相关实验视频

Updated: Jan 16, 2026

Quantitative 31P NMR Analysis of Lignins and Tannins
05:57

Quantitative 31P NMR Analysis of Lignins and Tannins

Published on: August 2, 2021

14.5K

使用H-qNMR优化从瓜叶中提取乌尔索酸

Wen-Ya Lu1, Meng-Ting Wang1, An-Ya Yang1

  • 1College of New Energy Materials and Chemistry, Leshan Normal University, Leshan 614000, China. songjh12@163.com.

Analytical methods : advancing methods and applications
|September 30, 2025
PubMed
概括

一种新的定量质子核磁共振 (1H-qNMR) 方法快速量化了洛卡叶中的乌尔索酸 (UA). 这种技术还优化了提取,实现了比传统方法更高的纯度和产量.

更多相关视频

A Simple Fractionated Extraction Method for the Comprehensive Analysis of Metabolites, Lipids, and Proteins from a Single Sample11:17

A Simple Fractionated Extraction Method for the Comprehensive Analysis of Metabolites, Lipids, and Proteins from a Single Sample

Published on: June 1, 2017

36.5K
Improved UPLC-UV Method for the Quantification of Vitamin C in Lettuce Varieties Lactuca sativa L. and Crop Wild Relatives Lactuca spp.10:22

Improved UPLC-UV Method for the Quantification of Vitamin C in Lettuce Varieties Lactuca sativa L. and Crop Wild Relatives Lactuca spp.

Published on: June 30, 2020

14.3K

相关概念视频

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...
1.4K
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.
6.2K