Related Experiment Video
Updated: Aug 15, 2026

High-resolution Tandem Mass Spectrometry for Studying Chemical Constituents of Gynura bicolor DC
Published on: February 2, 2024
[The chemical constituents of Knoxia valerianoides]
1Institute of Pharmacology and Toxicology, Academy of Military Medical Sciences, Beijing 100850, China.
Aim:
To study chemical constituents of Knoxia valerianoides Thorel et Pitard.
Methods:
Chromatographic methods were used for the isolation and purification. Structures was elucidated on the basis of chemical analysis and spectroscopic data.
Results:
Two anthraquinone were isolated from Knoxia valerianoides Thorel et Pitard and identified as 1,3,5-trihydroxy-2-ethoxymethyl-6-methoxyl-anthraquinone (I) and 1,3-dihydroxy-2-ethoxymethyl-anthraquinone (II).
Conclusion:
The compound I was found to be a novel anthraquinone constituent and II was isolated from Knoxia valerianoides Thorel et Pitard for the first time.
Related Concept Videos
Spasmolytic Agents: Chemical Classification
A major class of centrally acting spasmolytics is the α2-agonist, such as tizanidine. These drugs bind to α2-adrenoceptors, inhibiting the release of the excitatory neurotransmitter glutamate. They also promote...
Aldehydes and Ketones with HCN: Cyanohydrin Formation Overview
Tonicity in Plants
Tonicity in Plants
Tonicity
Tonicity describes the capacity of a cell to lose or gain water depending on the solute...
Structures of Aldehydes and Ketones
In aldehydes (Figures 1a and 1b), the carbonyl...
Oxidation of Phenols to Quinones
o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox property is crucial in...