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Related Concept Videos

Electron Paramagnetic Resonance (EPR) Spectroscopy: Organic Radicals01:17

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Ideally, an unpaired electron shows a single peak in the EPR spectrum due to the transition between the two spin energy states. However, coupling interactions can occur between the spins of the unpaired electron and any neighboring spin-active nuclei. This hyperfine coupling results in hyperfine splitting, where the EPR signal is split into multiplets. The signals split into 2nI + 1 peaks, where n is the number of equivalent nuclei and I is the nuclear spin. These splitting patterns provide...
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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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Applications Of NMR In Biology01:25

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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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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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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.
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Using Electron Paramagnetic Resonance Spectroscopy To Facilitate Problem Solving in Pharmaceutical Research and

Ian Mangion1, Yizhou Liu1, Mikhail Reibarkh1

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Electron paramagnetic resonance spectroscopy is a valuable tool for studying single-electron chemistry reactions and impurities in pharmaceutical development. This technique aids process and analytical chemists in addressing challenges in modern drug discovery.

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Area of Science:

  • Chemistry
  • Spectroscopy
  • Pharmaceutical Science

Background:

  • Emerging single-electron chemistry methodologies require new analytical approaches.
  • Electron paramagnetic resonance (EPR) spectroscopy is a established technique for studying paramagnetic species.
  • Traditional applications of EPR have expanded into contemporary pharmaceutical development.

Purpose of the Study:

  • To highlight the utility of EPR spectroscopy in modern pharmaceutical development.
  • To demonstrate EPR's application in studying reactions driven by single-electron chemistry.
  • To showcase EPR's role in identifying and tracking undesired impurities.

Main Methods:

  • Utilizing electron paramagnetic resonance (EPR) spectroscopy.
  • Applying EPR to study reactions involving single-electron chemistry.
  • Employing EPR for impurity profiling in pharmaceutical development.

Main Results:

  • EPR spectroscopy effectively characterizes paramagnetic species in chemical reactions.
  • EPR aids in understanding reaction mechanisms in single-electron chemistry.
  • EPR successfully identifies and quantifies undesired impurities in pharmaceutical processes.

Conclusions:

  • Electron paramagnetic resonance (EPR) spectroscopy is a powerful technique for pharmaceutical process and analytical chemists.
  • EPR facilitates problem-solving in the context of single-electron chemistry.
  • Case studies demonstrate the practical utility of EPR in modern drug development.