Related Experiment Video
Updated: Feb 5, 2026
07:54
Assessing Hepatic Metabolic Changes During Progressive Colonization of Germ-free Mouse by 1H NMR Spectroscopy
Published on: December 15, 2011
13.5K
High-fidelity spectroscopy reconstruction in accelerated NMR
Xiaobo Qu1, Tianyu Qiu, Di Guo
1Department of Electronic Science, Fujian Provincial Key Laboratory of Plasma and Magnetic Resonance, Xiamen University, Xiamen 361005, China. quxiaobo@xmu.edu.cn.
Chemical Communications (Cambridge, England)
|September 11, 2018
Summary
Non-uniform sampling accelerates NMR spectroscopy data acquisition. A new high-fidelity reconstruction method preserves weak signals and ensures stable results across various sampling trials.
Area of Science:
- Nuclear Magnetic Resonance (NMR) Spectroscopy
- Spectroscopic Data Analysis
Background:
- Non-uniform sampling (NUS) accelerates Nuclear Magnetic Resonance (NMR) data acquisition.
- Effective spectral reconstruction is crucial for NUS data to avoid artifacts and information loss.
Purpose of the Study:
- To develop a high-fidelity spectral reconstruction method for non-uniformly sampled NMR data.
- To preserve low-intensity spectral peaks often lost in standard reconstruction methods.
Main Methods:
- Development of a novel reconstruction algorithm tailored for NUS data.
- Testing the method's performance across diverse sampling densities and spectral types.
Main Results:
- The proposed method successfully preserves low-intensity spectral peaks.
- Stable and accurate spectral reconstruction was achieved under various sampling conditions.
Conclusions:
- The developed high-fidelity reconstruction method enhances the utility of NUS in NMR spectroscopy.
- This approach offers reliable spectral analysis even with accelerated data acquisition.
Related Concept Videos
01:19NMR Spectroscopy Of Amines
11.1K
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...
11.1K
01:14NMR Spectroscopy of Aromatic Compounds
6.3K
Aromatic compounds can be identified or analyzed using proton NMR and carbon‐13 NMR. Typically, aromatic hydrogens or hydrogens directly bonded to the aromatic rings are strongly deshielded by the aromatic ring current. Therefore, they absorb in the range of 6.5–8.0 ppm in proton NMR spectra. For instance, aromatic hydrogens directly bonded to the benzene ring absorb at 7.3 ppm. However, aromatic hydrogens of larger rings absorb farther upfield or downfield than the ideal range.
6.3K
01:34NMR Spectroscopy of Benzene Derivatives
11.2K
Simple unsubstituted benzene has six aromatic protons, all chemically equivalent. Therefore, benzene exhibits only a singlet peak at δ 7.3 ppm in the 1H NMR spectrum. The observed shift is far downfield because the aromatic ring current strongly deshields the protons. Any substitution on the benzene ring makes the aromatic protons nonequivalent, and the protons split each other. The peak is, therefore, no longer a singlet and the splitting pattern and their associated coupling...
11.2K
01:15NMR Spectroscopy: Chemical Shift Overview
3.3K
The position of the absorption signal of a sample is reported relative to the position of the signal of tetramethylsilane (TMS), which is added as an internal reference while recording spectra. The difference between the absorption frequencies of the sample and TMS (in Hz) is divided by the spectrometer operating frequency (in MHz) to obtain a dimensionless quantity called the chemical shift. It is reported on the δ (delta) scale and expressed in parts per million.
For instance, the proton...
For instance, the proton...
3.3K
01:08NMR Spectroscopy: Spin–Spin Coupling
3.2K
The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...
3.2K
01:30NMR and Mass Spectroscopy of Carboxylic Acids
5.3K
In ¹H NMR spectroscopy, acidic protons (–COOH) of carboxylic acids are highly deshielded and absorb far downfield, at around 9–12 ppm. The chemical shift value depends on the concentration and solvent used.
While α protons of carboxylic acids absorb at 2–2.5 ppm, β protons absorb further upfield.
Carboxylic acids are easily identified by dissolving them in deuterium oxide, which results in a rapid exchange of the acidic protons with deuterium. This leads to the...
While α protons of carboxylic acids absorb at 2–2.5 ppm, β protons absorb further upfield.
Carboxylic acids are easily identified by dissolving them in deuterium oxide, which results in a rapid exchange of the acidic protons with deuterium. This leads to the...
5.3K