Essential Oils from Different Plant Parts of Eucalyptus cinerea F. Muell. ex Benth. (Myrtaceae) as a Source of 1,8-Cineole and Their Bioactivities

Pharmaceuticals
Sayonara Mendes SilvaTomoe Nakashima

Abstract

Eucalyptus cinerea, known as silver dollar tree, has few descriptions in traditional medicine. Chemical composition and antimicrobial properties of the essential oils of leaves, flowers and fruits, collected seasonally, were determined by GC/MS and disk diffusion/MIC, respectively. 1,8-Cineole was the main compound, particularly in fresh leaves-Spring (74.98%), dried leaves-Spring (85.32%), flowers-Winter (78.76%) and fruits-Winter (80.97%). Other compounds were found in the aerial parts in all seasons: α-pinene (2.41% to 10.13%), limonene (1.46% to 4.43%), α-terpineol (1.73% to 11.72%), and α-terpinyl acetate (3.04% to 20.44%). The essential oils showed antimicrobial activities against bacteria and yeasts, with the best results being found for the dried autumn and winter leaves oils (MIC < 0.39 mg/mL) against Streptococcus pyogenes. For the other tested microorganisms the following MIC results were found: Staphylococcus aureus-Dried leaves oil from summer (0.78 mg/mL), Pseudomonas aeruginosa-Flowers oil from autumn and fruits oil from winter (1.56 mg/mL) and Candida albicans-Flowers oil from autumn and fruits oils from winter and spring (0.78 mg/mL).

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Citations

Dec 1, 2014·Annals of Botany·Christina L BorzakJulianne M O'Reilly-Wapstra
Sep 2, 2014·BioMed Research International·Amit Kumar TyagiMaria Elisabetta Guerzoni
Sep 16, 2020·Journal of Medical Microbiology·Karuppiah VijayakumarMadhavan Sathya
Dec 13, 2016·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Luiz Claudio Almeida BarbosaRobson Ricardo Teixeira
Mar 11, 2021·Colloids and Surfaces. B, Biointerfaces·Sholeh FeiziSarah Vreugde
Aug 28, 2021·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Wanda MączkaKatarzyna Wińska

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