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Related Concept Videos

¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

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The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
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¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR01:15

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The axial and equatorial protons in cyclohexane can be distinguished by performing a variable-temperature NMR experiment. In this process, except for one proton, the remaining eleven protons are replaced by deuterium. The deuterium substitution avoids the possible peak splitting caused by the spin-spin coupling between the adjacent protons. The remaining proton flips between the axial and equatorial positions.
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Applications Of NMR In Biology01:25

Applications Of NMR In Biology

4.5K
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.
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¹H NMR: Pople Notation01:09

¹H NMR: Pople Notation

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The Pople nomenclature system classifies spin systems based on the difference between their chemical shifts. Coupled spins are denoted by capital letters with subscripts indicating the number of equivalent nuclei. When the coupled nuclei have well-separated chemical shifts, they are assigned letters that are far apart in the alphabet, such as A and X. When the difference in chemical shifts is small, coupled nuclei are named using adjacent letters of the alphabet (AB, MN, or XY).
A proton...
2.6K
NMR Spectrometers: Overview01:20

NMR Spectrometers: Overview

2.2K
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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¹H NMR: Complex Splitting01:13

¹H NMR: Complex Splitting

1.9K
A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied...
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High-Throughput Metabolomics by 1D NMR.

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Metabolomics, the study of metabolites, requires strong chemical expertise for accurate analysis. Nuclear Magnetic Resonance (NMR) offers a unique holistic view, potentially enabling future population-wide health screening.

Keywords:
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Area of Science:

  • Chemistry
  • Metabolomics
  • Analytical Chemistry

Background:

  • Metabolomics studies the complete set of metabolites (metabolome), linking biology, physiology, pathology, and medicine.
  • Metabolites are chemical entities susceptible to degradation, unlike DNA, necessitating careful handling and analysis.
  • Effective metabolomics requires chemical expertise in sample preparation, analytical procedures, chemometrics, and statistical tools.

Purpose of the Study:

  • To explore metabolomics from a chemical perspective, focusing on Nuclear Magnetic Resonance (NMR) techniques.
  • To highlight the chemical challenges and requirements for accurate metabolite identification and quantification.
  • To discuss the potential of NMR in metabolomics for future applications.

Main Methods:

  • Focus on Nuclear Magnetic Resonance (NMR) as a primary metabolomic technique.
  • Emphasis on chemical principles for sample preparation and storage.
  • Application of chemometrics and advanced statistical tools for data analysis.

Main Results:

  • NMR provides a unique holistic perspective in metabolomic analysis.
  • Chemical skills are crucial for overcoming metabolite instability and ensuring accurate quantification.
  • NMR presents advantages and disadvantages in analytical performance.

Conclusions:

  • Metabolomics relies heavily on fundamental chemical principles and skills.
  • NMR spectroscopy offers a promising approach for metabolomic studies.
  • The holistic nature of NMR may support its use in population-wide health screening.