Antioxidant properties and essential oil composition of Calamintha grandiflora L.

► Essential oil and antioxidant potential of Calamintha grandiflora evaluated. ► Isomenthone, neo-isomenthol, pulegone and isomenthol were major volatile constituents. ► Hydrodistillation residues were extracted with acetone, methanol and ethanol. ► Extracts possessed DPPH, ABTS radical scavenging and retarded oil auto-oxidation. ► Rosmarinic and salvianolic C acids were the main antioxidants in C. grandiflora.