Chemical and Biological Evaluation of Essential Oils from Two Species of Myrtaceae — Eugenia uniflora L. and Plinia trunciflora (O. Berg) Kausel

Abstract

The chemical composition and antimicrobial activity of essential oils obtained from leaves of two Myrtaceae species–Eugenia uniflora L. and Plinia trunciflora (O. Berg) Kausel–were determined. Analysis by GC/MS as well as determination of Kovatz indexes indicated atractylone (26.78%) and curzerene (17.96%) as major constituents of E. uniflora oil and α-cadinol (19.15%), apiole (11.15%) and cubenol (5.43%) as main components in P. trunciflora oil. Both essential oils were tested for antimicrobial activity against yeasts and bacteria. E. uniflora and P. trunciflora essential oils were active towards two Gram-positive bacteria, Streptococcus equi and Staphylococcus epidermis. In addition, biological activity of both essential oils was detected for pathogenic yeasts of the genus Candida and Cryptococcus. E. uniflora was active towards all yeast tested and exhibited interesting minimal inhibitory concentrations (0.11 to 3.75 mg/mL) across a broad spectrum of activity.

Antimicrobial efficacy of the extract, fractions and essential oils from the leaves of <i>Eugenia uniflora</i> Linn (Myrtaceae)

“…Organisms/Concentration (mg/ ml) the essential oil from E. uniflora leaves revealed fifty-one compounds of which benzofuran (17.23 %) was the major compound, including cryophyllene, gamma-elemene and beta-copaene, as previously reported by Melo et al, 2007, Lago et al, 2011, Thambi et al, 2013. Constituents of essential oil obtained in this study compared with those reported from E. uniflora in Brazil, Argentina and India (Melo et al, 2007;Lago et al, 2011 andThambi et al, 2013.…”

“…Constituents of essential oil obtained in this study compared with those reported from E. uniflora in Brazil, Argentina and India (Melo et al, 2007;Lago et al, 2011 andThambi et al, 2013.…”

<i>In vitro</i> Antibacterial and Chemical Properties of Essential Oils Including Native Plants from Brazil against Pathogenic and Resistant Bacteria

“…The MIC values for M. recutita EO reported here range from 25.80 to 54.40 mg/mL, which are higher values than in the literature. Cinnamomum comprises about 250 species, with C. zeylanicum being the most important 37 ; the compound found in the EO prepared with leaves is eugenol, and in , and the results showed again that antimicrobial activity was varied against fungi and Gram-positive bacteria strains MIC 0.11 to 7.5 mg/mL respectively however without any effect against Gram-negative strains 40 . The MIC 90 values ranged from 50.80 to 92.40 mg/mL, which was higher than those observed in other studies; one explanation may be related to the source of bacterial strains e.g.…”

Essential oil composition of Eugenia langsdorffii O. Berg.: relationships between some terpenoids and toxicity against Tetranychus urticae

“…Moreover, none of the Eugenia species listed in recent review by Stefanello et al 24 showed the presence of epi-longipinanol and 10-epi-g-eudesmol, the major components indentified in the leaf and fruit oils of E. langsdorffii, respectively. On the other hand, the second major component of fruit oil (1,10-epi-cubenol (15.6 ± 0.3%)) was identified in the leaf oil of E. neonitida 25 and Plinia trunciflora 26 in percentage lower than 0.5%.…”

“…24 In fact, these oils were characterized by high percentages of sesquiterpenes (72.2 ± 0.9% in leaves and 92.2 ± 0.2% in fruits), followed by monoterpenes. The monoterpne a-pinene and the sesquiterpenes germacrene D, bicyclogermacrene, β-caryophyllene and β-elemene, which were found in Eugenia species as principal components, [24][25][26][27][28][29] were not detected in the leaf and fruit oils of E. langsdorffii. Moreover, none of the Eugenia species listed in recent review by Stefanello et al 24 showed the presence of epi-longipinanol and 10-epi-g-eudesmol, the major components indentified in the leaf and fruit oils of E. langsdorffii, respectively.…”