scholarly journals Trapping and Electron Paramagnetic Resonance Characterization of the 5′dAdo• Radical in a Radical S-Adenosyl Methionine Enzyme Reaction with a Non-Native Substrate

2019 ◽  
Vol 5 (11) ◽  
pp. 1777-1785 ◽  
Author(s):  
Richard I. Sayler ◽  
Troy A. Stich ◽  
Sumedh Joshi ◽  
Nicole Cooper ◽  
Jared T. Shaw ◽  
...  
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Enzyme Reaction ◽  
Paramagnetic Resonance ◽  
Adenosyl Methionine ◽  
Electron Paramagnetic

Electron Paramagnetic Resonance as a Probe for Metal Ions and Radicals in Paper

2015 ◽  
Vol 36 (4) ◽  
Author(s):  
Alfonso Zoleo ◽  
Laura Speri ◽  
Maddalena Bronzato
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Metal Ions ◽  
Chemical Species ◽  
Paramagnetic Species ◽  
Paramagnetic Resonance ◽  
Relevant Role ◽  
Historic Paper ◽  
Electron Paramagnetic ◽  
Identification And Characterization

AbstractElectron Paramagnetic Resonance (EPR) is a technique devoted to the identification and characterization of paramagnetic species, i.e. chemical species with unpaired electrons. Very common paramagnetic species which can be detected through EPR in historic paper are Fe(III), Mn(II), Cu(II) ions and radicals, where Fe(III), Cu(II) and radicals play a relevant role in paper degradation. Specifically, Fe(III) is almost ubiquitous in historic paper. Here we propose an overview of the EPR signals in historic and artificially aged paper, and in particular, we would like to show how a deep analysis of EPR signals from paper could provide useful information about the paper’s origin and unique indications of the degradation and oxidation level of the paper.

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