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Related Concept Videos

Applications Of NMR In Biology01:25

Applications Of NMR In Biology

4.7K
Nuclear magnetic resonance (NMR) spectroscopy is a very valuable analytical technique for researchers. It has been used for more than 50 years as an analytical tool. F. Bloch and E. Purcell formulated NMR in 1946 and won the 1952 Nobel Prize in Physics  for their work. Biological macromolecules such as proteins, nucleic acids, lipids, and organic molecules including pharmaceutical compounds, can be studied using this versatile tool that exploits the magnetic properties of certain nuclei.
4.7K
Nuclear Magnetic Resonance (NMR): Overview01:07

Nuclear Magnetic Resonance (NMR): Overview

7.7K
Nuclear magnetic resonance (NMR) is a phenomenon exhibited by certain nuclei that can absorb characteristic radio frequency radiation under certain conditions. NMR has been extensively applied in molecular spectroscopy and medical diagnostic imaging. In both these applications, the molecule or subject under study is placed in a magnetic field and irradiated with radio frequency energy.
NMR spectroscopy generates a spectrum where the characteristic absorption frequencies of the sample are...
7.7K
NMR Spectrometers: Resolution and Error Correction01:14

NMR Spectrometers: Resolution and Error Correction

1.1K
When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...
1.1K
Two-Dimensional (2D) NMR: Overview01:12

Two-Dimensional (2D) NMR: Overview

1.7K
The 1D NMR spectrum of large and complex molecules like natural products has complicated splitting patterns and overlapping signals, which can be easily interpreted using 2-dimensional (2D) NMR. Unlike 1D NMR, 2D NMR has two frequency axes that provide the coupling information between the nucleus A and nucleus B in a molecule. The process from which 2D spectra are obtained has four steps.
The first step is the preparation period, during which nucleus A is excited with a radiofrequency pulse....
1.7K
2D NMR: Overview of Heteronuclear Correlation Techniques01:18

2D NMR: Overview of Heteronuclear Correlation Techniques

872
Heteronuclear correlation spectroscopy is an analytical technique that investigates the coupling between different types of nuclei, often a proton and an X-nucleus, such as carbon-13 or nitrogen-15. This method is commonly used in nuclear magnetic resonance (NMR) spectroscopy to gain insights into complex chemical compounds' structural and compositional aspects. A typical heteronuclear correlation spectrum displays X-nucleus chemical shifts on one axis and a proton spectrum on the other...
872
Other Nuclides: 31P, 19F, 15N NMR01:16

Other Nuclides: 31P, 19F, 15N NMR

861
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...
861

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High-Temperature and High-Pressure In situ Magic Angle Spinning Nuclear Magnetic Resonance Spectroscopy
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Challenges and perspectives in quantitative NMR.

Patrick Giraudeau1,2

  • 1EBSI Team, Chimie et Interdisciplinarité, Synthèse, Analyse, Modélisation (CEISAM), Université de Nantes, CNRS, UMR 6230, LUNAM Université, Nantes, France.

Magnetic Resonance in Chemistry : MRC
|July 3, 2016
PubMed
Summary
This summary is machine-generated.

Quantitative NMR (nuclear magnetic resonance) faces challenges in resolution and sensitivity. Advanced techniques like hyperpolarization and multi-dimensional NMR offer improved analytical performance for complex samples.

Keywords:
13C1HNMRfast 2D NMRhyperpolarizationperspectivesquantitative analysissmall molecules

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Nuclear Magnetic Resonance (NMR)

Background:

  • Quantitative NMR (qNMR) is a powerful analytical technique.
  • Current limitations exist in resolution and sensitivity for complex samples.
  • Analytical chemistry principles of trueness and precision are crucial for qNMR.

Purpose of the Study:

  • To review major challenges and future perspectives in quantitative NMR as of early 2016.
  • To discuss recent advancements enhancing resolution and sensitivity in qNMR.
  • To explore potential applications of improved qNMR methodologies.

Main Methods:

  • Summary of key concepts in quantitative NMR.
  • Discussion of recent evolutions in NMR resolution and sensitivity.
  • Focus on advanced techniques: multi-dimensional qNMR and hyperpolarization (e.g., para-hydrogen-induced polarization, dynamic nuclear polarization).

Main Results:

  • Methodological developments aim to boost qNMR resolution and sensitivity.
  • These advancements are evaluated based on analytical performance (trueness and precision).
  • Potential for qNMR in challenging applications with complex matrices and low analyte concentrations.

Conclusions:

  • Significant progress in qNMR is driven by enhanced resolution and sensitivity.
  • Hyperpolarization and multi-dimensional techniques are key future research directions.
  • Improved qNMR methods will expand its applicability in demanding analytical scenarios.