslinked LDPEs show a decrease in soluble content in hot xylene with increased crosslinker concentrations, while dynamically crosslinked LDPEs show no change after thermal treatment,

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8

Romanenko, G. V., S. E. Tolstikov, E. V. Tretyakov, S. V. Fokin, V. N. Ikorskii, and V. I. Ovcharenko. "Shift of stereochemical nonrigidity from coordination units to polymethylene fragments in heterospin copper(II) hexafluoroacetylacetonate complexes with nitronyl nitroxide biradicals." Russian Chemical Bulletin 56, no. 9 (2007): 1795–804. http://dx.doi.org/10.1007/s11172-007-0279-6.

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9

Bales, Barney L., and Miroslav Peric. "EPR Line Shifts and Line Shape Changes Due to Spin Exchange of Nitroxide Free Radicals in Liquids." Journal of Physical Chemistry B 101, no. 43 (1997): 8707–16. http://dx.doi.org/10.1021/jp970995g.

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10

Sarkar, Riddhiman, Arnaud Comment, Paul R. Vasos, et al. "Proton NMR of (15)N-choline metabolites enhanced by dynamic nuclear polarization." Journal of the American Chemical Society 131, no. 44 (2009): 16014–15. https://doi.org/10.1021/ja9021304.

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International audience ; Chemical shifts of protons can report on metabolic transformations such as the conversion of choline to phosphocholine. To follow such processes in vivo, magnetization can be enhanced by dynamic nuclear polarization (DNP). We have hyperpolarized in this manner nitrogen-15 spins in (15)N-labeled choline up to 3.3% by irradiating the 94 GHz electron spin resonance of admixed TEMPO nitroxide radicals in a magnetic field of 3.35 T during ca. 3 h at 1.2 K. The sample was subsequently transferred to a high-resolution magnet, and the enhanced polarization was converted from (

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11

Hwang, Jimmy S., and Ghassan A. Oweimreen. "Relating static shifts in the ESR spectra of a nitroxide radical in solution to second order perturbation theory." Concepts in Magnetic Resonance Part A 30A, no. 6 (2007): 349–57. http://dx.doi.org/10.1002/cmr.a.20096.

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12

Mancini, Giordano, Marco Fusè, Filippo Lipparini, Michele Nottoli, Giovanni Scalmani, and Vincenzo Barone. "Molecular Dynamics Simulations Enforcing Nonperiodic Boundary Conditions: New Developments and Application to the Solvent Shifts of Nitroxide Magnetic Parameters." Journal of Chemical Theory and Computation 18, no. 4 (2022): 2479–93. http://dx.doi.org/10.1021/acs.jctc.2c00046.

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13

Schibli, David J., Raquel F. Epand, Hans J. Vogel, and Richard M. Epand. "Tryptophan-rich antimicrobial peptides: comparative properties and membrane interactions." Biochemistry and Cell Biology 80, no. 5 (2002): 667–77. http://dx.doi.org/10.1139/o02-147.

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The interaction of several tryptophan (Trp)-rich cationic antimicrobial peptides with membranes was investigated. These peptides included tritrpticin, indolicidin, lactoferricin B (Lfcin B), and a shorter fragment of lactoferricin (LfcinB49). The average environment of the Trp residues of these peptides was assessed from their fluorescence properties, both the wavelength of maximal emission as well as the red edge effect. The insertion of the peptides into vesicles of differing composition was examined using quenching of the Trp fluorescence, with both soluble acrylamide and nitroxide-labelle

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14

Chen, Lei, Jonilyn G. Longenecker, Eric W. Moore, and John A. Marohn. "Long-lived frequency shifts observed in a magnetic resonance force microscope experiment following microwave irradiation of a nitroxide spin probe." Applied Physics Letters 102, no. 13 (2013): 132404. http://dx.doi.org/10.1063/1.4795018.

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15

Bales, Barney L., Michelle Meyer, Steve Smith, and Miroslav Peric. "EPR Line Shifts and Line Shape Changes Due to Spin Exchange of Nitroxide-Free Radicals in Liquids 4. Test of a Method to Measure Re-Encounter Rates in Liquids Employing15N and14N Nitroxide Spin Probes." Journal of Physical Chemistry A 112, no. 11 (2008): 2177–81. http://dx.doi.org/10.1021/jp7107494.

