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Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)01:15

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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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Irradiation of a spin-active nucleus causes an increase or decrease in the signal intensity of neighboring nuclei that are not necessarily chemically bonded or involved in J-coupling.  This phenomenon, called the Nuclear Overhauser Enhancement (NOE), results from through-space interactions between the nuclear spins. The NOE effect decreases with increasing internuclear distance and is generally not observed beyond 4 angstroms. In NOE, dipole-dipole interactions between neighboring...
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Related Experiment Video

Updated: Sep 10, 2025

Dissolution Dynamic Nuclear Polarization Instrumentation for Real-time Enzymatic Reaction Rate Measurements by NMR
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Nanoparticle-assisted dynamic nuclear polarization in liquids.

Beatrice Bernadette Mascitti1, Giordano Zanoni1, Alex van der Ham2

  • 1Department of Chemical Sciences, University of Padova, Padova, Italy. federico.rastrelli@unipd.it.

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Summary

Gold nanoparticles functionalized with specific molecules show potential for enhancing nuclear magnetic resonance (NMR) signals. This study explores using electron-nucleus interactions for dynamic nuclear polarization (DNP) in NMR chemosensing applications.

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Area of Science:

  • Nanotechnology
  • Chemical Physics
  • Analytical Chemistry

Background:

  • Gold nanoparticles (AuNPs) with self-assembled monolayers are useful in catalysis and sensing.
  • AuNPs can serve as magnetization reservoirs for selective NMR signal transfer.
  • Existing NMR chemosensing relies on nucleus-nucleus interactions.

Purpose of the Study:

  • To investigate electron-nucleus interactions for enhanced Overhauser effect dynamic nuclear polarization (OE-DNP).
  • To design AuNPs for selective molecular recognition and polarization transfer.
  • To assess the feasibility of AuNPs as polarizing agents in NMR.

Main Methods:

  • Functionalizing AuNPs with a radical-bearing thiol and a recognition-tailored thiol.
  • Performing OE-DNP experiments on a chloroform and methanol mixture.
  • Evaluating polarization transfer efficiency and selectivity.

Main Results:

  • Significant signal enhancements observed for chloroform, potentially limited by radical mobility.
  • Methanol affinity did not correlate with enhanced signals.
  • AuNPs demonstrated effectiveness as polarizing agents up to 9.4 T magnetic fields.

Conclusions:

  • AuNPs can act as polarizing agents for OE-DNP at high magnetic fields.
  • Future monolayer modifications could combine polarization efficiency with molecular recognition.
  • This approach offers a novel strategy for hyperpolarization and NMR detection.