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A new biflavonoid from Aristolochia contorta
Li-Li Yu1, Rong Huang, Yu-Ping Lv
1Department of Chemistry, Yunnan Normal University, PR China.
Die Pharmazie
|November 2, 2005
Summary
A new biflavonoid, (+/-)-2"R,3"R-dihydro-3"-hydroxyamentoflavone, was isolated from Aristolochia contorta fruits. This discovery expands the known phytochemical profile of this plant species.
Area of Science:
- Phytochemistry
- Natural Product Chemistry
- Organic Chemistry
Background:
- Aristolochia contorta Bge is a plant species known for its diverse chemical constituents.
- Previous research has identified various compounds, including aristolochic acids, from this plant.
Purpose of the Study:
- To isolate and characterize novel compounds from the fruits of Aristolochia contorta Bge.
- To identify and confirm the structures of known compounds present in the plant extract.
Main Methods:
- Isolation of compounds using chromatographic techniques.
- Structure elucidation of the new biflavonoid using 1D and 2D Nuclear Magnetic Resonance (NMR) spectroscopy.
- High-resolution Electrospray Ionization Mass Spectrometry (HR-ESIMS) for molecular formula determination.
- Comparison of NMR data with literature values for identification of known compounds.
Main Results:
- A new biflavonoid, (+/-)-2"R,3"R-dihydro-3"-hydroxyamentoflavone, was successfully isolated and its structure determined.
- Known compounds including aristolochic acids IVa and VII, aristolactam-N-beta-D-glucopyanoside, aristoloctam Ia N-beta-D-glucopyanoside, pinitol, and daucosterol were identified.
- The structural determination of the new compound was confirmed through comprehensive spectral analysis.
Conclusions:
- The phytochemical investigation of Aristolochia contorta fruits led to the discovery of a novel biflavonoid.
- The study contributes to the understanding of the chemical diversity of Aristolochia species.
- The identified compounds can serve as a basis for further pharmacological or chemotaxonomic studies.