Disinfectant test against monoculture and mixed-culture biofilms composed of technological, spoilage and pathogenic bacteria: Bactericidal effect of essential oil and hydrosol of Satureja thymbra and comparison with standard acid-base sanitizers
Abstract
AIMS: To assess the antimicrobial action of three natural-derived products (essential oil, decoction and hydrosol of Satureja thymbra) against biofilms, composed of useful, spoilage and pathogenic bacteria (formed as monoculture or/and mixed-culture), and to compare their efficiency with three standard acid and alkaline chemical disinfectants. METHODS AND RESULTS: Two acids (hydrochloric and lactic, pH 3), one alkali (sodium hydroxide, pH 11), the essential oil of S. thymbra (1% v/v) and the two by-products of the essential oil purification procedure (the decoction and the hydrosol fraction of essential oil, 100%), were tested against biofilms formed by five bacterial species, either as monospecies, or as mixed-culture of all species. The tested bacterial species were Staphylococcus simulans and Lactobacillus fermentum (useful technological bacteria), Pseudomonas putida (spoilage bacterium), Salmonella enterica and Listeria monocytogenes (pathogenic bacteria). Biofilms were left to be formed on stainless steel coupons for 5 days at 16 degrees C, before the application of disinfection treatments, for 60 and 180 min. The disinfection efficiency was evaluated by detaching the remaining viable biofilm cells and enumerating them by agar plating, as well as by automated conductance measurements (using Rapid Automated Bacterial Impedance Technique). Both these methods revealed that the essential oil and the hydrosol of S. thymbra exhibited a strong antimicrobial action against both monospecies and mixed-culture biofilms. Surprisingly, the efficiency of the other three acid-base disinfectants was not adequate, although a long antimicrobial treatment was applied (180 min). CONCLUSIONS: The essential oil of S. thymbra (1%), as well as its hydrosol fraction (100%), presents sufficient bactericidal effect on bacterial biofilms formed on stainless steel. SIGNIFICANCE AND IMPACT OF THE STUDY: Use of natural antimicrobial agents could provide alternative or supplemented ways for the disinfection of microbial-contaminated industrial surfaces.
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Essential oils contain a wide variety of secondary metabolites capable of inhibiting or slowing the growth of bacteria, yeasts and moulds.
“EOs contain a wide series of secondary metabolites that can inhibit or slow the growth of bacteria, yeasts and moulds [3,4,5].”
From Effect of essential oils on pathogenic bacteria (2013) · cites this paper as [3]
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Effect of essential oils on pathogenic bacteria
Nazzaro, F., Fratianni, F., De Martino, L., Coppola, R., & De Feo, V. (2013) · Pharmaceuticals · doi:10.3390/ph6121451 · Cited by 2,186 · see citing works
“Most EOs have a more powerful effect on Gram-positive bacteria than Gram-negative species, and this effect is most likely due to differences in the cell membrane compositions (Figure 1) [3,56,58].”
BackgroundApplication of natural antimicrobials for food preservation
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Aćimović, M., Tešević, V., Smiljanić, K., Cvetković, M., Stanković, J., Kiprovski, B., & Sikora, V. (2020) · Advanced Technologies · doi:10.5937/savteh2002054a · Cited by 121 · see citing works
- Authors
- Chorianopoulos, N. G., Giaouris, E. D., Skandamis, P. N., Haroutounian, S. A., & Nychas, G.-J. E.
- Affiliations
- Agricultural University of Athens (GR)
- Corresponding author
- Giaouris, E.D.
- Venue
- Journal of Applied Microbiology
- Publisher
- Oxford University Press (OUP)
- Published
- 2008-06
- Volume
- 104
- Issue
- 6
- Pages
- 1586-1596
- ISSN
- 1364-5072 (ISSN-L)
- 1365-2672
- OpenAlex
- W1973191374
- Cited by
- 202
- References
- 57
- Citations by year
- 2026: 6 · 2025: 4 · 2024: 5 · 2023: 15 · 2022: 17 · 2021: 13 · 2020: 12 · 2019: 15 · 2018: 11 · 2017: 18 · 2016: 11 · 2015: 15 · 2014: 8 · 2013: 13 · 2012: 15
- FWCI
- 12.80
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Journal of Applied Microbiology (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Life Sciences › Agricultural and Biological Sciences › Food Science › Essential Oils and Antimicrobial Activity
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Bacterial biofilms and quorum sensing
- Physical Sciences › Chemistry › Organic Chemistry › Antimicrobial agents and applications
- Keywords
- Satureja thymbra, essential oils, hydrosols, biofilm disinfection, mixed-culture biofilms, natural antimicrobials, stainless steel surfaces, Staphylococcus simulans, Lactobacillus fermentum, Pseudomonas putida, Salmonella enterica, Listeria monocytogenes, bactericidal activity
- MeSH terms
- Bacteria, Disinfectants, Disinfection, Equipment Contamination, Humans, Hydrochloric Acid, Hydrogen-Ion Concentration, Industrial Microbiology, Oils, Volatile, Stainless Steel, Biofilms, Lactic Acid, Hydrogels, Plant Preparations, Satureja
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