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Recently, Dr. Mao Wenping, a researcher at the Strong Magnetic Field Scientific Research Center of the Chinese Academy of Sciences' Hefei Institute of Physical Science, developed a 600MHz solid double-resonant static probe.
Solid-state nuclear magnetic resonance (NMR) can determine in situ the molecular structure and kinetic information with atomic resolution, and has important applications in material characterization, heterogeneous catalysis, and structural biology. The strong magnetic field helps to increase the NMR detection sensitivity and spectral resolution, but it also poses new challenges for the probe design: the wavelength effect causes the uniformity of the radio frequency field (B1 field) to decrease, and the relative strength of the radio frequency electric field is too strong, leading to the strength of the B1 field. Limited, salt-containing biological samples interact with strong electric fields and cause severe fever or even loss of activity. Therefore, the development of low gyromagnetic ratio quadrupole nucleus and biological macromolecule solid state NMR under high field requires a high uniformity and intensity B1 field and low electric field probe to increase the sensitivity of NMR detection and shorten the acquisition time of the spectrum data. .
Mao Wenping through the introduction of crossover coils, balance circuits and impedance matching network optimization technology, so that the dual resonance static probe obtained the following main performance parameters: 1H channel B1 field uniformity A810/A90 is about 96%, the maximum de even field strength is 132 kHz * 80 ms, pulsed power loss of salt sample is 0.02 mW· kHz-2 · mM-1 (only 10% of the solenoid coil probe, so it is beneficial to reduce the heating effect of salt samples, the test sample is 0 ~1000 mM NaCl solution); X channel can cover all Larmor resonance frequencies of 31P and below, A810/A90 in B1 field is approximately 83%, and the cumulative sensitivity of adamantanes in static CP experiment is 88 (4 mm double resonance in a commercial condition under the same conditions The MAS probe has a sensitivity of 46).
The probe will be included in the Regional Center for Large Instruments in Hefei Strategic Energy and Material Science to be open to users.
The above research was funded by the National Natural Science Foundation of China.
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