Huile essentielle d’Arbre à thé ou de Tea tree

2019 ◽  
Vol 58 (583) ◽  
pp. 59-61
Author(s):  
Dominique Laurain-Mattar ◽  
Françoise Couic-Marinier
Keyword(s):  
Huile Essentielle ◽  
Tea Tree

Lavender, Tea Tree Oils May Cause Gynecomastia

2007 ◽  
Vol 41 (3) ◽  
pp. 46
Author(s):  
MARY ANN MOON
Keyword(s):  
Tea Tree

THE BACTERIAL MULTIPLE ANTIBIOTIC RESISTANT (MAR) PHENOTYPE LEADS TO INCREASED TOLERANCE TO TEA TREE OIL

Pathology ◽  
2001 ◽  
Vol 33 (2) ◽  
pp. 211-215 ◽  
Author(s):  
John E. Gustafson ◽  
Sean D. Cox ◽  
Yoon C. Liew ◽  
S. Grant Wyllie ◽  
John R. Warmington
Keyword(s):  
Tea Tree Oil ◽  
Antibiotic Resistant ◽  
Tea Tree

A new sesquiterpenoid from tea tree oil residue

Planta Medica ◽  
2015 ◽  
Vol 81 (05) ◽  
Author(s):  
S Liang ◽  
Z Ali ◽  
M Wang ◽  
IA Khan
Keyword(s):  
Tea Tree Oil ◽  
Tea Tree ◽  
Oil Residue

scholarly journals Activity of Specialized Biomolecules against Gram-Positive and Gram-Negative Bacteria

Antibiotics ◽  
2020 ◽  
Vol 9 (6) ◽  
pp. 314 ◽  
Author(s):  
Tânia D. Tavares ◽  
Joana C. Antunes ◽  
Jorge Padrão ◽  
Ana I. Ribeiro ◽  
Andrea Zille ◽  
...  
Keyword(s):  
Cell Morphology ◽  
Time Averaging ◽  
Gram Negative Bacteria ◽  
Gram Positive ◽  
Intracellular Space ◽  
Gram Negative ◽  
Tea Tree ◽  
Minimal Inhibitory Concentrations ◽  
Agar Diffusion Test ◽  
Short Period

The increased resistance of bacteria against conventional pharmaceutical solutions, the antibiotics, has raised serious health concerns. This has stimulated interest in the development of bio-based therapeutics with limited resistance, namely, essential oils (EOs) or antimicrobial peptides (AMPs). This study envisaged the evaluation of the antimicrobial efficacy of selected biomolecules, namely LL37, pexiganan, tea tree oil (TTO), cinnamon leaf oil (CLO) and niaouli oil (NO), against four bacteria commonly associated to nosocomial infections: Staphylococcus aureus, Staphylococcus epidermidis, Escherichia coli and Pseudomonas aeruginosa. The antibiotic vancomycin and silver nanoparticles (AgNPs) were used as control compounds for comparison purposes. The biomolecules were initially screened for their antibacterial efficacy using the agar-diffusion test, followed by the determination of minimal inhibitory concentrations (MICs), kill-time kinetics and the evaluation of the cell morphology upon 24 h exposure. All agents were effective against the selected bacteria. Interestingly, the AgNPs required a higher concentration (4000–1250 μg/mL) to induce the same effects as the AMPs (500–7.8 μg/mL) or EOs (365.2–19.7 μg/mL). Pexiganan and CLO were the most effective biomolecules, requiring lower concentrations to kill both Gram-positive and Gram-negative bacteria (62.5–7.8 μg/mL and 39.3–19.7 μg/mL, respectively), within a short period of time (averaging 2 h 15 min for all bacteria). Most biomolecules apparently disrupted the bacteria membrane stability due to the observed cell morphology deformation and by effecting on the intracellular space. AMPs were observed to induce morphological deformations and cellular content release, while EOs were seen to split and completely envelope bacteria. Data unraveled more of the potential of these new biomolecules as replacements for the conventional antibiotics and allowed us to take a step forward in the understanding of their mechanisms of action against infection-related bacteria.

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