Lignans from Bupleurum marginatum and their antioxidant activity

Area of Science:

• Natural Product Chemistry
• Phytochemistry
• Medicinal Chemistry

Background:

• Bupleurum species are traditionally used in herbal medicine.
• Lignans are a class of phenolic compounds with diverse biological activities.
• Aryltetralin lignans are a subclass with potential pharmacological relevance.

Purpose of the Study:

• To isolate and characterize novel and known compounds from Bupleurum marginatum.
• To evaluate the antioxidant properties of the isolated compounds.
• To identify potential bioactive compounds for further investigation.

Main Methods:

• Isolation of compounds using chromatographic techniques.
• Structure elucidation using 1D and 2D NMR spectroscopy, HRESIMS, and ECD data analysis.
• Evaluation of DPPH radical scavenging activity using spectrophotometric assays.

Main Results:

• A new aryltetralin lignan, bupleroid A (1), was identified.
• Ten known lignan analogues (2-11) were isolated and characterized.
• Compound 6 demonstrated significant DPPH radical scavenging activity at 50 μM concentration.

Conclusions:

• Bupleurum marginatum is a source of diverse aryltetralin lignans.
• Bupleroid A is a novel compound with potential antioxidant properties.
• Compound 6 exhibits notable antioxidant capacity, warranting further research.