A new homoisoflavone from Portulaca oleracea L. and its antioxidant activity. Issue 24 (17th December 2019) - Yang, Xu
Abstract: A new compound was identified as 3-(2-hydroxybenzyl)-5, 7-dimethoxy-4 H -chromen-4-one (or 2′-dihydroxy-5, 7-dimethoxy-homoisoflavone), oleracone F (1 ), together with p -hydroxy ethyl cinnamate (2 ) and 4-hydroxy-3-methoxy ethyl cinnamate (3 ) isolated from the Portulaca oleracea L. for the first time and six known compounds, salicylic acid (4 ), β -carboline-3-carboxylic acid (5 ), aurantiamide (6 ), portulacanone A (7 ), B (8 ) and C (9 ) . Their structures were determined using spectroscopic methods, including one- and two-dimensional nuclear magnetic resonance and high-resolution electrospray ionization time-of-flight mass spectrometry. Notably, oleracone F (1 ) presented scavenging activity in 1, 1-diphenyl-2-picryl-hydrazyl (DPPH) radical quenching assay, with IC50 value of 17.78 μM. Abstract :