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Spontaneous enhancement of magnetic resonance signals using a RASER

MPS-Authors
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Korchak,  S.
Research Group of NMR Signal Enhancement, MPI for Biophysical Chemistry, Max Planck Society;

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Kaltschnee,  L.
Research Group of NMR Signal Enhancement, MPI for Biophysical Chemistry, Max Planck Society;

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Dervisoglu,  R.
Research Group of Solid State NMR Spectroscopy-2, MPI for Biophysical Chemistry, Max Planck Society;

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Andreas,  L. B.
Research Group of Solid State NMR Spectroscopy-2, MPI for Biophysical Chemistry, Max Planck Society;

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Griesinger,  C.
Department of NMR Based Structural Biology, MPI for biophysical chemistry, Max Planck Society;

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Glöggler,  S.
Research Group of NMR Signal Enhancement, MPI for Biophysical Chemistry, Max Planck Society;

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Citation

Korchak, S., Kaltschnee, L., Dervisoglu, R., Andreas, L. B., Griesinger, C., & Glöggler, S. (2021). Spontaneous enhancement of magnetic resonance signals using a RASER. Angewandte Chemie International Edition, 60(38), 20984-20990. doi:10.1002/ange.202108306.


Cite as: https://hdl.handle.net/21.11116/0000-0009-833F-D
Abstract
Nuclear magnetic resonance is usually drastically limited by its intrinsically low sensitivity: Only a few spins contribute to the overall signal. To overcome this limitation, hyperpolarization methods were developed that increase signals several times beyond the normal/thermally polarized signals. The ideal case would be a universal approach that can signal enhance the complete sample of interest in solution to increase detection sensitivity. Here, we introduce a combination of para-hydrogen enhanced magnetic resonance with the phenomenon of the RASER: Large signals of para-hydrogen enhanced molecules interact with the magnetic resonance coil in a way that the signal is spontaneously converted into an in-phase signal. These molecules directly interact with other compounds via dipolar couplings and enhance their signal. We demonstrate that this is not only possible for solvent molecules but also for an amino acid.