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Related Concept Videos

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

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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...
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Chemical Shift: Internal References and Solvent Effects01:17

Chemical Shift: Internal References and Solvent Effects

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In an NMR sample, precise measurement of the absolute absorption frequencies of nuclei is difficult. A standard internal reference compound is added, and the frequency difference between the reference signal and sample signals is measured.
The internal reference compound generally used in NMR spectroscopy is tetramethylsilane (TMS). TMS is preferred because it is chemically inert, soluble in NMR solvents, and easily removable. Also, the highly shielded methyl protons in TMS yield an intense...
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Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)01:15

Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)

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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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¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

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Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
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2D NMR: Overview of Homonuclear Correlation Techniques01:16

2D NMR: Overview of Homonuclear Correlation Techniques

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Homonuclear correlation spectroscopy (COSY) is a powerful technique used in Nuclear Magnetic Resonance (NMR) spectroscopy to study the correlations between nuclei of the same type within a molecule. It provides information about scalar couplings between adjacent nuclei, which helps determine connectivity and structural information. There are several COSY variants, each with its unique strengths and experimental parameters.
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NMR Spectrometers: Overview01:20

NMR Spectrometers: Overview

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NMR spectrometers consist of a strong magnet, a radiofrequency transmitter, and a detector attached to a computer console for recording spectra of samples containing NMR-active nuclei. In first-generation NMR instruments called continuous-wave spectrometers, the resonance frequencies of the nuclei are determined by frequency-sweep or field-sweep methods. The magnetic field strength is fixed and the rf signal is swept in the former, while the radiofrequency signal is fixed and the magnetic field...
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Related Experiment Video

Updated: Sep 24, 2025

Dissolution Dynamic Nuclear Polarization Instrumentation for Real-time Enzymatic Reaction Rate Measurements by NMR
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Interfacing Liquid State Hyperpolarization Methods with NMR Instrumentation.

Pierce Pham1, Ratnamala Mandal1, Chang Qi1

  • 1Department of Chemistry, Texas A&M University, 3255 TAMU, College Station, TX 77843, USA.

Journal of Magnetic Resonance Open
|May 9, 2022
PubMed
Summary
This summary is machine-generated.

New hyperpolarization techniques enhance nuclear magnetic resonance (NMR) spectroscopy. Rapid injection methods enable high-resolution analysis of molecules at low concentrations or with high time resolution.

Keywords:
Dissolution dynamic nuclear polarizationHyperpolarizationPara-hydrogen inducedPolarization

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Area of Science:

  • Nuclear Magnetic Resonance Spectroscopy
  • Hyperpolarization Physics

Background:

  • Liquid state hyperpolarization methods significantly boost NMR signal intensity.
  • This enhancement allows NMR spectroscopy at low concentrations or with high time resolution.

Purpose of the Study:

  • To highlight rapid injection techniques for high-resolution NMR spectroscopy using hyperpolarization.
  • To showcase the integration of dissolution dynamic nuclear polarization (D-DNP) and para-hydrogen induced polarization (PHIP) with NMR.

Main Methods:

  • Utilizing dissolution dynamic nuclear polarization (D-DNP) and para-hydrogen induced polarization (PHIP) for hyperpolarization.
  • Employing rapid gas and liquid driven sample injection techniques.
  • Adapting NMR experiments for single or few-scan acquisitions.

Main Results:

  • Successful combination of rapid injection with D-DNP and PHIP hyperpolarization.
  • Expanded applicability of hyperpolarized NMR to spins with short relaxation times.
  • Enabled real-time reaction monitoring through mixing experiments.

Conclusions:

  • Rapid injection techniques are crucial for interfacing hyperpolarization with liquid state NMR.
  • These methods enhance control over sample conditions and expand NMR applications.
  • Real-time reaction studies are facilitated by the developed techniques.