Spin-trapped hydroxyl free radicals studied at low field by Field-Cycled Dynamic Nuclear Polarization |
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Authors: | Dr. David J. Lurie I. Nicholson J. S. McLay J. R. Mallard |
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Affiliation: | 1. Department of Bio-Medical Physics and Bio-Engineering, University of Aberdeen, Foresterhill, Aberdeen, AB9 2ZD, UK 2. Department of Medicine and Therapeutics, University of Aberdeen, UK
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Abstract: | The technique of Field-Cycled Dynamic Nuclear Polarization (FC-DNP) involves the EPR irradiation of a free radical solution and the subsequent observation of the NMR signal, the experiment being carried out at a range of magnetic field strengths in order to measure the free radical’s EPR spectrum. In this work FC-DNP has been used to study the EPR spectrum of DMPO spin-trapped hydroxyl free radicals at magnetic field strengths between 0.5 mT and 13.0 mT (5–130 Gauss). The low-field EPR spectrum contains six separate EPR lines, in contrast to the well-known X-band spectrum where only four are seen. Knowledge of the spin-adduct’s EPR spectrum will be of use to workers involved in low-field EPR, especially those conducting biological or in-vivo spin-trapping experiments. |
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