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Updated: Aug 21, 2026

High-resolution Tandem Mass Spectrometry for Studying Chemical Constituents of Gynura bicolor DC
Published on: February 2, 2024
[Studies on the chemical constituents of Knoxia corymbosa]
Yu-bo Wang1, Jing-feng Zhao, Gan-peng Li
1School of Pharmacy, Yunnan University, Kunming 650091, China.
Aim:
To study the chemical constituents of Knoxia corymbosa Willd.
Methods:
Chromatography was used to isolate and purify the chemical constituents, their structures were identified by spectral analysis.
Results:
Four flavonol glycosides were identified as quercetin-7-O-alpha-L-arabinosyl-3-O-beta-D-6"-acetylglucopyranoside (1), kaempferol-7-O-alpha-L-arabinosyl-3-O-beta-D-glucopyranoside (2), quercetin-3-O-beta-D-glucopyranoside (3), quercetin-3-O-beta-D-6"-acetylglucopyranoside (4).
Conclusion:
Compound 1 is a new flavonol glycoside. The other flavonol glycosides were isolated from Knoxia corymbosa Willd for the first time.
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