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A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
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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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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.
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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...
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Determination of Sample Concentrations by PULCON NMR Spectroscopy.

Jeffrey Y W Mak1

  • 1Division of Chemistry and Structural Biology, Institute for Molecular Bioscience, The University of Queensland, Brisbane, QLD, 4072, Australia.

Australian Journal of Chemistry
|April 7, 2022
PubMed
Summary

Pulse Length Based Concentration Determination (PULCON) offers accurate, non-invasive solution concentration measurements in NMR spectroscopy. This method bypasses weighing errors and is ideal for sensitive or difficult-to-handle compounds.

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Area of Science:

  • Analytical Chemistry
  • Biochemistry
  • Organic Chemistry

Background:

  • Accurate quantification of solutes is crucial in various chemical and biological applications.
  • Traditional weighing methods for sample preparation can be prone to errors from contaminants like moisture.
  • Certain molecules, such as small molecules, peptides, and unstable compounds, are challenging to quantify accurately by weight.

Purpose of the Study:

  • To introduce Pulse Length Based Concentration Determination (PULCON) as a novel technique for measuring solution concentrations.
  • To highlight the advantages of PULCON over traditional methods in NMR spectroscopy.
  • To demonstrate the versatility and diverse applications of PULCON for biological and medicinal chemists.

Main Methods:

  • PULCON utilizes the unique resonances of solutes for direct quantification.
  • The technique involves non-invasive measurement during routine NMR spectroscopy.
  • It measures solution concentrations based on pulse length parameters.

Main Results:

  • PULCON provides accurate and versatile concentration measurements.
  • The method eliminates weight-based errors associated with contaminants.
  • It enables direct use of NMR samples in biological assays.
  • PULCON is particularly effective for quantifying small, unstable, or difficult-to-handle molecules.

Conclusions:

  • PULCON is a powerful, non-invasive, and accurate NMR technique for concentration determination.
  • It offers significant advantages for quantifying challenging samples and integrating with biological assays.
  • This method provides a valuable tool for biological and medicinal chemists in routine NMR analysis.