Related Experiment Video
Updated: Jul 16, 2026
10:28
Measuring Interactions of Globular and Filamentous Proteins by Nuclear Magnetic Resonance Spectroscopy (NMR) and Microscale Thermophoresis (MST)
Published on: November 2, 2018
Transverse dephasing optimized solid-state NMR spectroscopy.
G De Paëpe1, N Giraud, A Lesage
1Laboratoire de Chimie, UMR 5182 CNRS/ENS, Laboratoire de Recherche Conventionné du CEA (no. 23V), Ecole Normale Supérieure de Lyon, 69364 Lyon, France.
Journal of the American Chemical Society
|November 13, 2003
Summary
New decoupling schemes enhance coherence lifetimes in solid-state Nuclear Magnetic Resonance (NMR) experiments. These advanced methods optimize dephasing times, doubling performance and improving sensitivity by up to fivefold in complex materials.
Area of Science:
- Solid-state Nuclear Magnetic Resonance (NMR) spectroscopy.
- Quantum control and coherence manipulation.
- Materials science and biophysics.
Background:
- Coherence lifetimes are critical for sensitivity in solid-state NMR.
- Existing decoupling schemes have limitations in optimizing dephasing times.
- Improving NMR performance is essential for analyzing complex biological and disordered systems.
Purpose of the Study:
- To introduce novel decoupling schemes for controlling coherence lifetimes in solid-state NMR.
- To actively optimize dephasing times beyond current state-of-the-art methods.
- To demonstrate the practical application and benefits of these schemes in challenging samples.
Main Methods:
- Development and implementation of new active dephasing time optimization schemes.
- Application of these schemes to transverse-dephasing-optimized (TDOP) NMR experiments.
- Testing on disordered solid cellulose and microcrystalline protein samples.
Main Results:
- Achieved increases in coherence lifetimes of up to a factor of 2 compared to existing schemes.
- Demonstrated significant sensitivity improvements, up to a factor of 5, in TDOP NMR experiments.
- Successfully controlled and extended dephasing times in solid-state NMR.
Conclusions:
- The developed decoupling schemes offer a powerful new tool for enhancing solid-state NMR experiments.
- These methods significantly improve sensitivity and spectral quality for challenging samples.
- Active optimization of dephasing times is a viable strategy for advancing NMR capabilities.
Related Concept Videos
01:20NMR Spectrometers: Overview
NMR spectrometers consist of a strong magnet, a radiofrequency transmitter, and a detector attached to a computer console for recording spectra of samples containing NMR-active nuclei. In first-generation NMR instruments called continuous-wave spectrometers, the resonance frequencies of the nuclei are determined by frequency-sweep or field-sweep methods. The magnetic field strength is fixed and the rf signal is swept in the former, while the radiofrequency signal is fixed and the magnetic field...
01:15NMR Spectroscopy: Chemical Shift Overview
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...
01:08NMR Spectroscopy: Spin–Spin Coupling
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 in...
01:04¹³C NMR: ¹H–¹³C Decoupling
The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
01:162D 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...
COSY90 is the standard two-dimensional (2D) COSY experiment that...
01:182D 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.