Bioactive biphenyl derivatives from Garcinia nujiangensis and structural revision

Area of Science:

• Natural Product Chemistry
• Medicinal Chemistry
• Pharmacology

Background:

• The genus Garcinia is a rich source of bioactive natural products.
• Biphenyl derivatives possess diverse pharmacological activities.
• Exploring new compounds from Garcinia species can lead to novel therapeutic agents.

Purpose of the Study:

• To isolate and characterize biphenyl derivatives from Garcinia nujiangensis.
• To evaluate the alpha-glucosidase inhibitory and lipid-lowering effects of these compounds.
• To identify potential anti-diabetic and lipid-lowering drug leads.

Main Methods:

• Isolation and purification of compounds using chromatographic techniques.
• Structure elucidation via comprehensive spectroscopic analysis (NMR, MS) and X-ray crystallography.
• In vitro assays for alpha-glucosidase inhibition and lipid-lowering activity in OA-induced HepG2 cells.

Main Results:

• Twelve biphenyl derivatives, including ten new compounds, were isolated and identified.
• Five compounds (2, 6, 9, 10, 11) showed significant alpha-glucosidase inhibition, with compound 10 being the most potent (IC50 = 37.80 μg/mL).
• Six compounds (1, 2, 6, 7, 9, 10) exhibited notable lipid-lowering effects, surpassing the positive control atorvastatin.

Conclusions:

• The study expands the known structural diversity of biphenyls from the Garcinia genus.
• Compound 10 is a highly potent alpha-glucosidase inhibitor, suggesting potential for anti-diabetic applications.
• Several isolated compounds demonstrate promising lipid-lowering properties, warranting further investigation for cardiovascular health.