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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...
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...
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...
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.
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...
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.

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Updated: May 9, 2026

NMR Spectroscopy as a Robust Tool for the Rapid Evaluation of the Lipid Profile of Fish Oil Supplements
08:54

NMR Spectroscopy as a Robust Tool for the Rapid Evaluation of the Lipid Profile of Fish Oil Supplements

Published on: May 1, 2017

Resolution Enhancement in 1D NMR Spectroscopy: A Guide to Using This Underappreciated Tactic.

Jackson C Orr1, Katharine B Toll1, Thomas R Hoye1

  • 1Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, United States.

The Journal of Organic Chemistry
|May 8, 2026
PubMed
Summary
This summary is machine-generated.

Resolution enhancement (RE) significantly improves 1D NMR spectral interpretation for organic chemists. This guide shows how to easily apply RE to NMR data for better spectral analysis and understanding.

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Area of Science:

  • Organic Chemistry
  • Spectroscopy
  • Data Analysis

Background:

  • Nuclear Magnetic Resonance (NMR) spectroscopy is crucial for organic chemists.
  • Interpreting complex 1D NMR spectra can be challenging.
  • Post-acquisition data processing can enhance spectral quality.

Purpose of the Study:

  • To provide a practical guide for organic chemists on using resolution enhancement (RE).
  • To demonstrate the value of RE for 1D NMR spectral interpretation.
  • To guide users on the application of RE techniques.

Main Methods:

  • Introduction to the concept of resolution enhancement (apodization).
  • Description of the ease and speed of applying RE to NMR data (under one minute).
  • Demonstration of RE application on raw or previously processed NMR data.

Main Results:

  • Resolution enhancement (RE) can be applied quickly and easily to NMR data.
  • Enhanced NMR spectra offer improved interpretability.
  • Specific examples illustrate scenarios where RE is beneficial.

Conclusions:

  • Routine use of resolution enhancement (RE) offers significant value for 1D NMR spectral interpretation.
  • Organic chemists can readily incorporate RE into their workflow.
  • RE is a simple yet powerful tool for improving NMR data analysis.