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相关概念视频

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

845
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.
845
2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)01:19

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

768
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...
768
2D NMR: Overview of Homonuclear Correlation Techniques01:16

2D NMR: Overview of Homonuclear Correlation Techniques

241
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...
241
¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

1.1K
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...
1.1K
2D NMR: Homonuclear Correlation Spectroscopy (COSY)01:06

2D NMR: Homonuclear Correlation Spectroscopy (COSY)

1.2K
Homonuclear correlation spectroscopy, or COSY, is a 2-dimensional NMR technique that provides information about coupled protons. Typically, the geminal and vicinal coupling are observed. For example, consider the COSY spectrum of ethyl acetate, where its 1D proton NMR spectrum is plotted along the vertical and horizontal axes with their corresponding chemical shift scale. Three spots on the diagonal corresponding to the three peaks in the 1D proton spectrum are called diagonal peaks. The COSY...
1.2K
¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

1.1K
When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
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化合物特定的1D1HNMR脉冲序列选择用于代谢学分析.

Upendra Singh1, Shuruq Alsuhaymi1, Ruba Al-Nemi1

  • 1Smart-Health Initiative (SHI) and Red Sea Research Center (RSRC), Division of Biological and Environmental Sciences and Engineering (BESE), King Abdullah University of Science and Technology (KAUST), Thuwal, Makkah 23955-6900, Saudi Arabia.

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概括

核磁共振 (NMR) 代谢学用于生物流体,植物和海洋样本的各种水抑制技术. 本研究评估了不同的1D质子NMR方法,以优化代谢物信号强度和光谱质量.

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科学领域:

  • 分析化学 分析化学
  • 生物化学 生物化学
  • 频谱学是一种光谱学.

背景情况:

  • 基于核磁共振 (NMR) 的代谢学对于分析医疗,植物和海洋样本等生物样本至关重要.
  • 一维 (1D) 1H NMR是一种标准技术,用于识别生物流体中的生物标志物.
  • 水性NMR溶液中的高水信号强度对光谱分析构成重大挑战.

研究的目的:

  • 评估不同抑制水的技术对NMR代谢学中的代谢物信号强度的影响.
  • 在不同样本类型中比较各种1D质子NMR方法的有效性.
  • 为代谢学研究提供关于每个抑制水的方法的优点和局限性的建议.

主要方法:

  • 研究了各种1D质子NMR抑制水的技术,包括卡尔-普尔塞尔-梅布姆-吉尔 (CPMG) 预设,NOESY,预设和激发雕塑.
  • 分析生物流体,植物和海洋样本以评估方法性能.
  • 评估了每个方法对常见检测代谢物的信号强度的影响.

主要成果:

  • 不同的抑制水的方法产生不同的信号强度的代谢物.
  • 1D预设和激发雕塑是有效的抑制水的技术.
  • CPMG预测有效地抑制了宏分子信号,并减少了光谱工件.

结论:

  • 方法选择显著影响NMR代谢学中的代谢物信号检测.
  • 了解每个压水技术的优点和弱点对于优化实验设计至关重要.
  • 提供了建议,以指导研究人员为各种样本类型选择合适的NMR方法.