Composition, antioxidant and antimicrobial activities of volatile oils from Lantana camara Linn

Lantana camara Linn (Verbanaceae) is an ornamental plant which has become invasive in the tropical parts of the world. The volatile oils from the root, stem, leaves, and flowers of the plant were obtained by hydrodistillation and analysed by gas chromatography–mass spectrometry (GC-MS). The antioxidant and antimicrobial activities of the volatile oils were investigated by Hydrogen-Peroxide radical-scavenging assay, and broth microdilution method, respectively. The yield (v/w) of the volatile oils of the root, stem, leaves, and flowers of Lantana camara L are 0.54%, 0.50%, 0.98%, and 3.88% respectively. A total of 28, 42, 28, and 34 constituents were identified in the root, stem, leaves, and flowers EOs corresponding to 97.63%, 99.98%, 99.97%, and 98.30% of the volatile oil respectively. Eucalyptol (30.83%, root), Dibutyl phthalate (9.65%, stem), Eucalyptol (35.45%, leaves), and Caryophyllene (19.33%, flower) were the most abundant components identified in the volatile oils. Lantana camara L. volatile oils showed hydroxyl radical scavenging activities (51.9 - 67.3%) at a concentration of 33 to 8% while the leaves' volatile oils have the highest scavenging effect at the three concentrations. The volatile oils displayed broad-spectrum antimicrobial activity against the organisms tested. Keywords: Lantana camara L., antioxidant, antimicrobial, Eucalyptol.