Two Antioxidant Alkaloids from <i>Portulaca oleracea</i> L.

Abstract

Abstract Two alkaloids, oleraceins F and G, were isolated from Portulaca oleracea L., and their structures were determined as methyl (2 S )‐6‐[( β ‐ D ‐glucopyranosyl)oxy]‐2,3‐dihydro‐5‐hydroxy‐1‐[(2 E )‐3‐(4‐hydroxy‐3‐methoxyphenyl)prop‐2‐enoyl]‐1 H ‐indole‐2‐carboxylate and methyl (2 S )‐6‐[( β ‐ D ‐glucopyranosyl)oxy]‐2,3‐dihydro‐5‐hydroxy‐1‐[(2 E )‐3‐(4‐hydroxyphenyl)prop‐2‐enoyl]‐1 H ‐indole‐2‐carboxylate, based on their spectroscopic data. Oleraceins F and G exhibited scavenging activity against 1,1‐diphenyl‐2‐picrylhydrazyl (DPPH) radical, with EC 50 values of 21.00 and 37.69 μ M , respectively.