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16

Bales, Barney L., Miroslav Peric, and Ileana Dragutan. "Electron Paramagnetic Resonance Line Shifts and Line Shape Changes Due to Spin Exchange between Nitroxide Free Radicals in Liquids. 3. Extension to Five Hyperfine Lines. Additional Line Shifts Due to Re-encounters." Journal of Physical Chemistry A 107, no. 43 (2003): 9086–98. http://dx.doi.org/10.1021/jp030726s.

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17

Shoji, Yoshimi, Yuri Terashima, Kei Ohkubo, et al. "Scandium Ion-Promoted Electron-Transfer Disproportionation of 2-Phenyl-4,4,5,5-tetramethylimidazoline-1-oxyl 3-Oxide (PTIO•) in Acetonitrile and Its Regeneration Induced by Water." International Journal of Molecular Sciences 25, no. 8 (2024): 4417. http://dx.doi.org/10.3390/ijms25084417.

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2-Phenyl-4,4,5,5-tetramethylimidazoline-1-oxyl 3-oxide (PTIO•), a persistent nitronyl nitroxide radical, has been used for the detection and trapping of nitric oxide, as a redox mediator for batteries, for the activity estimation of antioxidants, and so on. However, there is no report on the reactivity of PTIO• in the presence of redox-inactive metal ions. In this study, it is demonstrated that the addition of scandium triflate, Sc(OTf)3 (OTf = OSO2CF3), to an acetonitrile (MeCN) solution of PTIO• resulted in an electron-transfer disproportionation to generate the corresponding cation (PTIO+)

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18

Bales, Barney L., Michelle Meyer, Steve Smith, and Miroslav Peric. "EPR Line Shifts and Line Shape Changes due to Spin Exchange of Nitroxide Free Radicals in Liquids: 6. Separating Line Broadening due to Spin Exchange and Dipolar Interactions." Journal of Physical Chemistry A 113, no. 17 (2009): 4930–40. http://dx.doi.org/10.1021/jp8093947.

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19

Bales, Barney L., and Miroslav Peric. "EPR Line Shifts and Line Shape Changes Due to Spin Exchange of Nitroxide Free Radicals in Liquids 2. Extension to High Spin Exchange Frequencies and Inhomogeneously Broadened Spectra." Journal of Physical Chemistry A 106, no. 19 (2002): 4846–54. http://dx.doi.org/10.1021/jp014518g.

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20

Bales, Barney L., and Miroslav Peric. "EPR Line Shifts and Line Shape Changes Due to Spin Exchange Between Nitroxide Free Radicals in Liquids 10. Spin-Exchange Frequencies of the Order of the Nitrogen Hyperfine Interaction: A Hypothesis." Applied Magnetic Resonance 48, no. 2 (2016): 175–200. http://dx.doi.org/10.1007/s00723-016-0854-9.

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21

Peric, Mirna, Barney L. Bales, and Miroslav Peric. "Electron Paramagnetic Resonance Line Shifts and Line Shape Changes Due to Heisenberg Spin Exchange and Dipole–Dipole Interactions of Nitroxide Free Radicals in Liquids 8. Further Experimental and Theoretical Efforts to Separate the Effects of the Two Interactions." Journal of Physical Chemistry A 116, no. 11 (2012): 2855–66. http://dx.doi.org/10.1021/jp210057x.

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22

Bales, Barney L., Michelle Meyer, and Miroslav Peric. "EPR Line Shifts and Line Shape Changes Due to Heisenberg Spin Exchange and Dipole–Dipole Interactions of Nitroxide Free Radicals in Liquids: 9. An Alternative Method to Separate the Effects of the Two Interactions Employing 15N and 14N." Journal of Physical Chemistry A 118, no. 32 (2014): 6154–62. http://dx.doi.org/10.1021/jp505346g.

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23

Sowiński, Mateusz P., Sahil Gahlawat, Bjarte A. Lund, et al. "Conformational tuning improves the stability of spirocyclic nitroxides with long paramagnetic relaxation times." Communications Chemistry 6, no. 1 (2023). http://dx.doi.org/10.1038/s42004-023-00912-7.

