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Related Concept Videos

Mass Spectrometry: Aromatic Compound Fragmentation01:23

Mass Spectrometry: Aromatic Compound Fragmentation

Upon ionization, aromatic compounds generate a molecular ion that is observed as a prominent peak in their mass spectra. For example, the molecular ion peak for benzene appears at a mass-to-charge ratio of 78, while toluene is observed at a mass-to-charge ratio of 92. The molecular ion benzene is highly stable and does not readily undergo further fragmentation due to the significant amount of energy required to disrupt the aromatic stability of the benzene ring. In contrast, the molecular ion...
UV–Vis Spectroscopy of Conjugated Systems01:32

UV–Vis Spectroscopy of Conjugated Systems

Organic compounds with conjugated double bonds show strong absorption features in the UV–visible region of the electromagnetic spectrum attributed to π → π* electronic excitations. Generally, a UV–vis absorption spectrum is recorded as a plot of absorbance vs wavelength. The wavelength of maximum absorbance, which manifests as a peak in the absorption spectrum, is denoted as λmax.
One of the factors influencing λmax is the extent of conjugation in the...
Atomic Fluorescence Spectroscopy01:29

Atomic Fluorescence Spectroscopy

Atomic fluorescence spectroscopy (AFS) is an analytical technique that involves the electronic transitions of atoms in a flame, furnace, or plasma being excited by electromagnetic (EM) radiation. When these atoms absorb energy, they become excited and subsequently release energy as they return to their original state. This emitted light, or "fluorescence," is observed at a right angle to the incident beam. Both absorption and emission processes transpire at distinct wavelengths, which are...
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. Consider...
Diffusion on Chromatography Columns01:07

Diffusion on Chromatography Columns

In column chromatography, when an analyte is introduced as a narrow band at the top of the column, the solutes begin to separate and broaden, developing a Gaussian profile. This broadening occurs due to various factors, such as longitudinal diffusion.
Longitudinal diffusion occurs when the solute molecules in the mobile phase diffuse from the more concentrated center of the chromatographic band to the more dilute regions on either side, both towards and against the flow direction. This...

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Biosynthesis of a Flavonol from a Flavanone by Establishing a One-pot Bienzymatic Cascade
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Published on: August 14, 2019

Flavonoid mixture analysis by matrix-assisted diffusion-ordered spectroscopy.

Julia Cassani1, Mathias Nilsson, Gareth A Morris

  • 1School of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom. cassani@correo.xoc.uam.mx

Journal of Natural Products
|January 27, 2012
PubMed
Summary
This summary is machine-generated.

Structural similarity makes analyzing flavonoid mixtures difficult. A new matrix-assisted diffusion-ordered spectroscopy (DOSY) method uses differential chemical interactions to resolve these complex natural product mixtures.

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Last Updated: May 25, 2026

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Area of Science:

  • Analytical Chemistry
  • Natural Product Chemistry
  • Spectroscopy

Background:

  • Flavonoids, common in natural products, possess similar structures, complicating their analysis in mixtures.
  • Nuclear Magnetic Resonance (NMR) methods, particularly diffusion-ordered spectroscopy (DOSY), face challenges in separating structurally similar compounds due to peak overlap and similar hydrodynamic radii.

Purpose of the Study:

  • To develop a novel approach for resolving complex flavonoid mixtures.
  • To overcome the limitations of standard DOSY for analyzing structurally similar natural products.

Main Methods:

  • Utilized a matrix-assisted diffusion-ordered spectroscopy (DOSY) technique.
  • Employed micellar sodium dodecyl sulfate as a slow-diffusion matrix.
  • Exploited differential chemical interactions between flavonoids and the matrix for separation.

Main Results:

  • Successfully resolved signals from structurally similar flavonoids in mixed solvents.
  • Demonstrated the effectiveness of matrix-assisted DOSY in enhancing separation.
  • Overcame limitations of traditional DOSY for complex flavonoid mixtures.

Conclusions:

  • Matrix-assisted DOSY provides a powerful strategy for analyzing challenging flavonoid mixtures.
  • This method enhances the capability of NMR spectroscopy for natural product characterization.
  • Differential interactions with a matrix are key to resolving similar compounds.