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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.
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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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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).
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Operation of a Benchtop Bioreactor
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Low-field and benchtop NMR.

Bernhard Blümich1

  • 1Institut für Technische und Makromolekulare Chemie, RWTH Aachen University, Aachen, Germany.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|July 18, 2019
PubMed
Summary
This summary is machine-generated.

Nuclear Magnetic Resonance (NMR) technology has evolved from large, low-field instruments to compact, tabletop devices. Modern advancements enable ultra-low field NMR for diverse chemical analysis applications.

Keywords:
Benchtop spectroscopyLow-field NMRMobile NMRRelaxometrySpectroscopyZULF

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Area of Science:

  • Chemistry
  • Physics
  • Materials Science

Background:

  • Nuclear Magnetic Resonance (NMR) spectroscopy originated at low magnetic field strengths.
  • Key discoveries including spin echo and Fourier NMR spectroscopy were made at these early low fields.
  • NMR instruments have significantly decreased in size, from laboratory floor models to tabletop spectrometers.

Purpose of the Study:

  • To trace the historical development and miniaturization of NMR instruments.
  • To highlight the evolution of NMR applications from specialized research to routine analysis.
  • To discuss the enabling factors and future directions for ultra-low field NMR.

Main Methods:

  • Historical review of NMR instrumentation and applications.
  • Analysis of technological advancements in electronics and detection schemes.
  • Exploration of hyperpolarization techniques and their impact on sensitivity.

Main Results:

  • Significant NMR discoveries occurred at low field strengths, which are now considered low today.
  • Tabletop NMR spectrometers now offer a comprehensive range of analytical capabilities.
  • Ultra-low field NMR is becoming feasible due to improved sensitivity and novel detection methods.

Conclusions:

  • NMR technology has undergone substantial miniaturization and increased accessibility.
  • Ultra-low field NMR, driven by sensitivity enhancements and new techniques, is a promising area.
  • Future developments focus on cost reduction, further miniaturization, and user-friendly NMR applications.