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Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...
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Single-Chip Dynamic Nuclear Polarization Microsystem.

Nergiz Sahin Solmaz1, Marco Grisi1, Alessandro V Matheoud1

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Analytical Chemistry
|June 13, 2020
PubMed
Summary
This summary is machine-generated.

Researchers integrated nuclear magnetic resonance (NMR) and electron spin resonance (ESR) electronics onto a single chip. This microsystem enables dynamic nuclear polarization (DNP) enhanced NMR for ultrasmall samples, achieving significant signal improvements.

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Area of Science:

  • Micro- and Spectroscopic Techniques
  • Integrated Circuitry for Scientific Instrumentation

Background:

  • Improving the limit of detection in Nuclear Magnetic Resonance (NMR) and Electron Spin Resonance (ESR) is crucial for analyzing minute sample volumes.
  • Integrating sensitive electronics on a single chip offers a pathway to miniaturization and enhanced sensitivity for NMR and ESR spectroscopy.

Purpose of the Study:

  • To demonstrate the cointegration of front-end NMR and ESR detector electronics on a single silicon chip.
  • To enable dynamic nuclear polarization (DNP) experiments on nanoliter-scale samples using a compact, single-chip microsystem.

Main Methods:

  • Fabrication of a single silicon chip housing concentric planar spiral microcoils for both NMR and ESR excitation/detection.
  • Co-integration of front-end electronics for NMR and ESR detectors within a 2 mm² area.
  • Performance evaluation through 1H DNP-enhanced NMR experiments on 1 nL liquid samples at 10.7 GHz (ESR) / 16 MHz (NMR).

Main Results:

  • Successful cointegration of NMR and ESR front-end electronics on a single chip.
  • Demonstration of 1H DNP-enhanced NMR spectroscopy on 1 nL samples.
  • Achieved NMR enhancements of up to 50-fold for TEMPOL/H2O solutions at room temperature.

Conclusions:

  • The single-chip integrated NMR/ESR microsystem is effective for DNP-enhanced NMR spectroscopy of ultrasmall samples.
  • Advancements in integrated circuit technology can extend this approach to higher frequencies (THz/GHz) for stronger magnetic fields.
  • Potential for creating sensor arrays for parallel DNP-enhanced NMR analysis of nanoliter and subnanoliter samples.