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Highly Oxygenated Limonoids and Lignans from Phyllanthus flexuosus
Jian-Qiang Zhao1, Yan-Ming Wang1, Hong-Tao Zhu2
1State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, 650201 People's Republic of China ; University of Chinese Academy of Sciences, Beijing, 100049 People's Republic of China.
Two new limonoids from Phyllanthus flexuosus roots exhibit potent antifeedant properties against the beet army worm. These compounds also show moderate cytotoxicity against human esophagus cancer cells, indicating potential therapeutic applications.
Area of Science:
- Phytochemistry
- Natural Products Chemistry
- Organic Chemistry
Background:
- Phyllanthus flexuosus is a plant species known for its diverse chemical constituents.
- Limonoids and lignans are classes of natural products with a wide range of biological activities.
- Investigating the chemical diversity of medicinal plants can lead to the discovery of novel bioactive compounds.
Purpose of the Study:
- To isolate and characterize new chemical compounds from the roots of Phyllanthus flexuosus.
- To evaluate the biological activities of the isolated compounds, including antifeedant, antiviral, and cytotoxic effects.
- To contribute to the understanding of the phytochemical profile of Phyllanthus flexuosus.
Main Methods:
- Isolation of compounds using chromatographic techniques.
- Structure elucidation through detailed spectroscopic analysis (NMR, MS) and chemical methods.
- Biological activity screening, including antifeedant assays against Spodoptera exigua, anti-herpes simplex virus 1 assays, and cytotoxicity assays against ECA109 cancer cell line.
Main Results:
- Two new highly oxygenated limonoids, flexuosoids A (1) and B (2), and three new arylnaphthalene lignan glycosides, phyllanthusmins D-F (3-5), were identified.
- Flexuosoids A (1) and B (2) demonstrated significant antifeedant activity against Spodoptera exigua (EC50 = 25.1 and 17.3 μg/cm², respectively).
- Compounds 1, 2, and the known lignan glycoside phyllanthusmin C exhibited moderate cytotoxicity against the ECA109 human esophagus cancer cell line (IC50 = 11.5, 8.5, and 7.8 μM, respectively).
Conclusions:
- The roots of Phyllanthus flexuosus are a source of novel limonoids and lignan glycosides.
- The new limonoids, flexuosoids A and B, possess promising antifeedant properties.
- The identified compounds warrant further investigation for their potential as therapeutic agents, particularly in cancer treatment and pest control.
