Five new limonoids isolated from Walsura robusta.

Area of Science:

• Natural Products Chemistry
• Medicinal Chemistry
• Pharmacology

Background:

• Walsura robusta is a plant species known to contain bioactive compounds.
• Limonoids, a class of terpenoids, often exhibit diverse biological activities, including anticancer properties.
• The exploration of novel limonoids from natural sources is crucial for drug discovery.

Purpose of the Study:

• To isolate and characterize new limonoids from the leaves of Walsura robusta.
• To evaluate the cytotoxic activity of the isolated compounds against various human cancer cell lines.

Main Methods:

• Phytochemical investigation of Walsura robusta leaves.
• Structure elucidation of isolated compounds using Nuclear Magnetic Resonance (NMR) and Mass Spectrometry (MS) data.
• Determination of absolute configuration for a known compound via X-ray diffraction.
• In vitro cytotoxicity assays against HL-60, SMMC-7721, A-549, MCF-7, and SW480 cancer cell lines.

Main Results:

• Five new toosendanin limonoids, named walsurobustones A-D (1-4), and one new furan ring degraded limonoid, walsurobustone E (5), were isolated.
• One known compound, toonapubesic acid B (6), was also identified.
• Compounds 1-6 displayed notable cytotoxicity against the tested cancer cell lines.

Conclusions:

• The study successfully identified novel limonoids from Walsura robusta.
• The isolated compounds, including the new walsurobustones, possess significant anticancer potential.
• Further research into these limonoids may lead to the development of new cancer therapeutics.