plants Article Selective BuChE Inhibitory Activity, Chemical Composition, and Enantiomeric Content of the Essential Oil from Salvia leucantha Cav. Collected in Ecuador Gabriela Villalta 1 , Melissa Salinas 1 , James Calva 1 , Nicole Bec 2 , Christian Larroque 2, Giovanni Vidari 3 and Chabaco Armijos 1,* 1 Departamento de Química, Universidad Técnica Particular de Loja, 1101608 Loja, Ecuador;
[email protected] (G.V.);
[email protected] (M.S.);
[email protected] (J.C.) 2 Institute for Regenerative Medicine and Biotherapy (IRMB), Université de Montpellier, INSERM, CHU Montpellier, 34295 Montpellier, France;
[email protected] (N.B.);
[email protected] (C.L.) 3 Medical Analysis Department, Faculty of Science, Tishk International University, Erbil 44001, Iraq;
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[email protected] Abstract: The essential oil (EO) of Salvia leucantha Cav. was isolated by steam distillation of the aerial parts collected in the South of Ecuador. Its physical properties were evaluated and the chemical composition of the oil was determined by GC-MS and GC-FID analyses using two chro- matographic columns, DB-5ms and HP-INNOWax. Six major compounds were identified, namely, the sesquiterpenes 6.9-guaiadiene (19.14%), (E)-caryophyllene (16.80%), germacrene D (10.22%), Citation: Villalta, G.; Salinas, M.; (E)-β-farnesene (10.00%), and bicyclogermacrene (7.52%), and the monoterpenoid bornyl acetate Calva, J.; Bec, N.; Larroque, C.; Vidari, (14.74%). Furthermore, four pairs of enantiomers were determined by enantioselective GC-MS of G.; Armijos, C. Selective BuChE the essential oil. (−)-germacrene D and (+)-α-pinene showed the highest enantiomeric excess (ee%). Inhibitory Activity, Chemical Composition, and Enantiomeric In an in vitro assay, the essential oil demonstrated an interesting inhibitory activity of the enzyme Content of the Essential Oil from butyrylcholinesterase (BuChE), with an IC50 = 32.60 µg/mL, which is the highest determined for Salvia leucantha Cav.