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Related Concept Videos

NMR Spectrometers: Resolution and Error Correction01:14

NMR Spectrometers: Resolution and Error Correction

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...
Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)01:15

Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)

Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

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.
Spin decoupling is usually achieved by...
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...
¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

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...
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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Dissolution Dynamic Nuclear Polarization Instrumentation for Real-time Enzymatic Reaction Rate Measurements by NMR
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Improved Resolution in Dipolar NMR Spectra Using Constant Time Evolution PISEMA Experiment.

T Gopinath1, Gianluigi Veglia

  • 1Department of Biochemistry, Molecular Biology, and Biophysics, University of Minnesota, Minneapolis, MN 55455.

Chemical Physics Letters
|September 4, 2010
PubMed
Summary

New nuclear magnetic resonance (NMR) pulse schemes enhance resolution for measuring atomic structures. These advanced methods improve the analysis of dipolar couplings (DC) and chemical shifts (CS) in complex molecular samples.

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Area of Science:

  • Nuclear Magnetic Resonance (NMR) Spectroscopy
  • Structural Biology
  • Materials Science

Background:

  • Anisotropic NMR parameters like dipolar couplings (DC) and chemical shifts (CS) are crucial for determining the atomic structure of molecules and polypeptides.
  • Separated local field experiments enable 2D correlation of DC and CS, but spectral crowding often limits resolution.
  • Overcoming spectral crowding is essential for detailed structural analysis using NMR.

Purpose of the Study:

  • To develop novel NMR pulse schemes for high-resolution measurement of DC and CS correlations.
  • To enhance spectral resolution in multidimensional NMR experiments, particularly for oriented samples.
  • To address the limitations imposed by crowded NMR spectra in structural determination.

Main Methods:

  • Design of new pulse schemes based on the PISEMA (Polarization Inversion Spin Exchange at the Magic Angle) experiment.
  • Incorporation of constant time evolution in the dipolar (indirect) dimension for improved resolution.
  • Application of the developed methods to a 4-pentyl-4'-cyanobiphenyl (5CB) liquid crystal sample.

Main Results:

  • Achieved a resolution enhancement of 30-60% in the dipolar dimension for the 5CB sample.
  • Demonstrated the effectiveness of the new pulse schemes in overcoming spectral crowding.
  • Successfully measured high-resolution DC and CS correlations.

Conclusions:

  • The developed NMR pulse schemes significantly improve spectral resolution for oriented samples.
  • These methods offer a pathway to obtain enhanced structural information from complex molecular systems.
  • Potential applications include the study of oriented liquid crystalline samples and membrane proteins.