High-power ultrasonication-assisted extraction of soybean isoflavones and effect of toasting

► Research evaluated the high-power sonication for soybean isoflavones. ► Acetonitrile based solvent system was better suited than ethanol-based. ► Total genistein recovery increased with sonication, but total phenolics an antioxidant capacity decreased. ► Toasting at 150 °C helped recover higher total phenolics with sonication.