Related Experiment Video
Updated: Jun 14, 2025
10:54
Dissolution Dynamic Nuclear Polarization Instrumentation for Real-time Enzymatic Reaction Rate Measurements by NMR
Published on: February 23, 2016
10.6K
Recent developments in materials and applications of triplet dynamic nuclear polarization
Tomoyuki Hamachi1, Nobuhiro Yanai2
1Department of Applied Chemistry, Graduate School of Engineering, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan.
Progress in Nuclear Magnetic Resonance Spectroscopy
|September 5, 2024
Summary
Dynamic nuclear polarization (DNP) enhances NMR/MRI sensitivity. Triplet-DNP offers room-temperature hyperpolarization, with recent advances in materials and instrumentation expanding its applications.
Area of Science:
- Nuclear Magnetic Resonance (NMR) and Magnetic Resonance Imaging (MRI)
- Quantum Chemistry and Spectroscopy
- Materials Science and Engineering
Background:
- Dynamic nuclear polarization (DNP) significantly boosts NMR/MRI sensitivity by transferring electron spin polarization to nuclei via microwave irradiation.
- Triplet-DNP utilizes photoexcited triplet electron spins for hyperpolarization, enabling high sensitivity at room temperature and low magnetic fields.
- This technique offers a promising avenue for overcoming sensitivity limitations in various spectroscopic and imaging applications.
Purpose of the Study:
- To review recent advancements in materials and instrumentation for triplet-DNP.
- To provide a historical context and explain the fundamental principles of triplet-DNP.
- To discuss future directions for broadening the applicability of triplet-DNP.
Main Methods:
- Review of recent literature on triplet-DNP materials and instrumentation.
- Explanation of the principles behind spin polarization transfer from triplet electron spins to nuclei.
- Discussion of dissolution triplet-DNP for high-sensitivity solution NMR.
Main Results:
- Highlighting new materials for hyperpolarizing water and biomolecules.
- Showcasing advancements in dissolution triplet-DNP for enhanced solution-state NMR sensitivity.
- Identifying strategies for further improving polarization efficiency.
Conclusions:
- Triplet-DNP has seen significant progress in materials and instrumentation, enabling room-temperature, low-field hyperpolarization.
- Recent developments facilitate the hyperpolarization of crucial biological molecules and water, expanding potential applications.
- Future research directions aim to further enhance polarization efficiency and broaden the scope of triplet-DNP applications in science and medicine.
Related Concept Videos
01:15Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)
274
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...
274
01:12Double Resonance Techniques: Overview
191
Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
Spin decoupling is usually achieved by...
191
01:20¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)
1.0K
When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
1.0K
01:07Nuclear Overhauser Enhancement (NOE)
645
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...
645
01:16Other Nuclides: 31P, 19F, 15N NMR
372
Many organic, inorganic, and biological molecules contain spin-half nuclei such as nitrogen-15, fluorine-19, and phosphorus-31. As a result, NMR studies of these nuclei have found extensive applications in chemical and biological research.
While fluorine-19 and phosphorous-31 have high natural abundances (100%) and positive gyromagnetic ratios, nitrogen-15 has a low natural abundance and a negative gyromagnetic ratio. However, nitrogen-15 is still preferred over nitrogen-14 (which has a...
While fluorine-19 and phosphorous-31 have high natural abundances (100%) and positive gyromagnetic ratios, nitrogen-15 has a low natural abundance and a negative gyromagnetic ratio. However, nitrogen-15 is still preferred over nitrogen-14 (which has a...
372
01:23Atomic Nuclei: Nuclear Relaxation Processes
632
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.
632