Profiling the chlorogenic acids of <i>Rudbeckia hirta</i>, <i>Helianthus tuberosus</i>, <i>Carlina acaulis</i> and <i>Symphyotrichum novae‐angliae</i> leaves by LC‐MS<i>ⁿ</i>

Abstract

In this study, all the CGAs present in the leaves of Rudbeckia hirta, Helianthus tuberosus, Carlina acaulis and Symphyotrichum novae-angliae were identified qualitatively to their regioisomeric level without any purification or isolation, and assignment was based on their LC-MS(n) behaviour and the change in the intensity after the UV-irradiation. A series of CGAs common to these anti-viral herbal remedies was identified, which will in the future be selected for further detailed biological screening.