Demirci, FatihKaradağ, Ayşe EsraBiltekin, Sevde NurDemirci, Betül2021-09-162021-09-162022Demirci, F., Karadağ, A. E., Biltekin, S. N. ve Demirci, B. (2022). In vitro ACE2 and 5-LOX inhibition of rosmarinus officinalis l. essential oil and its major component 1,8-cineole. Records of Natural Products, 16(2), 194-199. https://dx.doi.org/10.25135/rnp.265.21.05.20801307-6167https://dx.doi.org/10.25135/rnp.265.21.05.2080https://hdl.handle.net/20.500.12511/8189In this present study, Rosmarinus officinalis L. essential oil, and its major component 1,8-cineole was evaluated in vitro for angiotensin converting enzyme 2 (ACE2), as well as for 5-lipoxygenase (5-LOX) enzyme inhibitory activity. The essential oil composition was confirmed both by GC-FID and GC/MS, where 1,8-cineole (62.7%), alpha-pinene (12.6 %), and camphor (8.3 %) were identified as the main constituents. Activity studies were performed at concentrations of 20 mu g/mL for essential oil, and 5 mu g/mL for the major compound 1,8-cineole, which were compared experimentally with standards. The essential oil was evaluated using a fluorometric multiplate based enzyme inhibition kit, where the ACE2 inhibition of Rosmarinus aetheroleum was 20%, while the 5-LOX inhibition was observed as 81.1%, respectively. In addition, the major constituent 1,8-cineole also showed remarkable ACE2 inhibition with 89.2%, and 5-LOX inhibition with 37.2%, respectively. As a result, the cineole chemotype rosemary essential oil, and its major constituent 1,8-cineol may have antiviral potential applications against coronaviruses due to ACE2 enzyme inhibition with anti-inflammatory effects. Further in vivo studies are needed to confirm the efficacy of essential oils and their constituents.eninfo:eu-repo/semantics/openAccessRosmarinus Officinalis L.Essential OilACE25-LOX1,8-CineoleArticle16219419910.25135/rnp.265.21.05.2080Q3523943Q2