scholarly journals The Electronic Structure of the Cys-Tyr•Free Radical in Galactose Oxidase Determined by EPR Spectroscopy†

Biochemistry ◽  
2008 ◽  
Vol 47 (25) ◽  
pp. 6637-6649 ◽  
Author(s):  
Yuk-Ki Lee ◽  
Mei M. Whittaker ◽  
James W. Whittaker
Keyword(s):  
Electronic Structure ◽  
Free Radical ◽  
Epr Spectroscopy ◽  
Galactose Oxidase

scholarly journals Structure and mechanism of galactose oxidase. The free radical site.

1994 ◽  
Vol 269 (40) ◽  
pp. 25095-25105
Author(s):  
A.J. Baron ◽  
C. Stevens ◽  
C. Wilmot ◽  
K.D. Seneviratne ◽  
V. Blakeley ◽  
...  
Keyword(s):  
Free Radical ◽  
Galactose Oxidase ◽  
Radical Site

EPR Spectroscopy Elucidates the Electronic Structure of [FeV(O)(TAML)] Complexes

2021 ◽  
Author(s):  
Yujeong Kim ◽  
Jin Kim ◽  
Linh. K. Nguyen ◽  
Yong-Min Lee ◽  
Wonwoo Nam ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Epr Spectroscopy ◽  
Macrocyclic Ligands ◽  
Spin Hamiltonian ◽  
Pulse Epr ◽  
Hamiltonian Parameters

Multifrequency, multitechnique pulse EPR spectroscopy was employed to unravel the spin Hamiltonian parameters of 17O in the [FeV=O] moiety with two different tetraamido macrocyclic ligands (TAMLs), [FeV(O)(TAML-1)]– (1, H4(TAML-1) =...

Investigation of Antioxidant Activity of Pomegranate Juices by Means of Electron Paramagnetic Resonance and UV-Vis Spectroscopy

2015 ◽  
Vol 98 (4) ◽  
pp. 866-870 ◽  
Author(s):  
Violetta Kozik ◽  
Krystyna Jarzembek ◽  
Agnieszka Jędrzejowska ◽  
Andrzej Bąk ◽  
Justyna Polak ◽  
...  
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Free Radical ◽  
Epr Spectroscopy ◽  
Antioxidant Properties ◽  
Free Radical Scavenger ◽  
Pomegranate Juice ◽  
Radical Scavenger ◽  
Paramagnetic Resonance ◽  
Vis Spectroscopy ◽  
Electron Paramagnetic

Abstract Pomegranate fruit (Punica granatum L.) is a source of numerous phenolic compounds, and it contains flavonoids such as anthocyanins, anthocyanidins, cyanidins, catechins and other complexes of flavonoids, ellagitannins, and hydrolyzed tannins. Pomegranate juice shows antioxidant, antiproliferative, and anti-atherosclerotic properties. The antioxidant capacity (TEAC) of the pomegranate juices was measured using electron paramagnetic resonance (EPR) spectroscopy and 1,1-diphenyl-2-picrylhydrazyl (DPPH•) as a source of free radicals, and the total phenolic (TP) content was measured using UV-Vis spectroscopy. All the examined pomegranate juices exhibited relatively high antioxidant properties. The TEAC values determined by means of EPR spectroscopy using Trolox (TE) as a free radical scavenger were in the range of 463.12 to 1911.91 μmol TE/100 mL juice. The TP content measured by the Folin-Ciocalteu method, using gallic acid (GA) as a free radical scavenger, widely varied in the investigated pomegranate juice samples and ranged from 1673.62 to 5263.87 mg GA/1 L juice. The strongest antioxidant properties were observed with the fresh pomegranate juices obtained from the fruits originating from Israel, Lebanon, and Azerbaijan. Correlation analysis of numerical data obtained by means of EPR spectroscopy (TEAC) and UV-Vis spectroscopy (TP) gave correlation coefficient (r) = 0.90 and determination coefficient (r2) = 0.81 (P <0.05).

scholarly journals EPR Spectroscopy Study of the Radical Cation Cluster (η⁵-C₅H₅)(CO)₅ReFePt(μ₃-C=CHPh)(η²-Ph₂P(CH₂)₂PPh₂)

2019 ◽  
pp. 573-579
Author(s):  
Nikolay G. Maksimov ◽  
Victor V. Verpekin ◽  
Dmitry V. Zimonin ◽  
Galina V. Burmakina ◽  
Oleg S. Chudin ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Low Temperature ◽  
Radical Cation ◽  
Unpaired Electron ◽  
Iron Atom ◽  
Epr Spectroscopy ◽  
Binuclear Complex ◽  
Chemical Oxidation ◽  
Spectroscopy Study ◽  
Model Spectrum

The chemical oxidation of the cluster CpReFePt(μ3-C=CHPh)(CO)5(dppe) (Cp = η5-C5H5, dppe = η2- Ph2P(CH2)2PPh2) resulted in a radical cation [CpReFePt(μ3-C=CHPh)(CO)5(dppe)]+• that is sufficiently stable only at low temperature. An electronic structure of the radical cation was studied by EPR and following parameters were obtained by comparison of the experimental and model spectrum: gx = 2.070 gy = 2.0295 gz = 1.997; Ax(31P) = 17 Ay(31P) = 49 Az(31P) = 35 (Gs);Ax(195Pt) = 62 Ay(195Pt) = 45 Az(195Pt) = 105 (Gs). An unpaired electron is seen to be mainly concentrated on the iron atom (85-90%) and partially on the platinum atom (10-15%). Further transformation of the radical cation led to the formation of the binuclear complex Cp(CO)2RePt(μ-C=CHPh)(dppe) and the Fe-carbonyl fragment

Characterization of the electronic structure of defect in quartz by pulsed EPR spectroscopy

2012 ◽  
Vol 376 (32) ◽  
pp. 2195-2199 ◽  
Author(s):  
Pengbo Feng ◽  
Ya Wang ◽  
Xing Rong ◽  
Ji-Hu Su ◽  
Chenyong Ju ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Epr Spectroscopy ◽  
Pulsed Epr

A study of HeI photoelectron spectroscopy on the electronic structure of the nitrate free radical NO3

1997 ◽  
Vol 106 (8) ◽  
pp. 3003-3006 ◽  
Author(s):  
Dianxun Wang ◽  
Peng Jiang ◽  
Ximei Qian ◽  
Gongyi Hong
Keyword(s):  
Electronic Structure ◽  
Free Radical ◽  
Photoelectron Spectroscopy

Control over Fe3+ speciation in colloidal ZnO nanocrystals

2015 ◽  
Vol 3 (17) ◽  
pp. 4352-4358 ◽  
Author(s):  
Dongming Zhou ◽  
Kevin R. Kittilstved
Keyword(s):  
Electronic Structure ◽  
Epr Spectroscopy ◽  
Ground State ◽  
Zno Nanocrystals ◽  
Nanocrystal Growth

The ground state electronic structure of Fe3+ dopants in colloidal ZnO nanocrystals is studied by EPR spectroscopy and reveals multiple Fe3+ coordination environments during nanocrystal growth.

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