Abstract
The interest in finding natural antioxidants for use in food, drugs or cosmetic products has increased concerning the replacement of synthetic antioxidants due to their possible undesirable toxic effects on humans long-term exposed.Ethanolic extracts of Hypericum perforatum (Hypericaceae), Lavandula angustifolia (Lamiaceae), Malva sylvestris (Malvaceae), Melissa officinalis (Lamiaceae), Salvia officinalis (Lamiaceae), Rosmarinus officinalis (Lamiaceae) were obtained under sonication with a yield of 5.9%, 3.8%, 5.8%, 3.8%, 4.2% and 2.3% (w/w), respectively and their antioxidant activity assessed by the TLC-DPPH and DPPH assays. With exception of L. angustifolia and M. sylvestris extracts all the others showed antioxidant activity greater than 70% (at 0.1mg/mL).The HPLC analysis shows that all tested extracts contain rosmarinic acid and suggest that H. perforatum extract have the highest concentration (2.76mM) and M. sylvestris extract the lowest one (0.47mM).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.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
