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Related Concept Videos

Two-Dimensional (2D) NMR: Overview01:12

Two-Dimensional (2D) NMR: Overview

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.
The first step is the preparation period, during which nucleus A is excited with a radiofrequency pulse.
2D NMR: Overview of Homonuclear Correlation Techniques01:16

2D NMR: Overview of Homonuclear Correlation Techniques

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.
COSY90 is the standard two-dimensional (2D) COSY experiment that...
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

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.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are slanted or...
Interpreting ¹H NMR Signal Splitting: The (n + 1) Rule01:10

Interpreting ¹H NMR Signal Splitting: The (n + 1) Rule

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 others.
2D NMR: Overview of Heteronuclear Correlation Techniques01:18

2D NMR: Overview of Heteronuclear Correlation Techniques

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 axis.
¹H NMR of Conformationally Flexible Molecules: Temporal Resolution00:52

¹H NMR of Conformationally Flexible Molecules: Temporal Resolution

At room temperature, the chair conformer of cyclohexane undergoes rapid ring flipping between two equivalent chair conformers at a rate of approximately 105 times per second. These two chair conformers are in equilibrium. The rapid ring flipping results in the interconversion of the axial proton to an equatorial proton and an equatorial to the axial proton. Such interconversions are too rapid and cannot be detected on the NMR timescale. Hence, the NMR spectrometer cannot distinguish between the...

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Nuclear Magnetic Resonance Spectroscopy for the Identification of Multiple Phosphorylations of Intrinsically Disordered Proteins
12:47

Nuclear Magnetic Resonance Spectroscopy for the Identification of Multiple Phosphorylations of Intrinsically Disordered Proteins

Published on: December 27, 2016

Random phase detection in multidimensional NMR.

Mark W Maciejewski1, Matthew Fenwick, Adam D Schuyler

  • 1Department of Molecular, Microbial, and Structural Biology, University of Connecticut Health Center, 263 Farmington Avenue, Farmington, CT 06030-3305, USA.

Proceedings of the National Academy of Sciences of the United States of America
|September 28, 2011
PubMed
Summary
This summary is machine-generated.

Random phase detection in NMR experiments significantly reduces measurement time by a factor of two per dimension, enabling faster acquisition of complex biomolecular data. This method also improves spectral resolution, offering enhanced insights into molecular structures.

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Area of Science:

  • Biophysics
  • Spectroscopy
  • Data Science

Background:

  • High-field superconducting magnets advance NMR resolution, but multidimensional NMR is crucial for biomolecular applications.
  • Practical time constraints and the need for sign discrimination limit achievable resolution in NMR experiments.
  • Current methods for sign discrimination in indirect dimensions require a factor of 2 increase in sampling, extending measurement times.

Purpose of the Study:

  • To introduce and evaluate a novel random phase detection method for multidimensional NMR.
  • To demonstrate the potential of random phase detection to reduce experiment time and/or improve resolution.
  • To explore the compatibility of random phase detection with other advanced NMR techniques.

Main Methods:

  • Implemented random phase detection by altering detector phase randomly at each time sample point in indirect dimensions.
  • Analyzed the impact of random phase detection on sign ambiguity, experiment time, and spectral resolution.
  • Investigated the combination of random phase detection with nonuniform sampling methods.

Main Results:

  • Random phase detection resolves sign ambiguity without requiring additional receiver phases or higher sampling rates.
  • This method reduces experiment time by a factor of 2 for each indirect dimension (e.g., factor of 8 for 4D NMR).
  • Alternatively, random phase detection can double spectral resolution in indirect dimensions for a fixed measurement time, albeit with sampling artifacts.

Conclusions:

  • Random phase detection offers a significant advantage in accelerating multidimensional NMR experiments and enhancing spectral resolution.
  • The technique is complementary to nonuniform sampling, suggesting combined approaches for further benefits.
  • Potential applications extend beyond biomolecular NMR to magnetic resonance imaging and other signal processing fields.