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¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

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.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are slanted or...
¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR01:15

¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR

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.
¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C 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...
Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)01:15

Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)

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...
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...
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.

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関連する実験動画

Updated: Jul 5, 2026

NMR-Based Fragment Screening in a Minimum Sample but Maximum Automation Mode
09:19

NMR-Based Fragment Screening in a Minimum Sample but Maximum Automation Mode

Published on: June 4, 2021

競争を拘束する実験による高通量NMRベースのスクリーニング.

Claudio Dalvit1, Maria Flocco, Stefan Knapp

  • 1Chemistry Department, Pharmacia, Viale Pasteur 10, 20014 Nerviano (MI), Milan, Italy. claudio.dalvit@pharmacia.com

Journal of the American Chemical Society
|June 27, 2002
PubMed
まとめ
この要約は機械生成です。

この研究では,高通量スクリーニングのための新しいNMRスペクトルスコピーの方法が導入され,高親和性および共性リガンドの検出の限界を克服しました. この技術は化合物の多様性を高め,何千もの分子の迅速なスクリーニングを可能にします.

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High-Pressure NMR Experiments for Detecting Protein Low-Lying Conformational States
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High-Pressure NMR Experiments for Detecting Protein Low-Lying Conformational States

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NMR 15N Relaxation Experiments for the Investigation of Picosecond to Nanoseconds Structural Dynamics of Proteins
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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: Jul 5, 2026

NMR-Based Fragment Screening in a Minimum Sample but Maximum Automation Mode
09:19

NMR-Based Fragment Screening in a Minimum Sample but Maximum Automation Mode

Published on: June 4, 2021

High-Pressure NMR Experiments for Detecting Protein Low-Lying Conformational States
04:37

High-Pressure NMR Experiments for Detecting Protein Low-Lying Conformational States

Published on: June 29, 2021

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

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科学分野:

  • バイオケミストリー バイオケミストリー
  • 化学生物学 化学生物学とは
  • 構造生物学 構造生物学とは

背景:

  • リガンドベースのNMRスクリーニングは,高親和性および共結合結合分子と闘っています.
  • 制限された検出範囲は,NMRでスクリーニングされる化合物の多様性を制限します.

研究 の 目的:

  • 高通量スクリーニングのための新しいNMRスペクトロスコピーのアプローチを開発する.
  • リガンドおよび分子検出のための既存のNMRスクリーニング方法の限界を克服するために.
  • 溶解度が低い化合物を含め,NMRスクリーニングに適した化合物の範囲を拡大する.

主な方法:

  • 横断的および/または選択的縦断的なリラックスパラメータを使用します.
  • 競争を拘束する実験を含みます.
  • 実験のセットアップと結合定数の近似のための数学的式を導出します.

主要な成果:

  • 新しいNMRスクリーニング方法論を成功裏に開発しました.
  • 高親和性および共結合結合リガンドの検出における制限を克服します.
  • 限界に溶ける化合物の検出を可能にし,スクリーニングされた化合物の多様性を高めます.
  • 生物学的標的に対する何千もの化合物の迅速なスクリーニングを可能にします.
  • 植物と真菌の抽出物をスクリーニングする適用性を実証します.

結論:

  • この新しいNMRスクリーニング方法は,高通量スクリーニング能力を大幅に向上させています.
  • この技術は,NMRベースの薬剤発見と天然製品のスクリーニングの範囲を拡大します.
  • このアプローチは,新しいリガンドや生物活性化合物を特定するためのより包括的で効率的なプラットフォームを提供します.