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Protons and neutrons, collectively called nucleons, are packed together tightly in a nucleus. With a radius of about 10−15 meters, a nucleus is quite small compared to the radius of the entire atom, which is about 10−10 meters. Nuclei are extremely dense compared to bulk matter, averaging 1.8 × 1014 grams per cubic centimeter. If the earth’s density were equal to the average nuclear density, the earth’s radius would be only about 200 meters.
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In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
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Nuclear Overhauser Enhancement (NOE)01:07

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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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Atomic Nuclei: Types of Nuclear Relaxation01:28

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Nuclear relaxation restores the equilibrium population imbalance and can occur via spin–lattice or spin–spin mechanisms, which are first-order exponential decay processes.
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Theories of Dissolution: Diffusion Layer Model01:15

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Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
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Dissolution Dynamic Nuclear Polarization Instrumentation for Real-time Enzymatic Reaction Rate Measurements by NMR
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Practical dissolution dynamic nuclear polarization.

Stuart J Elliott1, Quentin Stern1, Morgan Ceillier1

  • 1Centre de Résonance Magnétique Nucléaire à Très Hauts Champs - UMR 5082 Université de Lyon, CNRS, Université Claude Bernard Lyon 1, ENS de Lyon, 5 Rue de la Doua, 69100 Villeurbanne, France.

Progress in Nuclear Magnetic Resonance Spectroscopy
|December 2, 2021
PubMed
Summary
This summary is machine-generated.

This practical handbook offers guidance for dissolution-dynamic nuclear polarization (DNP) experiments. It provides tips for sample preparation, maintenance, and accurate polarization quantification to help researchers overcome common laboratory challenges.

Keywords:
CPDNPHyperpolarizationNMRPolarization quantificationSPY-NMRSample preparationSystems maintenanceTransport dynamicsdDNP

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Area of Science:

  • Nuclear Magnetic Resonance Spectroscopy
  • Chemical Physics
  • Analytical Chemistry

Background:

  • Dissolution-dynamic nuclear polarization (DNP) is a powerful technique for enhancing NMR signal sensitivity.
  • Existing reviews cover instrumentation, theory, and general experimentation.
  • Practical, laboratory-focused guidance for dissolution-DNP is needed to facilitate wider adoption and troubleshooting.

Purpose of the Study:

  • To serve as a practical handbook for researchers performing dissolution-DNP experiments.
  • To provide actionable advice for overcoming common challenges in dissolution-DNP.
  • To improve the efficiency, reliability, and accuracy of dissolution-DNP experiments in diverse laboratory settings.

Main Methods:

  • Detailed guidance on sample preparation and assessing sample health.
  • A systematic checklist for diagnosing system faults and performing routine maintenance.
  • Explanation of mechanical requirements specific to sample dissolution in DNP.
  • Methods for accurate, rapid, and dependable polarization quantification.

Main Results:

  • Identification of key challenges at each stage of a dissolution-DNP experiment.
  • Provision of practical solutions for common limitations encountered in laboratory practice.
  • Enhanced understanding of sample preparation, system maintenance, and polarization measurement.

Conclusions:

  • This review offers essential practical advice for implementing and optimizing dissolution-DNP.
  • Researchers can utilize this handbook to improve experimental success and data quality.
  • The focus on overcoming limitations aims to make dissolution-DNP more accessible and robust.