Read by QxMD icon Read

Antimicrobial activity essential oil quorum sensing

Marina Pekmezovic, Ivana Aleksic, Aleksandra Barac, Valentina Arsic-Arsenijevic, Branka Vasiljevic, Jasmina Nikodinovic-Runic, Lidija Senerovic
Mixed microbial infections caused by Pseudomonas aeruginosa and pathogenic fungi are commonly found in patients with chronic infections and constitute a significant health care burden. The aim of this study was to address the potential polymicrobial antibiofilm activity of pompia and grapefruit essential oils (EOs). The mechanism of antimicrobial activity of EOs was analysed. EOs of pompia and grapefruit inhibited fungal growth with MIC concentrations between 50 and 250 mg L-1 , whereas no effect on P. aeruginosa growth was observed...
November 2016: Pathogens and Disease
Susana Alves, Andreia Duarte, Sónia Sousa, Fernanda C Domingues
Acinetobacter baumannii is a pathogen that has the ability to adhere to surfaces in the hospital environment and to form biofilms which are increasingly resistant to antimicrobial agents. The aim of this work was to study the antimicrobial activity of the major oil compounds of Coriandrum sativum against A. baumannii. The effect of linalool on planktonic cells and biofilms of A. baumannii on different surfaces, as well as its effect on adhesion and quorum sensing was evaluated. From all the compounds evaluated, linalool was the compound with the best antibacterial activity, with minimum inhibitory concentration values between 2 and 8 μl ml(-1)...
2016: Biofouling
Maria V Alvarez, Luis A Ortega-Ramirez, M Melissa Gutierrez-Pacheco, A Thalia Bernal-Mercado, Isela Rodriguez-Garcia, Gustavo A Gonzalez-Aguilar, Alejandra Ponce, Maria Del R Moreira, Sara I Roura, J Fernando Ayala-Zavala
Edible films can be used as carriers for antimicrobial compounds to assure food safety and quality; in addition, pathogenesis of food bacteria is related to a cell to cell communication mechanism called quorum sensing (QS). Oregano essential oil (OEO) has proved to be useful as food antimicrobial; however, its food applications can be compromised by the volatile character of its active constituents. Therefore, formulation of edible films containing OEO can be an alternative to improve its food usages. QS inhibitory activity of OEO and pectin-OEO films was evaluated using Chromobacterium violaceum as bacterial model...
2014: Frontiers in Microbiology
Jesus Olivero-Verbel, Ana Barreto-Maya, Angela Bertel-Sevilla, Elena E Stashenko
Many Gram-negative pathogens have the ability to produce N-acylhomoserine lactones (AHLs) as signal molecules for quorum sensing (QS). This cell-cell communication system allows them to coordinate gene expression and regulate virulence. Strategies to inhibit QS are promising for the control of infectious diseases or antibiotic resistant bacterial pathogens. The aim of the present study was to evaluate the anti-quorum sensing (anti-QS) and antibacterial potential of five essential oils isolated from Lippia alba on the Tn-5 mutant of Chromobacterium violaceum CV026, and on the growth of the gram-positive bacteria S...
2014: Brazilian Journal of Microbiology: [publication of the Brazilian Society for Microbiology]
Polly Soo Xi Yap, Thiba Krishnan, Kok-Gan Chan, Swee Hua Erin Lim
This study aimed to investigate the mechanism of action of the cinnamon bark essential oil (CB), when used singly and also in combination with piperacillin, for its antimicrobial and synergistic activity against beta-lactamase TEM-1 plasmid-conferred Escherichia coli J53 R1. Viable count of this combination showed a complete killing profile at 20 h and further confirmed its synergistic effect by reducing the bacteria cell numbers. Analysis on the stability of treated cultures for cell membrane permeability by CB when tested against sodium dodecyl sulfate revealed that the bacterial cell membrane was disrupted by the essential oils...
