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  Evaluation of a shuttle DNP spectrometer by calculating the coupling and global enhancement factors of l-tryptophan.

Lottmann, P., Marquardsen, T., Krahn, A., Tavernier, A., Höfer, P., Bennati, M., et al. (2012). Evaluation of a shuttle DNP spectrometer by calculating the coupling and global enhancement factors of l-tryptophan. Applied Magnetic Resonance, 43(1-2), 207-221. doi:10.1007/s00723-012-0345-6.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-000F-A5DB-0 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0027-CAFB-6
Genre: Journal Article

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1481338.pdf (Publisher version), 575KB
 
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 Creators:
Lottmann, P.1, Author              
Marquardsen, T., Author
Krahn, A., Author
Tavernier, A., Author
Höfer, P., Author
Bennati, M.2, Author              
Engelke, F., Author
Griesinger, C.1, Author              
Affiliations:
1Department of NMR Based Structural Biology, MPI for biophysical chemistry, Max Planck Society, ou_578567              
2Research Group of Electron Paramagnetic Resonance, MPI for biophysical chemistry, Max Planck Society, ou_578606              

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 Abstract: A liquid state shuttle dynamic nuclear polarization (DNP) spectrometer is presented, featuring several technical modifications that increase stability and improve reproducibility. For the protons of l-tryptophan, the signal enhancement and the DNP spin properties, such as relaxation, were measured and compared with each other. The calculated coupling factors suggest that the proton accessibility for the polarizer molecule has an important influence on the DNP enhancement. In general, short proton spin longitudinal relaxation times without radical reduce the detectable enhancement by decreasing the leakage factor and increasing the relaxation losses during the course of the sample transfer. The usage of a global enhancement factor gives a more complete overview of the capabilities for the described experimental setup. Global enhancements of up to −4.2 for l-tryptophan protons are found compared to pure Boltzmann enhancements of up to −2.4.

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Language(s): eng - English
 Dates: 2012-05-302012
 Publication Status: Published in print
 Pages: 15
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 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1007/s00723-012-0345-6
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Title: Applied Magnetic Resonance
Source Genre: Journal
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Pages: - Volume / Issue: 43 (1-2) Sequence Number: - Start / End Page: 207 - 221 Identifier: -