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Related Concept Videos

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.
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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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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.
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NMR Spectroscopy Of Amines01:19

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In proton NMR spectroscopy, primary amines and secondary amines showcase their N–H protons as a broad signal in the chemical shift range between δ 0.5 and 5 ppm. The exact position in this range depends on several factors, including sample concentration, hydrogen bonding, and the type of solvent used. Since amine protons undergo fast proton exchange in solution, the protons are labile and therefore do not participate in any splitting with adjacent protons. Thus, the observed peak is broad and...
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The axial and equatorial protons in cyclohexane can be distinguished by performing a variable-temperature NMR experiment. In this process, except for one proton, the remaining eleven protons are replaced by deuterium. The deuterium substitution avoids the possible peak splitting caused by the spin-spin coupling between the adjacent protons. The remaining proton flips between the axial and equatorial positions.
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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...

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A new method for detecting exchanging amide protons using chemical exchange rotation transfer.

Zhongliang Zu1, Vaibhav A Janve, Junzhong Xu

  • 1Vanderbilt University Institute of Imaging Science, Vanderbilt University, Nashville, Tennessee 37232-2310, USA.

Magnetic Resonance in Medicine
|April 17, 2012
PubMed
Summary

This study presents a novel amide proton transfer imaging method using chemical exchange rotation transfer. This technique overcomes artifacts from conventional methods, enabling better imaging of proteins, peptides, and pH mapping.

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Area of Science:

  • Biomedical Imaging
  • Magnetic Resonance Imaging
  • Chemical Exchange Transfer

Background:

  • Conventional chemical exchange saturation transfer (CEST) methods for amide proton transfer (APT) imaging suffer from artifacts.
  • These artifacts include sensitivity to B(0) inhomogeneities, asymmetric macromolecular resonances, and lipid signal interference.
  • Signal overlap from amines and hydroxyls further complicates APT imaging interpretation.

Purpose of the Study:

  • Introduce a new method for APT imaging.
  • Overcome limitations of conventional CEST-based APT imaging.
  • Improve imaging of endogenous protein/peptide content and pH mapping.

Main Methods:

  • Utilize chemical exchange rotation transfer (CERT) for APT imaging.
  • Employ varying irradiation pulse rotation angles (π and 2π radians) for label and reference scans.
  • Avoid frequency offsets used in conventional CEST methods.

Main Results:

  • The new CERT-based method avoids artifacts associated with B(0) inhomogeneities.
  • It mitigates issues from asymmetric macromolecular resonances and lipid signal interference.
  • The method reduces signal overlap, leading to clearer amide signal detection.

Conclusions:

  • The CERT-based APT imaging method offers a promising alternative to conventional techniques.
  • It provides improved accuracy for imaging endogenous protein and peptide content.
  • This technique is valuable for quantitative pH mapping in biological tissues.