Isolation and Characterization of Phenolic Antioxidants from Plantago Herb

Abstract

Seven phenolic compounds, including a new phenylethanoid glycoside, were isolated from the ethyl acetate fraction of an aqueous ethanol extract of Plantago Herb (whole part of <em>Plantago asiatica</em> L.), which showed significant antioxidative activity. The new compound was characterized as 2-(3,4-dihydroxyphenyl)ethyl 3-<em>O</em>-β-D-allopyranosyl-6-<em>O</em>-caffeoyl-β-D-glucopyranoside on the basis of spectral and chemical evidence, and its antioxidant activity was comparable to that of tea catechins.

Keywords

• &lt;em&gt;Plantago asiatica&lt;/em&gt;
• Plantaginaceae
• phenylethanoid glycoside
• antioxidant
• oxygen radical absorbance capacity (ORAC)