Litsea cubeba leaf essential oil from Vietnam: chemical diversity and its impacts on antibacterial activity

The threat of bacterial resistance to antibiotics has created an urgent need to develop new antimicrobials. The aim of this study was to characterize the chemical diversity of Litsea cubeba leaf essential oil (EO) and its impacts on the antibacterial activity against pathogenic bacteria. Essential o...

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Veröffentlicht in:Letters in applied microbiology 2018-03, Vol.66 (3), p.207-214
Hauptverfasser: Nguyen, H.V., Meile, J.‐C., Lebrun, M., Caruso, D., Chu‐Ky, S., Sarter, S.
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container_end_page 214
container_issue 3
container_start_page 207
container_title Letters in applied microbiology
container_volume 66
creator Nguyen, H.V.
Meile, J.‐C.
Lebrun, M.
Caruso, D.
Chu‐Ky, S.
Sarter, S.
description The threat of bacterial resistance to antibiotics has created an urgent need to develop new antimicrobials. The aim of this study was to characterize the chemical diversity of Litsea cubeba leaf essential oil (EO) and its impacts on the antibacterial activity against pathogenic bacteria. Essential oils collected from seven provinces in North Vietnam (n = 25) were characterized by their high content in either 1,8‐cineole or linalool. Linalool‐type EOs were more effective against the eight bacterial strains tested than 1,8‐cineole‐type. Oil samples, LC19 (50% 1,8‐cineole) and BV27 (94% linalool), were selected to investigate their antibacterial mechanisms against Escherichia coli. A strong bactericidal effect was observed after 4 and 2 h of exposure respectively. Microscopic analysis of treated E. coli cultures clearly showed that EOs caused changes in cell morphology, loss of integrity and permeability of the cell membrane, as well as DNA loss. However, the effects of both EOs were distinct. LC19 mostly affected cell membrane, led to a significant cell filamentation rate and altered cell width, whereas BV27 damaged cell membrane integrity leading to cell permeabilization and altered nucleoid morphology with the appearance of spot and visibly altered compaction. Significance and Impact of the Study This study aimed to characterize the chemical diversity of Litsea cubeba leaf essential oil (EO) and its impacts on its antibacterial activity. Two major chemotypes (1,8‐cineole or linalool rich) were identified in North Vietnam and both were bactericidal against several pathogenic bacteria. A distinct inhibitory effect of EO samples on Escherichia coli was observed. 1,8‐cineole‐rich sample (LC19) affected cell membrane, led to cell filamentation and perturbation of cell width, while the linalool‐rich one (BV27) induced damages in the cell membrane and changes in the nucleoid morphology. The study demonstrates the importance of considering chemotype variations in terms of chemical composition as well as the mode of action. Significance and Impact of the Study: This study aimed to characterize the chemical diversity of Litsea cubeba leaf essential oil (EO) and its impacts on its antibacterial activity. Two major chemotypes (1,8‐cineole or linalool rich) were identified in North Vietnam and both were bactericidal against several pathogenic bacteria. A distinct inhibitory effect of EO samples on Escherichia coli was observed. 1,8‐cineole‐rich sample (LC19) affected c
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The aim of this study was to characterize the chemical diversity of Litsea cubeba leaf essential oil (EO) and its impacts on the antibacterial activity against pathogenic bacteria. Essential oils collected from seven provinces in North Vietnam (n = 25) were characterized by their high content in either 1,8‐cineole or linalool. Linalool‐type EOs were more effective against the eight bacterial strains tested than 1,8‐cineole‐type. Oil samples, LC19 (50% 1,8‐cineole) and BV27 (94% linalool), were selected to investigate their antibacterial mechanisms against Escherichia coli. A strong bactericidal effect was observed after 4 and 2 h of exposure respectively. Microscopic analysis of treated E. coli cultures clearly showed that EOs caused changes in cell morphology, loss of integrity and permeability of the cell membrane, as well as DNA loss. However, the effects of both EOs were distinct. LC19 mostly affected cell membrane, led to a significant cell filamentation rate and altered cell width, whereas BV27 damaged cell membrane integrity leading to cell permeabilization and altered nucleoid morphology with the appearance of spot and visibly altered compaction. Significance and Impact of the Study This study aimed to characterize the chemical diversity of Litsea cubeba leaf essential oil (EO) and its impacts on its antibacterial activity. Two major chemotypes (1,8‐cineole or linalool rich) were identified in North Vietnam and both were bactericidal against several pathogenic bacteria. A distinct inhibitory effect of EO samples on Escherichia coli was observed. 1,8‐cineole‐rich sample (LC19) affected cell membrane, led to cell filamentation and perturbation of cell width, while the linalool‐rich one (BV27) induced damages in the cell membrane and changes in the nucleoid morphology. The study demonstrates the importance of considering chemotype variations in terms of chemical composition as well as the mode of action. Significance and Impact of the Study: This study aimed to characterize the chemical diversity of Litsea cubeba leaf essential oil (EO) and its impacts on its antibacterial activity. Two major chemotypes (1,8‐cineole or linalool rich) were identified in North Vietnam and both were bactericidal against several pathogenic bacteria. A distinct inhibitory effect of EO samples on Escherichia coli was observed. 1,8‐cineole‐rich sample (LC19) affected cell membrane, led to cell filamentation and perturbation of cell width, while the linalool‐rich one (BV27) induced damages in the cell membrane and changes in the nucleoid morphology. 