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関連する概念動画

2D NMR: Overview of Homonuclear Correlation Techniques01:16

2D NMR: Overview of Homonuclear Correlation Techniques

450
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...
450
Two-Dimensional (2D) NMR: Overview01:12

Two-Dimensional (2D) NMR: Overview

1.2K
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....
1.2K
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

508
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...
508
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

1.3K
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...
1.3K
2D NMR: Overview of Heteronuclear Correlation Techniques01:18

2D NMR: Overview of Heteronuclear Correlation Techniques

534
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...
534
¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

1.4K
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...
1.4K

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Purification and Reconstitution of TRPV1 for Spectroscopic Analysis
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95GHzでの二次元ESRによって研究されたマイクロ秒交換プロセス

Boris Dzikovski1, Valery V Khramtsov2, Siddarth Chandrasekaran1

  • 1Department of Chemistry and Chemical Biology, and ACERT, National Biomedical Center for Advanced Electron Spin Resonance Technology, Cornell University, Ithaca, New York 14853-1301, United States.

Journal of the American Chemical Society
|December 11, 2020
PubMed
まとめ

2D-ELDORを使用した二次元電子スピン共振 (2D ESR) は,ナノ秒からマイクロ秒の交換プロセスをリアルタイムで研究することができます. この技術は,特に95GHzで,以前には不可能だった,窒素酸化物のスピンラベルにおける化学交換の観測を可能にします.

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Spin Saturation Transfer Difference NMR SSTD NMR: A New Tool to Obtain Kinetic Parameters of Chemical Exchange Processes
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All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
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All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics

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科学分野:

  • 電子パラマグネティック共振 (EPR) スペクトル
  • 化学運動と動力学
  • 生物物理化学

背景:

  • 二次元の核磁共振 (2D NMR) は,クロスピーク分析によるミリ秒の時間スケールでの交換プロセス (構成変化,プロトネーション,結合) を研究するための標準です.
  • 2D-ELDORのような電子スピン共振 (ESR) 技術は,より速い交換プロセス (ナノ秒からマイクロ秒) を研究する可能性を秘めていますが,窒素酸化物などの一般的な探査機の信号解像度によって制限されています.
  • より高いESR周波数 (例えば95GHz) でのgファクターの解像度は,それらの線幅内の交換状態の解像度の制限を克服することができます.

研究 の 目的:

  • 95GHzの2D-ELDORが,窒素のスピンラベルを含む化学交換プロセスを研究する能力を実証する.
  • 生物物理学的および化学的研究に関連するシステムにおける化学的交換から生じるクロスピークの発展を分析する.

主な方法:

  • ACERTでは高度な95GHzの電子スピン共振 (ESR) 計測装置を使用した.
  • クロスピークの発展を観察するために二次元電子-電子二重共振 (2D-ELDOR) を使用した.
  • pHに敏感なイミダゾリン・スピン・ラベルと 酸性と脂質の間の窒素基の分割を研究した.

主要な成果:

  • 95GHzで窒素酸化物のスピンラベルにおける化学的交換によるクロスピークの進化を観察し,分析した.
  • 緩衝 pH と濃度によって制御されたイミダゾリンのスピンラベルのプロトネーション/デプロトネーションダイナミクスの研究が実証された.
  • 脂質ベシクルにおける水性環境とフォスフォリピド環境の間の窒素基交換の分析を紹介した.

結論:

  • 95GHz 2D-ELDORは,ナノ秒からマイクロ秒までの化学交換プロセスをナノ秒からマイクロ秒までリアルタイムで調査するための強力な技術です.
  • この研究は,ESRにおける窒素酸化物のスピンラベルを用いた化学交換によるクロスピークの最初の観察と分析を確立している.
  • 開発された方法論は,様々な化学的および生物学的システムにおける分子ダイナミクスを研究するための新しい道を開きます.