August 2015: Journal of Microbiology and Biotechnology
A Ahmad, A M Viljoen, H Y Chenia
UNLABELLED: Studies describing the use of essential oil constituents as antimicrobial agents have steadily increased; however, some phyto-constituents are often overlooked due to unfavourable minimum inhibitory concentration (MIC) values. Virulence depends on transcriptional factors which are regulated by cell-to-cell communication called quorum sensing (QS). This study was undertaken to evaluate the antimicrobial and anti-QS properties of 29 compounds commonly found in essential oils using two bioreporter strains...
January 2015: Letters in Applied Microbiology
P S X Yap, T Krishnan, B C Yiap, C P Hu, K-G Chan, S H E Lim
AIM: The aim of this study was to investigate the mode of action of the lavender essential oil (LV) on antimicrobial activity against multi-drug-resistant Escherichia coli J53 R1 when used singly and in combination with piperacillin. METHOD AND RESULTS: In the time-kill analysis, a complete killing of bacteria was observed based on colony counts within 4 h when LV was combined with piperacillin during exposure at determined FIC concentrations. Analysis of the membrane permeabilizing effects of LV on treated cultures through their stability against sodium dodecyl sulphate revealed that the LV played a role in disrupting the bacterial cell membrane...
May 2014: Journal of Applied Microbiology
Sara A Burt, Victoria T A Ojo-Fakunle, Jenifer Woertman, Edwin J A Veldhuizen
The formation of biofilm by bacteria confers resistance to biocides and presents problems in medical and veterinary clinical settings. Here we report the effect of carvacrol, one of the major antimicrobial components of oregano oil, on the formation of biofilms and its activity on existing biofilms. Assays were carried out in polystyrene microplates to observe (a) the effect of 0-0.8 mM carvacrol on the formation of biofilms by selected bacterial pathogens over 24 h and (b) the effect of 0-8 mM carvacrol on the stability of pre-formed biofilms...
2014: PloS One
K Glinel, P Thebault, V Humblot, C M Pradier, T Jouenne
Prevention of bacterial adhesion and biofilm formation on the surfaces of materials is a topic of major medical and societal importance. Various synthetic approaches based on immobilization or release of bactericidal substances such as metal derivatives, polyammonium salts and antibiotics were extensively explored to produce antibacterial coatings. Although providing encouraging results, these approaches suffer from the use of active agents which may be associated with side-effects such as cytotoxicity, hypersensibility, inflammatory responses or the progressive alarming phenomenon of antibiotic resistance...
May 2012: Acta Biomaterialia
Lorena S Derengowski, Calliandra De-Souza-Silva, Shélida V Braz, Thiago M Mello-De-Sousa, Sônia N Báo, Cynthia M Kyaw, Ildinete Silva-Pereira
BACKGROUND: Farnesol is a sesquiterpene alcohol produced by many organisms, and also found in several essential oils. Its role as a quorum sensing molecule and as a virulence factor of Candida albicans has been well described. Studies revealed that farnesol affect the growth of a number of bacteria and fungi, pointing to a potential role as an antimicrobial agent. METHODS: Growth assays of Paracoccidioides brasiliensis cells incubated in the presence of different concentrations of farnesol were performed by measuring the optical density of the cultures...
2009: Annals of Clinical Microbiology and Antimicrobials
Roni Shapira, Efrat Mimran
The antimicrobial mode of action of the plant essential oil thymol was studied with Escherichia coli. Random transposon-insertion mutants were screened for altered response to thymol. Of four mutants showing more sensitivity, three were found in rfaQ, whose product is involved in lipopolysaccharide biosynthesis, and the fourth in the quorum-sensing gene qseC. Mutants showing more resistance had mutations in genes whose products are involved in the degradation of short-lived regulatory and abnormal proteins (the lon gene), menaquinone biosynthesis (menA), an unknown function of a putative membrane protein (yagF), synthesis of a small hypothetical protein (an intergene region between the two small genes yiiE and yiiF), and the efflux pump of cadaverine and lysine (cadB)...
2007: Microbial Drug Resistance: MDR: Mechanisms, Epidemiology, and Disease
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"