期刊
SOLID STATE NUCLEAR MAGNETIC RESONANCE
卷 100, 期 -, 页码 70-76出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ssnmr.2019.03.004
关键词
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资金
- Agence Nationale de la Recherche (project membrane DNP) [12-BSV5-0012]
- Agence Nationale de la Recherche (project MemPepSyn) [14-CE34-0001-01]
- Agence Nationale de la Recherche (project In Membrane) [15-CE11-0017-01]
- Agence Nationale de la Recherche (project Biosupramol) [17-CE18-0033-3]
- Agence Nationale de la Recherche (project LabEx Chemistry of Complex Systems) [10-LABX-0026_CSC]
- University of Strasbourg
- CNRS
- Region Alsace
- RTRA International Center of Frontier Research in Chemistry
Whereas specially designed dinitroxide biradicals, reconstitution protocols, oriented sample geometries and NMR probes have helped to much increase the DNP enhancement factors of membrane samples they still lag considerably behind those obtained from glasses made of protein solutions. Here we show that not only the MAS rotor material but also the distribution of the membrane samples within the NMR rotor have a pronounced effect on the DNP enhancement. These observations are rationalized with the cooling efficiency and the internal properties of the sample, monitored by their T-1 relaxation, microwave ON versus OFF signal intensities and DNP effect. The data are suggestive that for membranes the speed of cooling has a pronounced effect on the membrane properties and concomitantly the distribution of biradicals within the sample.
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