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When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
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In the AX proton spin system, proton A can sense the two spin states of a coupled proton X, resulting in a doublet NMR signal with two peaks of equal (1:1) intensity. When proton A is coupled to two equivalent protons (AX2 spin system), the spin states of each X can be aligned with or against the external field, creating three possible scenarios. This results in a 1:2:1  triplet signal, where the central peak corresponds to the chemical shift of A and is twice as large or intense as the...
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When protons A and X are coupled, their nuclear spin energy levels are slightly modified. This is because the energy required to excite proton A to a spin state parallel to proton X is slightly different from the energy required for it to become anti-parallel to spin X. Consequently, there are two possible excitation frequencies for A (A1 and A2), depending on the spin state of X, and vice versa. The mutual nature of coupling implies that the difference between frequencies A1 and A2, indicated...
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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.
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The intensity of a signal, which can be represented by the area under the peak, depends on the number of protons contributing to that signal. The area under each peak is shown as a vertical line called an integral, with the integral value listed under it, as seen in the proton NMR spectrum of benzyl acetate. Each integral value is divided by the smallest integral value to obtain the ratio of the number of protons producing each signal. The ratio reveals the relative number of protons and not...
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Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
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REDEN: Interactive multi-fitting decomposition-based NMR peak picking assistant.

Mehdi Rahimi1, Abigail Chiu1, Andrea Estefania Lopez Giraldo1

  • 1Department of Chemistry, University of Colorado Denver, Denver, CO 80204, USA.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|December 1, 2023
PubMed
Summary
This summary is machine-generated.

We introduce REDEN (Residual Decomposition of NMR peaks), a new open-source software for identifying peaks in NMR spectra. This tool enhances spectral analysis through interactive peak decomposition and multi-fitting options.

Keywords:
Graphical user interfaceMulti-fittingPOKYPeak decompositionREDEN

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Computational Chemistry

Background:

  • Nuclear Magnetic Resonance (NMR) spectroscopy is crucial for molecular structure determination.
  • Accurate peak identification in NMR spectra is essential for reliable data analysis.
  • Existing methods for peak picking can be labor-intensive and require manual intervention.

Purpose of the Study:

  • To develop and present a novel software tool, REDEN (Residual Decomposition of NMR peaks), for automated and interactive peak identification in NMR spectra.
  • To provide an efficient and user-friendly solution for spectral data processing.
  • To enhance the accuracy and speed of NMR spectral analysis.

Main Methods:

  • REDEN employs a peak decomposition approach in the frequency domain.
  • The software integrates with the POKY suite, offering an interactive workflow (iPick).
  • Multi-fitting of simulated peaks is performed using four lineshape options: Gaussian, Lorentzian, fast/optimized Lorentzian, and Pseudo-Voigt.

Main Results:

  • REDEN facilitates explicit peak picking through visual decomposition of NMR signals.
  • The software offers two operating modes (Basic and Advanced) for user-defined fine-tuning.
  • Integration with the POKY suite ensures a seamless and efficient user experience.

Conclusions:

  • REDEN provides a powerful, open-source solution for NMR spectral peak identification.
  • The software's interactive nature and advanced fitting options improve the efficiency and accuracy of NMR data analysis.
  • REDEN is readily available as part of the POKY suite, promoting accessibility for researchers.