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Updated: Jun 20, 2026

Biosynthesis of a Flavonol from a Flavanone by Establishing a One-pot Bienzymatic Cascade
Published on: August 14, 2019
[Flavonoids in leaves of Alstonia scholaris]
Tingting Hui1, Yun Sun, Liping Zhu
1School of Pharmacy, Yunnan College of Traditonal Chinese Medicine, Kunming 650200, China.
Objective:
To investigate the flavonoids in leaves of Alstonia scholaris, an ethno-remedy of Dai People in Yunnan.
Method:
The chemical constituents were isolated and purified by column chromatography. Their structures were elucidated on the basis of spectroscopic evidences and physicochemical properties.
Result:
Eight flavonoids were isolated and identified as kaempferol (1), quercetin (2), isorhamnetin (3), kaempferol-3-0-beta-D-galactopyranoside (4), quercetin-3-0-beta-D-galactopyranoside (5), isorhamnetin-3-0-beta-D-galactopyranoside (6), kaempferol-3-0-beta-D-xylopyranosyl-( 2-1)-0-beta-D-galactopyranoside (7) ,quercetin-3-0-beta-D-xylopyranosyl-( 2-1)-0-beta-D-galactopyranoside (8).
Conclusion:
Flavonoids 1-7 were isolated from A. scholaris for the first time.
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