Official websites use. Share sensitive information only on official, secure websites. This study was carried out to characterize the chemical composition of the essential oils from seven Eucalyptus species E.
The antibiofilm activity was studied against both Gram-negative Pseudomonas aeruginosa, Escherichia coli and Acinetobacter baumannii and Gram-positive Staphylococcus aureus and Listeria monocytogenes bacteria. The inhibition of biofilm formation and its metabolism was determined at different times. Eucalyptol was the most abundant component in all essential oils studied ranging from The action of all essential oils proved to be highly effective in inhibiting the bacterial adhesion process of the five strains considered.
In light of these results, these essential oils could have potential applications both in the agricultural and health fields. Keywords: essential oil, Eucalyptus , phytotoxic activity, antibiofilm activity. The Eucalyptus genus Myrtaceae is composed of evergreen aromatic flowering trees and comprises about species. It is a native to Australia although Eucalyptus species are now distributed in almost all parts of the world [ 1 ].
Different parts of the plant have been used to produce essential oils EOs , but in the leaves these oils were most plentiful [ 2 ]. The EOs from Eucalyptus species rich in eucalyptol have traditionally been utilized as disinfectants, insect repellents, febrifuges and to treat respiratory illnesses [ 3 ]. Nowadays, they are used in many pharmaceutical and cosmetics industries [ 2 ]. Moreover, the identification of bioactive allelochemicals in several Eucalyptus species EOs developed research towards potential natural herbicidal compounds for weed management [ 4 , 5 , 6 , 7 ].
However, beyond human and environmental toxicity, many weed plants are developing resistance to classical synthetic herbicide; therefore, it appears necessary to increase the study of new natural herbicidal substances [ 9 ]. On the other hand, biofilm formation and drug resistance found in both Gram-negative and Gram-positive bacteria represent problems for human health [ 10 , 11 ]. Several studies have demonstrated the antimicrobial properties of the EOs from Eucalyptus species [ 12 , 13 ] but few studies investigated their anti-biofilm activity [ 14 ].
