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関連する概念動画

NMR Spectrometers: Overview01:20

NMR 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...
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.
2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)01:19

2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)

Heteronuclear single-quantum correlation spectroscopy (HSQC) is a 2D NMR technique that reveals one-bond correlations between hydrogen and a heteronucleus. The HSQC experiment is similar to the heteronuclear correlation experiment (HETCOR) but is more sensitive. In the HSQC spectrum, the proton chemical shift is plotted on the horizontal F2 axis, while the 13C chemical shift is plotted on the vertical F1 axis. The corresponding proton and 13C spectra are also shown. The HSQC contour plot does...
NMR Spectroscopy of Aromatic Compounds01:14

NMR Spectroscopy of Aromatic Compounds

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. Consider...
NMR Spectroscopy: Chemical Shift Overview01:15

NMR 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...
NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.

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関連する実験動画

Updated: Jun 25, 2026

Rapid Scan Electron Paramagnetic Resonance Opens New Avenues for Imaging Physiologically Important Parameters In Vivo
08:01

Rapid Scan Electron Paramagnetic Resonance Opens New Avenues for Imaging Physiologically Important Parameters In Vivo

Published on: September 26, 2016

シングルスキャンNMRスペクトロスコピーは任意の寸法で測定されます.

Yoav Shrot1, Lucio Frydman

  • 1Department of Chemical Physics, Weizmann Institute of Science, 76100 Rehovot, Israel.

Journal of the American Chemical Society
|October 14, 2005
PubMed
まとめ
この要約は機械生成です。

超高速多次元核磁気共鳴 (NMR) はデータ取得を加速する. この新しい方法は,単一のトランジント内で完全なn次元NMRスペクトルの収集を可能にし,実験時間を大幅に短縮します.

さらに関連する動画

Nuclear Magnetic Resonance Spectroscopy for the Identification of Multiple Phosphorylations of Intrinsically Disordered Proteins
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Nuclear Magnetic Resonance Spectroscopy for the Identification of Multiple Phosphorylations of Intrinsically Disordered Proteins

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NMR 15N Relaxation Experiments for the Investigation of Picosecond to Nanoseconds Structural Dynamics of Proteins
09:25

NMR 15N Relaxation Experiments for the Investigation of Picosecond to Nanoseconds Structural Dynamics of Proteins

Published on: November 1, 2024

関連する実験動画

Last Updated: Jun 25, 2026

Rapid Scan Electron Paramagnetic Resonance Opens New Avenues for Imaging Physiologically Important Parameters In Vivo
08:01

Rapid Scan Electron Paramagnetic Resonance Opens New Avenues for Imaging Physiologically Important Parameters In Vivo

Published on: September 26, 2016

Nuclear Magnetic Resonance Spectroscopy for the Identification of Multiple Phosphorylations of Intrinsically Disordered Proteins
12:47

Nuclear Magnetic Resonance Spectroscopy for the Identification of Multiple Phosphorylations of Intrinsically Disordered Proteins

Published on: December 27, 2016

NMR 15N Relaxation Experiments for the Investigation of Picosecond to Nanoseconds Structural Dynamics of Proteins
09:25

NMR 15N Relaxation Experiments for the Investigation of Picosecond to Nanoseconds Structural Dynamics of Proteins

Published on: November 1, 2024

科学分野:

  • アナリティカル・ケミストリー (Analytical Chemistry) とは
  • バイオケミストリー バイオケミストリー
  • スペクトロスコーピーは,スペクトロスコーピーを用います.

背景:

  • 多次元核磁共振 (NMR) は,複雑な分子構造と動態の分析に不可欠です.
  • 伝統的なNMR実験では,特により高い次元 (2D,3Dなど) の場合,広範な取得時間が求められます. ) を実施する.
  • 現在の方法は,連続したデータ収集を伴うため,実験速度を制限しています.

研究 の 目的:

  • 以前に開発された並列の2D NMRデータ取得方法をn次元に拡張する.
  • 超高速のn次元NMRの原理を紹介し,説明する.
  • 複雑なNMRスペクトルを迅速に取得する可能性を実証する.

主な方法:

  • 多次元のNMRのための並列データ取得戦略の開発と適用.
  • 2D NMRの並列化技術を任意の数の次元 (n次元NMR) に拡張する.
  • スペクトル再構築のための時間領域信号のフーリエ解析.

主要な成果:

  • 超高速なn次元NMRアプローチの実証.
  • 3Dおよび4DNMRスペクトルの完全な収集が成功しました.
  • スペクトルの取得は秒のほんの一部分で,実験期間を大幅に短縮します.

結論:

  • 提案されている超高速のn次元NMR方法論は,スペクトル獲得を大幅に加速します.
  • このアプローチにより,複雑な分子の構造とダイナミクスを素早く解明することができます.
  • このテクニックは,ホモ核およびヘテロ核の両方のNMR実験に適用できます.