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The aim of this study was to characterize the chemical diversity of Litsea cubeba leaf essential oil (EO) and its impacts on the antibacterial activity against pathogenic bacteria. Essential oils collected from seven provinces in North Vietnam (n = 25) were characterized by their high content in either 1,8‐cineole or linalool. Linalool‐type EOs were more effective against the eight bacterial strains tested than 1,8‐cineole‐type. Oil samples, LC19 (50% 1,8‐cineole) and BV27 (94% linalool), were selected to investigate their antibacterial mechanisms against Escherichia coli. A strong bactericidal effect was observed after 4 and 2 h of exposure respectively. Microscopic analysis of treated E. coli cultures clearly showed that EOs caused changes in cell morphology, loss of integrity and permeability of the cell membrane, as well as DNA loss. However, the effects of both EOs were distinct. LC19 mostly affected cell membrane, led to a significant cell filamentation rate and altered cell width, whereas BV27 damaged cell membrane integrity leading to cell permeabilization and altered nucleoid morphology with the appearance of spot and visibly altered compaction. Significance and Impact of the Study This study aimed to characterize the chemical diversity of Litsea cubeba leaf essential oil (EO) and its impacts on its antibacterial activity. Two major chemotypes (1,8‐cineole or linalool rich) were identified in North Vietnam and both were bactericidal against several pathogenic bacteria. A distinct inhibitory effect of EO samples on Escherichia coli was observed. 1,8‐cineole‐rich sample (LC19) affected cell membrane, led to cell filamentation and perturbation of cell width, while the linalool‐rich one (BV27) induced damages in the cell membrane and changes in the nucleoid morphology. The study demonstrates the importance of considering chemotype variations in terms of chemical composition as well as the mode of action. Significance and Impact of the Study: This study aimed to characterize the chemical diversity of Litsea cubeba leaf essential oil (EO) and its impacts on its antibacterial activity. Two major chemotypes (1,8‐cineole or linalool rich) were identified in North Vietnam and both were bactericidal against several pathogenic bacteria. A distinct inhibitory effect of EO samples on Escherichia coli was observed. 1,8‐cineole‐rich sample (LC19) affected cell membrane, led to cell filamentation and perturbation of cell width, while the linalool‐rich one (BV27) induced damages in the cell membrane and changes in the nucleoid morphology. 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The aim of this study was to characterize the chemical diversity of Litsea cubeba leaf essential oil (EO) and its impacts on the antibacterial activity against pathogenic bacteria. Essential oils collected from seven provinces in North Vietnam (n = 25) were characterized by their high content in either 1,8‐cineole or linalool. Linalool‐type EOs were more effective against the eight bacterial strains tested than 1,8‐cineole‐type. Oil samples, LC19 (50% 1,8‐cineole) and BV27 (94% linalool), were selected to investigate their antibacterial mechanisms against Escherichia coli. A strong bactericidal effect was observed after 4 and 2 h of exposure respectively. Microscopic analysis of treated E. coli cultures clearly showed that EOs caused changes in cell morphology, loss of integrity and permeability of the cell membrane, as well as DNA loss. However, the effects of both EOs were distinct. LC19 mostly affected cell membrane, led to a significant cell filamentation rate and altered cell width, whereas BV27 damaged cell membrane integrity leading to cell permeabilization and altered nucleoid morphology with the appearance of spot and visibly altered compaction. Significance and Impact of the Study This study aimed to characterize the chemical diversity of Litsea cubeba leaf essential oil (EO) and its impacts on its antibacterial activity. Two major chemotypes (1,8‐cineole or linalool rich) were identified in North Vietnam and both were bactericidal against several pathogenic bacteria. A distinct inhibitory effect of EO samples on Escherichia coli was observed. 1,8‐cineole‐rich sample (LC19) affected cell membrane, led to cell filamentation and perturbation of cell width, while the linalool‐rich one (BV27) induced damages in the cell membrane and changes in the nucleoid morphology. The study demonstrates the importance of considering chemotype variations in terms of chemical composition as well as the mode of action. Significance and Impact of the Study: This study aimed to characterize the chemical diversity of Litsea cubeba leaf essential oil (EO) and its impacts on its antibacterial activity. Two major chemotypes (1,8‐cineole or linalool rich) were identified in North Vietnam and both were bactericidal against several pathogenic bacteria. A distinct inhibitory effect of EO samples on Escherichia coli was observed. 1,8‐cineole‐rich sample (LC19) affected cell membrane, led to cell filamentation and perturbation of cell width, while the linalool‐rich one (BV27) induced damages in the cell membrane and changes in the nucleoid morphology. The study demonstrates the importance of considering chemotype variations in terms of chemical composition as well as the mode of action.</abstract><cop>England</cop><pub>Oxford University Press</pub><pmid>29266378</pmid><doi>10.1111/lam.12837</doi><tpages>8</tpages><orcidid>https://orcid.org/0000-0001-5115-0824</orcidid></addata></record>
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subjects Anti-Bacterial Agents - pharmacology
Antibacterial activity
antibacterial mechanism
Antibiotics
Antimicrobial agents
Bacteria
Cell Membrane - drug effects
Cell morphology
Chemical composition
chemical diversity
Cineole
Cyclohexanols - pharmacology
Cytology
Deoxyribonucleic acid
DNA
E coli
Escherichia coli
Escherichia coli - drug effects
Essential oils
Filamentation
Integrity
Leaves
Life Sciences
Linalool
Litsea - chemistry
Litsea cubeba
Membrane permeability
Microbial Sensitivity Tests
Microscopic analysis
Mode of action
Monoterpenes - pharmacology
Morphology
Oils & fats
Oils, Volatile - pharmacology
pathogenic bacteria
Permeability
Plant Leaves - chemistry
Vietnam
title Litsea cubeba leaf essential oil from Vietnam: chemical diversity and its impacts on antibacterial activity
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