Separation of Rosmarinic Acid from Rosmarinus officinalis L. by Ultrasonic-Assisted Extraction Using Biocompatible Ionic Liquid as Additive

Rosmarinic acid (RA), a phenolic compound with excellent antioxidant properties, is mainly from rosemary leaves. In this study, several biocompatible ionic liquids (BILs) were proposed as the additive to enhance the extraction efficiency for ultrasonic-assisted extraction of RA from Rosmarinus officinalis L. using ethanol as the solvent