Chemical Composition and Biological Activities of Rosemary Essential oil (Rosmarinus oficinalis L.) Collected in Dak Lak, Vietnam

Rosemary (Rosmarinus oficinalis L.) essential oil was analyzed using GC-MS, revealing 60 identified compounds. The major constituents include α-pinene (29.52%), eucalyptol (22.55%), verbenone (9.98%), and geraniol (5.62%). Rosemary essential oil exhibits strong antioxidant activity with an IC50 value of 12.44 µg/mL, determined by the DPPH method. However, it shows only weak antibacterial activity against E.coli, as evaluated by the disc diffusion method.