The volatile constituents from leaves of Callistemon viminalis (Gaertn.) G. Don grown in Colombia was studied by GC and GC-MS. Eighty-nine compounds were identified, of which the most prominent were 1,8-cineole (39.4 %), α-pinene (8.9 %), α-phellandrene (8.6 %) and α-terpineol (6.1 %). The in vitro antibacterial activity of the essential oil was studied against seven bacteria strains using the disc diffusion method. The essential oil exhibited strong zone of inhibitions against some bacteria such as Staphylococcus aureus (>20 mm), Listeria innocua (14 mm), and Enterobacter sakazakii (18 mm).

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The chemical composition of the volatile compounds from the leaves of Lantana canescens Kunth (Verbenaceae) and L. lopez-palacii Moldenke grown in Colombia were analyzed by GC and GC/MS. One hundred and thirty-nine volatile compounds were identified in L. canescens, of which the major ones were β-caryophyllene (13.5%), germacrene D (10.3%) and 1-octen-3-ol (8.4%). In the oil obtained from L. lopez-palacii, eighty-three compounds were identified, of which the most prominent were 1-octen-3-ol (24.4%) and β-caryophyllene (15.2%). The in vitro antibacterial activity of the L. lopez-palacii essential oil was studied against three bacterial strains using the disc diffusion method. No antimicrobial activity was found against Escherichia coli, Enterobacter sakazakii and Listeria monocytogenes.

The essential oil from fruits of Retrophyllum rospigliosii (Pilger) C.N. Page grown in Colombia was analyzed by GC and GC/MS. Ninety-one compounds were identified, of which the most prominent were limonene (37.7%) and α-pinene (16.3%). The in vitro antibacterial activity of the essential oil was studied against seven bacterial strains using the disc diffusion method. The strongest activity of the oil was against the Gram-positive bacterium Bacillus cereus.