CHEMISTRY COMPOSITION AND ANTIBACTERIAL ACTIVITY OF THE ESSENTIAL OILS OF Citrus paradisi, Juglans neotropica Diels, Schinus molle Y Tagetes elliptica SMITH

La composición química y el efecto antibacteriano de los aceites esenciales de Citrus paradisi, Juglans neotropica Diels, Schinus molle L. y Tagetes elliptica Smith) fueron determinados por cromatografía de gases/espectrometría de masas (CG/EM) y microdilución en placa respectivamente. En Citrus paradisi, se encontraron 21 componentes, siendo los principales el D-Limoneno (83,45%), octanal (8,68%) y β-mirceno (2,48%); en Juglans neotropica Diels se encontraron 36 componentes, siendo los principales el α-pineno (39,88%), cariofileno (27,66%) y β-pineno (11,00%); en Schinus molle se encontraron 37 componentes, siendo los principales α-felandreno (19,59%), canfeno (19,10%) y α–pineno (16,56%); y en Tagetes elliptica Smith se encontraron 33 componentes, siendo los mayoritarios β-mirceno (63,49%), cis-lanalool óxido (10,07%) y 2-tujeno (7,77%). Las concentraciones mínimas inhibitorias (CMIs) para los aceites esenciales de Citrus paradisi, Juglans neotropica Diels, Schinus molle L. y Tagetes elliptica Smith fueron menores a 2,5 μL/mL para Staphylococcus aureus, y para Staphylococcus epidermidis fueron menores de 5 μL/mL, con excepción de Juglans neotropica Diels que fue > 40 μL/mL; y todos los aceites fueron inactivos contra Pseudomonas aeruginosa. Los resultados encontrados corroboran el gran potencial antibacteriano de los aceites esenciales estudiados.The chemical composition and the antibacterial effect of the essential oils of Citrus paradisi, Juglans neotropica Diels, Schinus molle L. and Tagetes elliptica Smith) were determinided for gas chromatography/Mass spectrometry (GC/MS) and plate microdilution respectively were studied. In Citrus paradisi, 21 components were found, the main ones being D-Limonene (83,45%), octanal (8,68%) and β-myrcene (2,48%); in Juglans neotropica Diels 36 components were found, the main ones being α-pinene (39,88%), caryophylene (27,66%) and β-pinene (11,00%); 37 components were found in Schinus molle, the main α-phelandrene (19,59%), camphene (19,10%) and α-pinene (16,56%); and in Tagetes elliptica Smith found 33 components, with the majority being β-mircene (63,49%), cis-lanalool oxide (10,07%) and 2-tujene (7,77%). The minimum inhibitory concentration (MIC) for the essential oils of Citrus paradisi, Juglans neotropica Diels, Schinus molle L. and Tagetes elliptica Smith were less than 2.5 μL/mL for Staphylococcus aureus, and for Staphylococcus epidermidis were less than 5 μL/mL, with the exception of Juglans neotropica Diels which was > 40 μL/mL; and all the oils were inactive against Pseudomonas aeruginosa. The results found corroborate the great antibacterial potential of the essential oils studied