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Updated: Jun 21, 2026
High-resolution Tandem Mass Spectrometry for Studying Chemical Constituents of Gynura bicolor DC
Published on: February 2, 2024
[Studies on chemical constituents from herbs of Usnea longissima]
Jie Feng1, Xiuwei Yang, Siduo Su
1State Key Laboratory of Natural and Biomimetic Drugs, Peking University, Beijing 100191, China.
Objective:
To study the chemical constituents of Usnea longissima.
Method:
The compounds were isolated and purified by the methods of solvent extraction and chromatographic technique, and their structures were identified on the basis of the analysis of spectral data or comparison with those of authentic sample.
Result:
Thirteen compounds were obtained and identified as ethyl hematommate (1), friedelin (2), beta-amyrin (3), beta-sitosterol (4), methyl-2,4-dihydroxy-3,6-dimethylbenzoate (5), barbatinic acid (6), zeorin (7), ethyl orsellinate (8), 3beta-hydroxy-glutin-5-ene (9), oleanolic acid (10), (+)-usnic acid (11), methylorsellinate (12), and 4-methyl-2,6-dihydroxy-benzaldehyde (13).
Conclusion:
Compounds 2, 3, 5, and 8-10 were isolated from this genus for the first time, and compounds 1,4 were obtained from this plant for the first time.