A bioassay-oriented approach led to the isolation of 11 compounds, including three new natural flavonoids, (2S)-isookanin 7-O-α-L-arabinopyranoside (1), (2S)-isookanin 7-O-(2′′-acetyl)-α-L-arabinopyranoside (2), and luteolin 7-O-β-D-glucopyranosyl-(1→6)-β-D-galactopyranoside (6), from Bidens humilis aerial parts. Their structures were determined via spectroscopic analyses including two-dimensional nuclear magnetic resonance. The antioxidant activity of all compounds was also tested by three different assays. The Relative Antioxidant Capacity Index (RACI) is applied herein, from the perspective of statistics, by integrating the antioxidant capacity data determined by these chemical methods
Antioxidant and Free Radical Scavenging Activity of Phenolics from Bidens humilis
DE TOMMASI, Nunziatina;DAL PIAZ, FABRIZIO;
2015-01-01
Abstract
A bioassay-oriented approach led to the isolation of 11 compounds, including three new natural flavonoids, (2S)-isookanin 7-O-α-L-arabinopyranoside (1), (2S)-isookanin 7-O-(2′′-acetyl)-α-L-arabinopyranoside (2), and luteolin 7-O-β-D-glucopyranosyl-(1→6)-β-D-galactopyranoside (6), from Bidens humilis aerial parts. Their structures were determined via spectroscopic analyses including two-dimensional nuclear magnetic resonance. The antioxidant activity of all compounds was also tested by three different assays. The Relative Antioxidant Capacity Index (RACI) is applied herein, from the perspective of statistics, by integrating the antioxidant capacity data determined by these chemical methodsI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