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AbstractNitroxides are widely used as probes and polarization transfer agents in spectroscopy and imaging. These applications require high stability towards reducing biological environments, as well as beneficial relaxation properties. While the latter is provided by spirocyclic groups on the nitroxide scaffold, such systems are not in themselves robust under reducing conditions. In this work, we introduce a strategy for stability enhancement through conformational tuning, where incorporating additional substituents on the nitroxide ring effects a shift towards highly stable closed spirocyclic

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24

Munuera-Javaloy, C., R. Puebla, B. D’Anjou, M. B. Plenio, and J. Casanova. "Detection of molecular transitions with nitrogen-vacancy centers and electron-spin labels." npj Quantum Information 8, no. 1 (2022). http://dx.doi.org/10.1038/s41534-022-00653-w.

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AbstractWe present a protocol that detects molecular conformational changes with two nitroxide electron-spin labels and a nitrogen-vacancy (NV) center in diamond. More specifically, we demonstrate that the NV can detect energy shifts induced by the coupling between electron-spin labels. The protocol relies on the judicious application of microwave and radiofrequency pulses in a range of parameters that ensures stable nitroxide resonances. Furthermore, we demonstrate that our scheme is optimized by using nitroxides with distinct nitrogen isotopes. We develop a simple theoretical model that we c

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25

Chandrasekaran, Siddarth, Connor M. Schneps, Robert Dunleavy, et al. "Tuning flavin environment to detect and control light-induced conformational switching in Drosophila cryptochrome." Communications Biology 4, no. 1 (2021). http://dx.doi.org/10.1038/s42003-021-01766-2.

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AbstractLight-induction of an anionic semiquinone (SQ) flavin radical in Drosophila cryptochrome (dCRY) alters the dCRY conformation to promote binding and degradation of the circadian clock protein Timeless (TIM). Specific peptide ligation with sortase A attaches a nitroxide spin-probe to the dCRY C-terminal tail (CTT) while avoiding deleterious side reactions. Pulse dipolar electron-spin resonance spectroscopy from the CTT nitroxide to the SQ shows that flavin photoreduction shifts the CTT ~1 nm and increases its motion, without causing full displacement from the protein. dCRY engineered to

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26

Peham, Lukas, Gernot M. Wallner, and David Nitsche. "Deterioration of Polypropylene Random Copolymer Formulations Based on Phenolic Antioxidants and Non‐Phenolic Stabilizers at Elevated Temperatures in Hot Air." Journal of Applied Polymer Science, November 21, 2024. http://dx.doi.org/10.1002/app.56509.

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ABSTRACTThis article deals with the hot air aging behavior of polypropylene random copolymers additivated with phenolic antioxidants, hindered amine light stabilizers (HALS) and thiosynergists in a wide temperature range from 65°C to 135°C. Various stabilizer mixtures and their interactions were evaluated. To avoid diffusion‐limited oxidation effects, 100 μm thick specimens were prepared from injection molded sheets and examined by Fourier‐transform infrared spectroscopy in transmission mode and tensile testing. In addition to ultimate strain‐at‐break, the aging indicators phenol index (PI), n

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27

Joseph, Benesh. "Protein‐protein interaction and conformational change in the alpha‐helical membrane transporter BtuCD‐F in the native cellular envelope." ChemBioChem, November 17, 2024. http://dx.doi.org/10.1002/cbic.202400858.

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Alpha‐helical membrane proteins perform numerous critical functions essential for the survival of living organisms. Traditionally, these proteins are extracted from membranes using detergent solubilization and reconstitution into liposomes or nanodiscs. However, these processes often obscure the effects of nanoconfinement and the native environment on the structure and conformational heterogeneity of the target protein. We demonstrate that pulsed dipolar electron spin resonance spectroscopy, combined with the Gd³⁺‐nitroxide spin pair, enables the selective observation of the vitamin B12 import

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28

Sergent, Isaure, Thibault Schutz, Jean‐François Lutz, and Laurence Charles. "Using ion mobility spectrometry to understand signal dilution during tandem mass spectrometry sequencing of digital polymers: Experimental evidence of intramolecular cyclization." Rapid Communications in Mass Spectrometry 38, no. 17 (2024). http://dx.doi.org/10.1002/rcm.9852.

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RationaleOptimizing the structure of digital polymers is an efficient strategy to ensure their tandem mass spectrometry (MS/MS) readability. In block‐truncated poly(phosphodiester)s, homolysis of C–ON bonds in long chains permits the release of smaller blocks amenable to sequencing. Yet the dissociation behavior of diradical blocks was observed to strongly depend on their charge state.MethodsPolymers were ionized in negative mode electrospray and activated in‐source so that blocks released as primary fragments can be investigated using ion mobility spectrometry (IMS) or sequenced in the post‐I

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