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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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Homonuclear correlation spectroscopy (COSY) is a powerful technique used in Nuclear Magnetic Resonance (NMR) spectroscopy to study the correlations between nuclei of the same type within a molecule. It provides information about scalar couplings between adjacent nuclei, which helps determine connectivity and structural information. There are several COSY variants, each with its unique strengths and experimental parameters.
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2D NMR: Overview of Heteronuclear Correlation Techniques01:18

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Heteronuclear correlation spectroscopy is an analytical technique that investigates the coupling between different types of nuclei, often a proton and an X-nucleus, such as carbon-13 or nitrogen-15. This method is commonly used in nuclear magnetic resonance (NMR) spectroscopy to gain insights into complex chemical compounds' structural and compositional aspects. A typical heteronuclear correlation spectrum displays X-nucleus chemical shifts on one axis and a proton spectrum on the other...
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In an NMR sample, precise measurement of the absolute absorption frequencies of nuclei is difficult. A standard internal reference compound is added, and the frequency difference between the reference signal and sample signals is measured.
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The 1D NMR spectrum of large and complex molecules like natural products has complicated splitting patterns and overlapping signals, which can be easily interpreted using 2-dimensional (2D) NMR. Unlike 1D NMR, 2D NMR has two frequency axes that provide the coupling information between the nucleus A and nucleus B in a molecule. The process from which 2D spectra are obtained has four steps.
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NMR spectrometers consist of a strong magnet, a radiofrequency transmitter, and a detector attached to a computer console for recording spectra of samples containing NMR-active nuclei. In first-generation NMR instruments called continuous-wave spectrometers, the resonance frequencies of the nuclei are determined by frequency-sweep or field-sweep methods. The magnetic field strength is fixed and the rf signal is swept in the former, while the radiofrequency signal is fixed and the magnetic field...
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Acquiring and processing ultrafast biomolecular 2D NMR experiments using a referenced-based correction.

Amir Seginer1, Gregory L Olsen1, Lucio Frydman2

  • 1Department of Chemical Physics, Weizmann Institute of Science, 76100, Rehovot, Israel.

Journal of Biomolecular NMR
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PubMed
Summary

This study introduces an automated algorithm to correct inconsistencies in ultrafast Nuclear Magnetic Resonance (NMR) data. This method improves spectral width and is validated for biomolecular NMR experiments.

Keywords:
Echo planar spectroscopic imagingInterlaced Fourier transformationProtein NMRSensitivity enhancementSignal-to-noise ratioUltrafast 2D NMR

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Area of Science:

  • Nuclear Magnetic Resonance (NMR) Spectroscopy
  • Biomolecular NMR
  • Magnetic Resonance Imaging (MRI)

Background:

  • Ultrafast (UF) NMR sequences enable rapid acquisition of 2D spectra after a single excitation.
  • These sequences trace a path in the [Formula: see text]-[Formula: see text] plane, requiring 1D Fourier transformation for spectral data.
  • Bandwidth limitations arise from simultaneously digitizing two domains, particularly along the [Formula: see text]/[Formula: see text] dimension due to non-equispaced odd/even time points and gradient artifacts.

Purpose of the Study:

  • To develop an algorithm for automatic correction of even/odd ultrafast NMR data inconsistencies.
  • To overcome limitations in spectral width caused by separate Fourier transformation of odd and even time points.
  • To provide a robust method for correcting data, especially for low signal-to-noise ratio biomolecular NMR experiments.

Main Methods:

  • An algorithm was developed for automatic correction of even/odd ultrafast NMR inconsistencies.
  • The method utilizes a reference scan acquired on the solvent.
  • Experimental validation was performed using a [Formula: see text]-[Formula: see text] UF-HSQC variant on ubiquitin at 600 MHz.

Main Results:

  • The algorithm successfully corrected even/odd ultrafast NMR inconsistencies.
  • The method demonstrated effectiveness in improving spectral width limitations.
  • Experimental verification confirmed the algorithm's utility in a practical biomolecular NMR scenario.

Conclusions:

  • The developed algorithm provides an automated solution for correcting ultrafast NMR data inconsistencies.
  • This method enhances spectral width and is particularly beneficial for low signal-to-noise ratio experiments.
  • The study discusses the features of this automatic correction method and interlaced Fourier transformation in general.