Cited by 36Essential Oils and Antimicrobial ActivityInsect Pest Control StrategiesPhytochemistry and Biological Activities

Chemical composition of essential oils of eight Tunisian Eucalyptus species and their antibacterial activity against strains responsible for otitis

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Ameur, Elaissi, Sarra, Moumni, Yosra, Derbali, Mariem, Khouja, Nabil, Abid, Lynen, Frederic, Larbi, Khouja Mohamed·2021·BMC Complementary Medicine and Therapies

Abstract

Background: The chemical composition and biological activity of Eucalyptus essential oils have been studied extensively (EOs). A few of them were tested for antibacterial effectiveness against otitis strains. The chemical composition and antibacterial activity of the EOs of eight Tunisian Eucalyptus species were assessed in the present study. Methods: Hydrodistillation was used to extract EOs from the dried leaves of eight Eucalyptus species:Eucalyptus accedens, Eucalyptus punctata, Eucalyptus robusta,Eucalyptus bosistoana, Eucalyptus cladocalyx, Eucalyptus lesouefii, Eucalyptus melliodora and Eucalyptus wandoo.They are assessed by GC/MS and GC/FID and evaluated for antibacterial activity using agar diffusion and broth microdilution techniques against three bacterial isolates (Haemophilus influenzae,Haemophilus parainfluenzae,Klebsiella pneumoniae) and three reference bacteria strains (Pseudomonas aeruginosa,ATTC 9027;Staphylococcus aureus,ATCC 6538; and Escherichia coli,ATCC 8739). Furthermore, the selected twenty-one major compounds and all values of the inhibition zone diameters were subjected to further statistical analysis using PCA and HCA. Results: The EO yields of the studied Eucalyptus species range from 1.4 ± 0.4% to 5.2 ± 0.3%. Among all the species studied,E. lesouefii had the greatest mean percentage of EOs. The identification of 128 components by GC (RI) and GC/MS allowed for 93.6% – 97.7% of the total oil to be identified.1,8-cineole was the most abundant component found, followed by α-pinene,p-cymene, and globulol. The chemical components of the eight EOs, extracted from the leaves of Eucalyptus species, were clustered into seven groups using PCA and HCA analyses, with each group forming a chemotype. The PCA and HCA analyses of antibacterial activity, on the other hand, identified five groups. Conclusion: The oils of E. melliodora,E. bosistoana,and E. robusta show promise as antibiotic alternatives in the treatment of otitis media.

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  • The composition and extracted yield of essential oils depend on species, soil composition, plant organ, age, cycle stage, selected extraction method, and conditions of extraction.

    “Various authors have reported that the composition and extracted yield of EOs depends on the species, soil composition, plant organ (aerial parts, inflorescence, or roots), age, cycle stage, selected extraction method, and conditions of extraction [2,5,6,7,8,9,10,11,12,13,14,15,16,17].”

    From Clove essential oil (Syzygium aromaticum L. Myrtaceae): Extraction, chemical composition, food applications, and essential bioactivity for human health (2021) · cites this paper as [7]

    The Results (Oil Yields; page unavailable) report significant yield differences among Eucalyptus species. The Discussion (Chemical composition of the tested essential oils; page unavailable) links composition to soil type and physiological stage. The paper does not establish that plant organ, age, extraction method, or extraction conditions affect composition or yield; its Methods describe only one extraction procedure. (LLM, conf=0.87)

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Research works printed but not linked: 7

  1. [2]Bignell CM, Dunlop PJ, Brophy JJ, Fookes CJR. Volatile Leaf Oils of some South-western and Southern Australian Species of the Genus Eucalyptus (Series I). Part XIV. Subgenus Monocalyptus. Flavour Fragr J. 1997;12(3):177–183.
  2. [41]John Wiley & Sons. Wiley Registry® of Mass Spectral Data/NIST Spectral Data/CD Rom, 11thedition. Hoboken, NJ: Wiley-Blackwell; 2014.
  3. [52]Bignell CM, Dunlop PJ, Brophy JJ, Jackson JF. Volatile Leaf Oils of some Queensland and Northern Australian Species of the Genus Eucalyptus. (Series II). Part I. Subgenus Symphyomyrtus, Section Adnataria: (a) Series Oliganthae, (b) Series Ochrophloiae, (c) Series Moluccanae, (d) Series Polyanthemae, (e) Series Paniculatae, (f) Series Melliodorae and (g) Series Porantheroideae. Flavour Fragr J. 1997;12(1):19–27.
  4. [53]Esfahanianfard N, Sefidkon F, Bakhshi Khaniki G. Seasonal variation in the essential oil content and composition of three Eucalyptus species (Eucalyptus melliodora Cunn. ex Schauer, E. kingsmilli Maiden & Blakely and E. dundasii Maiden) from South Iran. Iran J of Med Arom Plants. 2011;27:97–126.
  5. [55]Bignell CM, Dunlop PJ, Brophy JJ. Volatile leaf oils of some Queensland and northern Australian species of the genus Eucalyptus (series II). Part II. Subgenera (a) Blakella, (b) Corymbia, (c) Unnamed, (d) Idiogenes, (e) Monocalyptus and (f) Symphyomyrtus. Flavour Fragr J. 1997;12(4):277–284.
  6. [73]Alfian Z, Taufik M, Marpaung H, Sibarani IJ. Analysis of composition and sineol determination of eucalyptus oil (Eucalyptus Robusta) from PT. Toba Pulp Lestari Used Gc-Ms Method. Int J Appl Chem (IJAC). 2018;14(3):255–262.
  7. [88]Ezzeddine NBH-B, Abdelkéfi MM, Aissa RB, Chaabouni MM. Antibacterial Screening of Origanum majorana L. Oil from Tunisia. J Essent Oil Res. 2001;13(4):295–297.

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Authors
Ameur, E., Sarra, M., Yosra, D., Mariem, K., Nabil, A., Lynen, F., & Larbi, K. M.
Affiliations
  • University of Monastir (TN)
  • University of Carthage (TN)
Venue
BMC Complementary Medicine and Therapies
Published
2021-08-12
Volume
21
Issue
1
Pages
209-209
ISSN
2662-7671 (ISSN-L)
OpenAlex
W3191406706
Cited by
36
References
84
Citations by year
2026: 3 · 2025: 8 · 2024: 8 · 2023: 13 · 2022: 2 · 2021: 2
FWCI
3.73
Type
journal article
Language
en
Open access
Locations
  • BMC Complementary Medicine and Therapies (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • Ghent University Academic Bibliography (Ghent University) (submittedVersion, cc-by)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Topics
  • Life Sciences › Agricultural and Biological Sciences › Food Science › Essential Oils and Antimicrobial Activity
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Insect Pest Control Strategies
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Phytochemistry and Biological Activities
Keywords
eucalyptus oil, chemical composition, antibacterial activity, otitis media, Haemophilus influenzae, Haemophilus parainfluenzae, Klebsiella pneumoniae, chemotypes, 1,8-cineole, Eucalyptus melliodora, Eucalyptus robusta, Eucalyptus bosistoana, leaf essential oil
MeSH terms
Anti-Bacterial Agents, Eucalyptus, Humans, Microbial Sensitivity Tests, Oils, Volatile, Otitis, Plant Oils

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