Antioxidant activity and rosmarinic acid content of ultrasound-assisted ethanolic extracts of medicinal plants

In this study, we describe a simple laboratory procedure using an ultrasound-assisted ethanolic extraction from six medicinal plants. This potential didactic approach showed to be a rapid and effective process on preserving the antioxidant activity and rosmarinic acid content. The HPLC system was used to evaluate the ability to assess rosmarinic acid content.