Essential oils from Leptospermums of the Sunshine Coast and Northern Rivers Regions

Windsor, Sarah; Brooks, Peter

doi:10.1186/1752-153x-6-38

Cited by 6 publications

(4 citation statements)

References 16 publications

(84 reference statements)

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“…The yield of our sample of L. petersonii was higher than other species of genus Leptospermum. In fact, Windsor and Brooks (2012) in their study observed a yield of 0.01-0.06% for Leptospermum laevigatum, 0.06-0.2% Leptospermum speciosum, and 0.2-0.4% for Leptospermum trinervium. Van Vuuren et al 2014demonstrated that for L. petersonii annual EO yields ranged from 0.4% (in February) and 1.8% (in March).…”

Section: Essential Oils Yield and Chemical Compositionmentioning

confidence: 89%

Chemical Composition and Biological Activities of the Essential Oils of Leptospermum petersonii and Eucalyptus gunnii

et al. 2020

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The aim of this study was to characterize the chemical composition and to evaluate the antimicrobial and phytotoxic properties of the essential oils (EOs) obtained from leaves of Leptospermum petersonii chemotype "Variety B" and Eucalyptus gunnii, native to Australia. Geranyl acetate, γ-terpinene, geraniol, terpinolene, α-pinene, p-cimene, and linalool were the main components in L. petersonii EO, confirming also the existence of several chemotypes in such taxa; on the other hand, 1,8-cineole, trans-sabinene hydrate acetate, globulol, longicyclene, terpinolene, and camphene were present in major amounts in the E. gunnii EO. Chemical analysis of L. petersonii revealed that it belongs to the variety "B." E. gunnii EO showed good antibacterial activity, with an MIC of 0.5 and 2 µg/mL against Staphylococcus aureus, and Pectobacterium carotovorum, respectively. The activity of E. gunnii EO was stronger than L. petersonii EO, whose maximum MIC reached 5 µg/mL. E. gunnii and L. petersonii EOs were particularly effective in inhibiting the biofilm formation by S. aureus, already at a concentration of 0.01 µg/mL. The other strains were resistant to both EOs up to a dose of 0.05 µg/mL. The maximum inhibition on biofilm formed by P. carotovorum was recorded for E. gunnii EO, reaching a value of 93.12% at 1.0 µg/mL. This is the first manuscript which studies the biofilm inhibition by EOs and evaluates their effects on biofilm metabolism. Both EOs were more effective against P. carotovorum. In addition, even though L. petersonii EO 0.1 µg/mL was unable to inhibit biofilm formation by Escherichia coli, it decreased the metabolic activity of the biofilm to 78.55% compared to control; furthermore, despite it inducing a relatively low inhibition (66.67%) on biofilm formation, it markedly affected metabolic activity, which decreased to 16.09% with respect to the control. On the contrary, L. petersonii EO 0.5 µg/mL induced a 79.88% inhibition of S. aureus

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Section: Essential Oils Yield and Chemical Compositionmentioning

confidence: 89%

Chemical Composition and Biological Activities of the Essential Oils of Leptospermum petersonii and Eucalyptus gunnii

et al. 2020

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“…GC-MS results were interpreted against NIST library, mass spectra of chemical references, and the literature on norisoprenoids and other volatiles from honeys and nectars including Leptospermum sources. 2327,28 The quantitation of compounds was undertaken by the internal standard method using hexadecane C 16 (stock 8.89 μg/100 mL) in the GC-MS analyses. The peak areas were standardized to hexadecane areas to the mass (μg/g) of individual components in honey.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

In Vitro Antibacterial Phenolic Extracts from “Sugarbag” Pot-Honeys of Australian Stingless Bees (Tetragonula carbonaria)

Massaro

Shelley

Heard

et al. 2014

J. Agric. Food Chem.

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Australian stingless bee honeys have been shown to exert antioxidant and in vitro antimicrobial properties; however their bioactive factors remained unidentified. This study investigated the antibacterial properties of phenolic extracts from Tetragonula carbonaria honeys. Honeys were harvested from beehives in three sites of South East Australia. Liquid-liquid extractions yielded the phenolic concentrates, for analyses by liquid and gas chromatography mass spectrometry. Antibacterial assays were conducted against Staphylococcus aureus and Klebsiella pneumoniae by in vitro agar diffusion and broth dilution assays. The phenolic extracts averaged to 5.87 mg/100 g of raw honeys, and constituents were 3-phenyllactic acid, lumichrome, diglycosylflavonoids, norisoprenoids. The honeys did not contain methylglyoxal, dihydroxyacetone or phenolics characteristic of Leptospermum nectars. Hydrogen peroxide content amounted up to 155.8 μM in honeys. Beside the bactericidal effects of hydrogen peroxide at 760 μM, other antibacterial factors were the phenolic extracts of "sugarbag" honeys that were active at minimum bactericidal concentrations of 1.2-1.8 mg/mL.

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“…The genus Leptospermum belongs to the Myrtaceae family and includes approximately 80 species that are widespread around the world, particularly in Australia [6]. To date, only a small fraction of medicinal species in this genus have been analyzed chemically or explored for their potential biological activities [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Rhytidhyesters A – D, 4 New Chlorinated Cyclopentene Derivatives from the Endophytic Fungus Rhytidhysteron sp. BZM-9

et al. 2021

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Four new chlorinated cyclopentene derivatives, rhytidhyesters A – D (1 – 4), were isolated from Rhytidhysteron sp. BZM-9, an endophytic fungus from Leptospermum brachyandrum. The planar structures of compounds 1 – 4 were mainly elucidated by 1D, 2D NMR, and HRESIMS data. Their absolute configurations were established by X-ray crystallographic analysis, quantum chemical 13C NMR, and electronic circular dichroism calculations. Compounds 1 and 2 are a pair of epimers. Moreover, all the isolated compounds were evaluated for cytotoxic activities against 3 human colon cancer cell lines (SW620, HT29, SW480) and antimicrobial activity against Staphylococcus aureus. All compounds exhibited weak to moderate antiproliferative activities with IC50 values ranging from 15.4 to 37.7 µM but were inactive against S. aureus.

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Essential oils from Leptospermums of the Sunshine Coast and Northern Rivers Regions

Cited by 6 publications

References 16 publications

Chemical Composition and Biological Activities of the Essential Oils of Leptospermum petersonii and Eucalyptus gunnii

Chemical Composition and Biological Activities of the Essential Oils of Leptospermum petersonii and Eucalyptus gunnii

In Vitro Antibacterial Phenolic Extracts from “Sugarbag” Pot-Honeys of Australian Stingless Bees (Tetragonula carbonaria)

Rhytidhyesters A – D, 4 New Chlorinated Cyclopentene Derivatives from the Endophytic Fungus Rhytidhysteron sp. BZM-9

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