Evaluation of antibacterial and antioxidant properties of Lavandula officinalis extracts obtained by ultrasound

Abstract

Lavandula officinalis is a Mediterranean plant to which antimicrobial and antioxidant properties are attributed. The objective of the research was to evaluate the chemical composition, antioxidant and antibacterial activity of dried leaves of Lavandula officinalis. For the extraction of bioactive compounds, ultrasound was used, which is an environmentally friendly technique, where a yield percentage of 15.51% was obtained. The chemical composition was evaluated by high-performance liquid chromatography coupled to mass (HPLC-MS), where it was demonstrated that it was possible to extract compounds such as rosmarinic acid, medioresinol, which are the main compounds to which the properties of this plant are attributed. The antioxidant evaluation was carried out by DPPH, ABTS, and FRAP, where inhibition percentages of 60.99 %, 79.86 %, and 0.07 mg Trolox/mL, respectively, were found. The antibacterial activity against Staphylococcus aureus and Escherichia coli was evaluated by the agar diffusion method, finding inhibition halos of 10 mm and 9 mm, respectively. This demonstrates that the bioactive compounds contained in Lavandula officinalis are an alternative to the synthetic compounds currently used in the cosmetic, food, and pharmaceutical industries due to the properties they possess.