Phenol constituents of Pachysandra terminalis and their antioxidant activity / 中国中药杂志

ABSTRACT

<p><b>OBJECTIVE</b>To study the phenol constituents from Pachysandra terminalis and their antioxidant activities.</p><p><b>METHOD</b>Constituent isolation and purification was carried by repeated column chromatography (silica gel, Toyopearl HW-40 and preparative HPLC), and their structures were elucidated on the basis of spectral data analysis. DPPH method was used to evaluate the free radical scavenging activity of the isolated compounds.</p><p><b>RESULT</b>Nine phenol compounds (1-9) were isolated and their structures were identified as follow p-hydroxybenzaldehyde (1), vanillin (2), 1-(4-hydroxy-3-methoxyphenyl) -ethanone (3), syringaldehyde (4), salicylic acid (5), p-hydroxybenzoic acid (6), ferulic acid (7), 2,3,4-trihydroxybenzoic acid (8), 3,4-dihydroxybenzoic acid (9). The isolated compounds showed obviously antioxidant activity. At the concentration of 50 micromol x L(-1), compounds 7-9 revealed DPPH free radical scavenging rates were 87.8%, 97.8% and 92%, respectively.</p><p><b>CONCLUSION</b>Compounds 1-9 were isolated from this genus for the first time. They showed the significant antioxidant activity.</p>