Comparative Bioactivity Evaluation of Chemically Characterized Essential Oils Obtained from Different Aerial Parts of <i>Eucalyptus gunnii</i> Hook. f. (Myrtaceae)
Hocine Abbaci,
El-hafid Nabti,
Abdullah M. Al-Bekairi,
Soheir A. A. Hagras,
Mounir M. Salem-Bekhit,
Abdenour Adjaoud,
Hayat Ali Alzahrani,
Leila Bensidhoum,
Rawaf Alenazy,
Alessandra Piras,
Danilo Falconieri,
Silvia Porcedda,
Yacine Benguerba,
Karim Houali
Affiliations
Hocine Abbaci
Laboratoire de Maitrise des Energies Renouvelables, Faculté des Sciences de la Nature et de la Vie, Université de Bejaia, Bejaia 06000, Algeria
El-hafid Nabti
Laboratoire de Maitrise des Energies Renouvelables, Faculté des Sciences de la Nature et de la Vie, Université de Bejaia, Bejaia 06000, Algeria
Abdullah M. Al-Bekairi
Inaya Medical Colleges, Riyadh 11352, Saudi Arabia
Soheir A. A. Hagras
Department of Clinical Laboratory Sciences, Inaya Medical Colleges, Riyadh 11352, Saudi Arabia
Mounir M. Salem-Bekhit
Department of Pharmaceutics, College of Pharmacy, King Saud University, Riyadh 11451, Saudi Arabia
Abdenour Adjaoud
Département des Sciences Biologiques de l’Environnement, Faculté des Sciences de la Nature et de la Vie, Université de Bejaia, Bejaia 06000, Algeria
Hayat Ali Alzahrani
Department of Medical Laboratory Technology, Faculty of Applied Medical Sciences, Northern Border University, Arar 73211, Saudi Arabia
Leila Bensidhoum
Laboratoire de Maitrise des Energies Renouvelables, Faculté des Sciences de la Nature et de la Vie, Université de Bejaia, Bejaia 06000, Algeria
Rawaf Alenazy
Department of Medical Laboratory, College of Applied Medical Sciences-Shaqra, Shaqra University, Shaqra 11961, Saudi Arabia
Alessandra Piras
Department of Chemical and Geological Sciences, University of Cagliari, Cittadella Universitaria, 09042 Monserrato, Italy
Danilo Falconieri
Technical Institute “Michele Giua”, Via Montecassino, 09134 Cagliari, Italy
Silvia Porcedda
Department of Chemical and Geological Sciences, University of Cagliari, Cittadella Universitaria, 09042 Monserrato, Italy
Yacine Benguerba
Laboratoire de Biopharmacie Et Pharmacotechnie (LBPT), Université Ferhat ABBAS Sétif-1, Sétif 19000, Algeria
Karim Houali
Laboratoire de Biochimie Appliquée et Biotechnologies (LABAB), Faculté des Sciences Biologiques et des Sciences Agronomiques, Université Mouloud MAMMERI de Tizi-Ouzou, Tizi-Ouzou 15000, Algeria
Essential oils (EOs) obtained by hydro-distillation from different parts of twigs (EOT), leaves (EOL), and fruits (EOF) of Eucalyptus gunnii Hook. f. were screened for their chemical composition, insecticidal, repellence, and antibacterial properties. Based on GC and GC/MS analysis, 23 constituents were identified across the twigs, leaves, and fruits, with 23, 23, and 21 components, respectively. The primary significant class was oxygenated monoterpenes (82.2–95.5%). The main components were 1,8-cineole (65.6–86.1%), α-terpinyl acetate (2.5–7.6%), o-cymene (3.3–7.5%), and α-terpineol (3.3–3.5%). All three EOs exhibited moderate antibacterial activities. EOL was found to have higher antibacterial activity against all tested strains except Dickeya solani (CFBP 8199), for which EOT showed more potency. Globally, Dickeya solani (CFBP 8199) was the most sensitive (MIC ≤ 2 mg/mL), while the most resistant bacteria were Dickeya dadantii (CFBP 3855) and Pectobacterium carotovorum subsp. carotovorum (CFBP 5387). Fumigant, contact toxicity, and repellent bioassays showed different potential depending on plant extracts, particularly EOT and EOL as moderate repellents and EOT as a medium toxicant.
