Inhibition and Inactivation of Listeria monocytogenes and Escherichia coli O157:H7 Colony Biofilms by Micellar-Encapsulated Eugenol and Carvacrol

The antimicrobial efficacy of carvacrol and eugenol, two essential oil compounds, encapsulated in a micellar nonionic surfactant solution on four strains of Listeria monocytogenes (Scott A, 101, 108, and 310) and four strains of Escherichia coli O157:H7 (H1730, E0019, F4546, and 932) growing as colo...

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Bibliographic Details
Published in:Journal of food protection 2006-12, Vol.69 (12), p.2947-2954
Main Authors: Perez-Conesa, D, McLandsborough, L, Weiss, J
Format: Article
Language:English
Subjects:
Anti-Bacterial Agents - pharmacology
antibacterial properties
bacterial contamination
biofilm
Biofilms - growth & development
Biological and medical sciences
carvacrol
Colony Count, Microbial
Consumer Product Safety
Cymenes
Dose-Response Relationship, Drug
encapsulation
Escherichia coli
Escherichia coli O157 - drug effects
Escherichia coli O157 - physiology
Escherichia coli O157:H7
essential oils
Eugenol
food contact surfaces
food contamination
Food industries
Food Microbiology
food pathogens
Food Preservation - methods
food preservatives
Fundamental and applied biological sciences. Psychology
Listeria monocytogenes
Listeria monocytogenes - drug effects
Listeria monocytogenes - physiology
Micelles
Microbial Sensitivity Tests
Monoterpenes
nonionic surfactants
plant extracts
Time Factors
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Summary:The antimicrobial efficacy of carvacrol and eugenol, two essential oil compounds, encapsulated in a micellar nonionic surfactant solution on four strains of Listeria monocytogenes (Scott A, 101, 108, and 310) and four strains of Escherichia coli O157:H7 (H1730, E0019, F4546, and 932) growing as colony biofilms was investigated. Carvacrol and eugenol were encapsulated in Surfynol 485W at concentrations ranging from 0.3 to 0.9% (wt/wt) at a surfactant concentration of 5% (wt/wt). Colony biofilms were grown on polycarbonate membranes resting on agar plates containing antimicrobial formulations. Cells were enumerated after 0, 3, 6, 9, 24, 48, and 72 h of incubation. Colony biofilms of all E. coli O157:H7 strains were more sensitive to both antimicrobial systems than L. monocytogenes strains. Surface-grown E. coli O157:H7 viable cell numbers decreased below detectable levels after exposure to encapsulated essential oil compounds for >3 h at all tested concentrations, except for E. coli O157:H7 F4546, which grew slowly in the presence of
ISSN:0362-028X
1944-9097
DOI:10.4315/0362-028x-69.12.2947