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Related Concept Videos

Chemical Shift: Internal References and Solvent Effects01:17

Chemical Shift: Internal References and Solvent Effects

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In an NMR sample, precise measurement of the absolute absorption frequencies of nuclei is difficult. A standard internal reference compound is added, and the frequency difference between the reference signal and sample signals is measured.
The internal reference compound generally used in NMR spectroscopy is tetramethylsilane (TMS). TMS is preferred because it is chemically inert, soluble in NMR solvents, and easily removable. Also, the highly shielded methyl protons in TMS yield an intense...
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Double Resonance Techniques: Overview01:12

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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...
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¹³C NMR: ¹H–¹³C Decoupling01:04

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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.
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¹H NMR: Interpreting Distorted and Overlapping Signals01:02

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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.
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¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR01:15

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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)01:15

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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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Efficient solvent suppression with adiabatic inversion for 1H-detected solid-state NMR.

Tatsuya Matsunaga1, Ryotaro Okabe2, Yoshitaka Ishii3,4

  • 1RIKEN Center for Biosystems Dynamics Research, RIKEN, 1-7-22 Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa, 230-0045, Japan.

Journal of Biomolecular NMR
|October 21, 2021
PubMed
Summary
This summary is machine-generated.

A new method called Solvent suppression of Liquid signal with Adiabatic Pulse (SLAP) improves solvent suppression in solid-state NMR. This technique enhances signal detection for biomolecules using less radiofrequency power.

Keywords:
1H-detected multidimensional solid-state NMRBiomolecular solid-state NMRSolvent suppression pulseUltra-fast magic angle spinning

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Area of Science:

  • Biophysical Chemistry
  • Spectroscopy
  • Materials Science

Background:

  • Proton-detected multidimensional solid-state NMR (SSNMR) is crucial for analyzing biomolecules and other materials.
  • Effective solvent suppression is essential to overcome overwhelming solvent signals and improve spectral quality in SSNMR.
  • Existing solvent suppression techniques, like MISSISSIPPI, can be limited in performance and require significant radiofrequency power.

Purpose of the Study:

  • To introduce a novel solvent suppression scheme for proton-detected multidimensional SSNMR.
  • To evaluate the performance of the new scheme, termed Solvent suppression of Liquid signal with Adiabatic Pulse (SLAP), against existing methods.
  • To demonstrate the utility of SLAP for analyzing biomolecular samples using ultra-fast magic angle spinning.

Main Methods:

  • Development of a new solvent suppression scheme utilizing adiabatic inversion pulses.
  • Implementation of the SLAP scheme in 1H-detected 2D 13C/1H SSNMR experiments.
  • Utilized ultra-fast magic angle spinning (60 kHz) for analyzing uniformly 13C- and 15N-labeled GB1 samples.

Main Results:

  • The SLAP scheme demonstrated up to 3.5-fold better solvent suppression performance compared to the traditional MISSISSIPPI scheme.
  • SLAP achieved superior solvent suppression using approximately two-thirds of the average radiofrequency power required by MISSISSIPPI.
  • The enhanced suppression enabled clearer detection of signals from the biomolecular sample.

Conclusions:

  • The SLAP scheme represents a significant advancement in solvent suppression for 1H-detected SSNMR.
  • SLAP offers improved performance and efficiency, making it a valuable tool for studying biomolecules and other systems.
  • This new method facilitates higher quality data acquisition in solid-state NMR spectroscopy.