A new flavonol acylglycoside from the fruits of <i>Nitraria tangutorum</i> Bobr

Abstract

Phytochemical investigation on the ethanol extract of the fruits of <i>Nitraria tangutorum</i> Bobr. led to the isolation of a new flavonol acylglycoside tangutoside (<b>7</b>) and six known ones including <i>p</i>-formylphenol (<b>1</b>), 3-formylindole (<b>2</b>), rutin (<b>3</b>), prionitisid B (<b>4</b>), quercitrin (<b>5</b>) and flazin (<b>6</b>). Among them, compounds <b>2</b>, <b>4</b>, and <b>5</b> were isolated from <i>Nitraria tangutorum</i> Bobr. for the first time. Their structures were identified by spectroscopic methods and by comparison with data reported in the references. The compounds 3, 4, 5, and 7 were demonstrated to possess strong DPPH radical scavenging ability with IC₅₀ values of 31.45 μg/mL, 19.21 μg/mL, 59.30 μg/mL, and 44.54 μg/mL, respectively.