Chemical characteristics and antimicrobial effects of some Eucalyptus kinos

Martius, S. Von; Hammer, Katherine A.; Locher, Cornelia

doi:10.1016/j.jep.2012.09.011

Cited by 33 publications

(29 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Eucalyptus extracts showed potent activity against gram-positive bacteria (although not B. subtilis) and also the gram-negative bacteria P. aeruginosa. This matches findings of other researchers: aqueous extracts of kinos from 13 Eucalyptus species had activity against the gram-positive bacteria S. aureus and B. subtilis, 13 whilst aqueous extracts of E. olida and E. staigerana also showed activity against S. aureus (MIC 15.6 μg/ml and 125 μg/ml, respectively) although no activity against six other bacteria. 3 The essential oils of M. alternifolia have well documented antibacterial activity against a broad spectrum of bacteria 15,19,24,25 while the activity of aqueous Melaleuca extracts are less well documented.…”

Section: Discussionsupporting

confidence: 90%

Antimicrobial Activity of Extracts from Native Plants of Temperate Australia

Wigmore¹,

Naiker²,

Bean³

2016

View full text Add to dashboard Cite

Introduction: Significant effort has been invested in looking at the antimicrobial activity of plant extracts from tropical regions of Australia, with less interest in those from more temperate environments. We sought to redress this imbalance by examining antimicrobial activities of extracts from native plants of Victoria. Methods: Sixteen plant samples were obtained around the Ballarat region of Victoria. Plant material was desiccated, ground and extracted with methanol at room temperature. Methanol extracts were subsequently dissolved in water, filtered and freeze dried. Extracts were dissolved in water and their activity determined against eight bacterial species. Plant extracts that showed appreciable antibacterial activity in the initial antimicrobial screen were examined further with both their MICs and MBCs determined. Results: Ten of the sixteen plant extracts showed antimicrobial activity. Extracts of Eucalyptus, Melaleuca, Prostanthera and Westringia were particularly active with MICs as low as 0.25 mg/ml against organisms including P. aeruginosa and S. aureus. Conclusion: The current study demonstrates the antimicrobial activity of plant extracts from temperate Australia. These may serve as precursors for future chemotherapy agents.

show abstract

Section: Discussionsupporting

confidence: 90%

Antimicrobial Activity of Extracts from Native Plants of Temperate Australia

Wigmore¹,

Naiker²,

Bean³

2016

View full text Add to dashboard Cite

show abstract

“…The amount of condensed tannins in DW and MeOH extracts of E. globulus leaves was higher than some Eucalyptus species such as Eucalyptus cladocalyx, Eucalyptus platypus, Eucalyptus stowardii, Eucalyptus gomphocephala and Eucalyptus flocktoniae (Martius et al, 2012). The condensed tannins content in M. viridis MeOH extract was higher than in M. pulegium (Khaled-Khodja et al, 2014) and in Mentha piperata MeOH extracts (Sujana et al, 2013).…”

Section: Amount Of Condensed Tanninsmentioning

confidence: 82%

Antioxidant and anti-lipases activities in vitro of Mentha viridis and Eucalyptus globulus extracts

Belfeki

Mejri²,

Hassouna

2016

Industrial Crops and Products

View full text Add to dashboard Cite

“…Aqueous kino extracts from 15 eucalypt species have recently been tested for their antimicrobial activity against S. aureus , Bacillus subtilis, Kocuria rhizophila, Pseudomonas aeruginosa, Escherichia coli , and Saccharomyces cerevisiae . Extracts from C. maculata , C. ficifolia , and C. calophylla kino exhibited strong activity against the Gram-positive bacteria, although no activity was observed from any of the eucalypt species against the Gram-negative bacteria [ 17 ]. Aqueous and ethanolic extracts from C. intermedia leaves also exhibit antimicrobial activity against S. aureus and the unicellular fungus, Candida albicans [ 13 ].…”

Section: Introductionmentioning

confidence: 99%

Antibacterial Properties of Flavonoids from Kino of the Eucalypt Tree, Corymbia torelliana

Nobakht¹,

Trueman²,

Wallace³

et al. 2017

Plants

View full text Add to dashboard Cite

Traditional medicine and ecological cues can both help to reveal bioactive natural compounds. Indigenous Australians have long used kino from trunks of the eucalypt tree, Corymbia citriodora, in traditional medicine. A closely related eucalypt, C. torelliana, produces a fruit resin with antimicrobial properties that is highly attractive to stingless bees. We tested the antimicrobial activity of extracts from kino of C. citriodora, C. torelliana × C. citriodora, and C. torelliana against three Gram-negative and two Gram-positive bacteria and the unicellular fungus, Candida albicans. All extracts were active against all microbes, with the highest activity observed against P. aeruginosa. We tested the activity of seven flavonoids from the kino of C. torelliana against P. aeruginosa and S. aureus. All flavonoids were active against P. aeruginosa, and one compound, (+)-(2S)-4′,5,7-trihydroxy-6-methylflavanone, was active against S. aureus. Another compound, 4′,5,7-trihydroxy-6,8-dimethylflavanone, greatly increased biofilm formation by both P. aeruginosa and S. aureus. The presence or absence of methyl groups at positions 6 and 8 in the flavonoid A ring determined their anti-Staphylococcus and biofilm-stimulating activity. One of the most abundant and active compounds, 3,4′,5,7-tetrahydroxyflavanone, was tested further against P. aeruginosa and was found to be bacteriostatic at its minimum inhibitory concentration of 200 µg/mL. This flavanonol reduced adhesion of P. aeruginosa cells while inducing no cytotoxic effects in Vero cells. This study demonstrated the antimicrobial properties of flavonoids in eucalypt kino and highlighted that traditional medicinal knowledge and ecological cues can reveal valuable natural compounds.

show abstract

Chemical characteristics and antimicrobial effects of some Eucalyptus kinos

Cited by 33 publications

References 28 publications

Antimicrobial Activity of Extracts from Native Plants of Temperate Australia

Antimicrobial Activity of Extracts from Native Plants of Temperate Australia

Antioxidant and anti-lipases activities in vitro of Mentha viridis and Eucalyptus globulus extracts

Antibacterial Properties of Flavonoids from Kino of the Eucalypt Tree, Corymbia torelliana

Contact Info

Product

Resources

About