Four new sesquiterpenoids from the aerial parts of Pogostemon cablin (Blanco.) Benth. and their hypoglycemic activity

Abstract

Four previously undescribed sesquiterpenoids (1-4), including two natural guaiane-type sesquiterpenoids (1-2), a rearranged guaiane-type sesquiterpenoid (3), and a norsesquiterpenoid (4), were isolated from the ethanol extract of the aerial parts of Pogostemon cablin (Blanco.) Benth. Their chemical structures were determined based on extensive spectroscopic data analysis, including UV, IR, NMR, HRESIMS, and CD spectroscopy. Compound 1 exhibited a good hypoglycemic activity with glucose uptake of 124.3% and 131.2% in myotubes, respectively, at the concentrations of 20 and 40 μM and showed no cytotoxicity. These findings provide a material basis for further research on P. cablin.

Keywords: Hypoglycemic activity; Pogostemon cablin (Blanco.) Benth.; Sesquiterpenoids.