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Updated: Jan 8, 2026

Preparation of Fungal and Plant Materials for Structural Elucidation Using Dynamic Nuclear Polarization Solid-State NMR
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Preparation of Fungal and Plant Materials for Structural Elucidation Using Dynamic Nuclear Polarization Solid-State NMR

Published on: February 12, 2019

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对Chroman-6-olα-和β-O-Glucosides的综合实验和理论研究:动态溶液NMR,固态NMR,单晶X射线衍射和密度函数理论计算

Piotr Wałejko1, Łukasz Szeleszczuk2, Aneta Baj1

  • 1Faculty of Chemistry, University of Bialystok, Białystok, Poland.

ChemPlusChem
|December 13, 2025
PubMed
概括

这项研究研究了chromanyl glucosides,维生素E前药物,揭示了异常物之间的显著固态差异. 计算和实验方法表明α-anomer表现出分子乱,暗示了晶体中的多个稳定构造.

关键词:
2,2,5,7,8 - 五甲基--六 - .克罗曼尼尔葡萄糖化物交叉极化魔力角度旋转13C NMR 的交叉极化魔力角度旋转13C NMR 的交叉极化魔力角度旋转13C NMR 的交叉极化魔力角度旋转13C NMR 的交叉极化魔力角度旋转密度函数理论密度函数理论动态NMR光谱学 动态NMR光谱学

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Biochemical and Structural Characterization of the Carbohydrate Transport Substrate-binding-protein SP009208:53

Biochemical and Structural Characterization of the Carbohydrate Transport Substrate-binding-protein SP0092

Published on: October 2, 2017

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Sequencing of Plant Wall Heteroxylans Using Enzymic, Chemical Methylation and Physical Mass Spectrometry, Nuclear Magnetic Resonance Techniques11:49

Sequencing of Plant Wall Heteroxylans Using Enzymic, Chemical Methylation and Physical Mass Spectrometry, Nuclear Magnetic Resonance Techniques

Published on: March 24, 2016

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相关概念视频

Experimental Determination of Chemical Formula02:37

Experimental Determination of Chemical Formula

The elemental makeup of a compound defines its chemical identity, and chemical formulas are the most concise way of representing this elemental makeup. When a compound’s formula is unknown, measuring the mass of its constituent elements is often the first step in determining the formula experimentally.
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X-ray Diffraction of Biological Samples01:10

X-ray Diffraction of Biological Samples

X-ray diffraction or XRD is an analytical tool that utilizes X-rays to study ordered structures such as crystalline organic and inorganic samples, polycrystalline materials, proteins, carbohydrates, and drugs.
According to Bragg's law, when X-rays strike the sample positioned on a stage, the rays are  scattered by the electron clouds around the sample atoms. The  X-ray diffraction or scattering is caused by constructive interference of the X-ray waves that reflect off the internal...
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¹H NMR: Complex Splitting01:13

¹H NMR: Complex Splitting

A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied...
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Chemical Shift: Internal References and Solvent Effects01:17

Chemical Shift: Internal References and Solvent Effects

In an NMR sample, precise measurement of the absolute absorption frequencies of nuclei is difficult. A standard internal reference compound is added, and the frequency difference between the reference signal and sample signals is measured.
The internal reference compound generally used in NMR spectroscopy is tetramethylsilane (TMS). TMS is preferred because it is chemically inert, soluble in NMR solvents, and easily removable. Also, the highly shielded methyl protons in TMS yield an intense...
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