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Related Concept Videos

NMR Spectroscopy and Mass Spectrometry of Aldehydes and Ketones01:15

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In aldehydes, the hydrogen atom connected to the carbonyl carbon helps distinguish aldehydes from other carbonyl compounds using ¹H NMR spectroscopy. The closeness of aldehydic hydrogen to the electrophilic carbonyl carbon highly deshields the hydrogen atom causing its signal to appear around 10 ppm in the ¹H NMR spectra. α hydrogens split the aldehydic proton signal, which helps identify the number of α hydrogens in the molecule. For instance, one α hydrogen creates a doublet for an aldehydic...
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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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Methods to Identify the NMR Resonances of the 13C-Dimethyl N-terminal Amine on Reductively Methylated Proteins
13:59

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Published on: December 12, 2013

Measuring protein concentrations by NMR spectroscopy.

Gerhard Wider1, Lars Dreier

  • 1Contribution from the Institut für Molekularbiologie und Biophysik ETH Zürich, Switzerland. gsw@mol.biol.ethz.ch

Journal of the American Chemical Society
|February 24, 2006
PubMed
Summary

We developed PULCON, a new Nuclear Magnetic Resonance (NMR) method to accurately measure biological macromolecule concentrations. This technique avoids issues with reference compounds, offering a robust alternative to UV spectroscopy for NMR samples.

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Area of Science:

  • Biophysical Chemistry
  • Structural Biology
  • Analytical Chemistry

Background:

  • Accurate concentration measurement is crucial for Nuclear Magnetic Resonance (NMR) experiments on biological macromolecules.
  • Traditional methods using reference compounds are often problematic due to potential interactions and spectral overlap.
  • Existing methods struggle to correlate signal intensity with known concentrations for macromolecules in solution.

Purpose of the Study:

  • To introduce a novel NMR-based method, PULCON, for precise determination of macromolecule concentrations.
  • To provide an alternative to conventional concentration measurement techniques like UV spectroscopy.
  • To offer a robust and widely applicable solution for NMR sample characterization.

Main Methods:

  • PULCON correlates absolute signal intensities from two NMR spectra acquired under different solution conditions.
  • The method does not require specialized hardware or software, making it broadly accessible.
  • It bypasses the need for external reference compounds, avoiding potential sample interactions.

Main Results:

  • PULCON accurately determines the concentration of biological macromolecules in NMR samples.
  • The method is robust and easy to implement on standard NMR spectrometers.
  • Demonstrated potential to replace UV spectroscopy for routine NMR sample concentration analysis.

Conclusions:

  • PULCON offers a reliable and accurate method for determining NMR sample concentrations.
  • This technique simplifies experimental planning and data interpretation for macromolecular NMR studies.
  • PULCON presents a significant advancement in the characterization of biological samples for NMR analysis.