Antimicrobial activity of commercial Olea europaea (olive) leaf extract
Abstract
The aim of this research was to investigate the activity of a commercial extract derived from the leaves of Olea europaea (olive) against a wide range of microorganisms (n=122). Using agar dilution and broth microdilution techniques, olive leaf extract was found to be most active against Campylobacter jejuni, Helicobacter pylori and Staphylococcus aureus [including meticillin-resistant S. aureus (MRSA)], with minimum inhibitory concentrations (MICs) as low as 0.31-0.78% (v/v). In contrast, the extract showed little activity against all other test organisms (n=79), with MICs for most ranging from 6.25% to 50% (v/v). In conclusion, olive leaf extract was not broad-spectrum in action, showing appreciable activity only against H. pylori, C. jejuni, S. aureus and MRSA. Given this specific activity, olive leaf extract may have a role in regulating the composition of the gastric flora by selectively reducing levels of H. pylori and C. jejuni.
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The antimicrobial and antioxidant efficiency of olive leaf extracts are directly related with their content of polyphenols.
“Studies report that the antimicrobial and antioxidant efficiency of the olive leaf extracts are directly related with their content of polyphenols [18,20,33,34].”
From Comparison of Techniques and Solvents on the Antimicrobial and Antioxidant Potential of Extracts from Acacia dealbata and Olea europaea (2020) · cites this paper as [20]
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References 13 · Cited by 325
- Authors
- Sudjana, A. N., D’Orazio, C., Ryan, V., Rasool, N., Ng, J., Islam, N., Riley, T. V., & Hammer, K. A.
- Affiliations
- The University of Western Australia (AU)
- The University of Notre Dame Australia (AU)
- Venue
- International Journal of Antimicrobial Agents
- Publisher
- Elsevier BV
- Published
- 2009-05
- Volume
- 33
- Issue
- 5
- Pages
- 461-463
- ISSN
- 0924-8579 (ISSN-L)
- OpenAlex
- W1994866392
- Cited by
- 325
- References
- 13
- Citations by year
- 2026: 6 · 2025: 20 · 2024: 19 · 2023: 18 · 2022: 22 · 2021: 28 · 2020: 28 · 2019: 27 · 2018: 21 · 2017: 24 · 2016: 22 · 2015: 15 · 2014: 21 · 2013: 10 · 2012: 14
- FWCI
- 23.31
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- International Journal of Antimicrobial Agents (publishedVersion)
- PubMed (publishedVersion)
- Murdoch University Research Portal (submittedVersion)
- UWA Profiles and Research Repository (UWA) (submittedVersion)
- ResearchOnline@ND (The University of Notre Dame) (submittedVersion)
- Funders
- Raine Medical Research Foundation
- Topics
- Life Sciences › Agricultural and Biological Sciences › Food Science › Essential Oils and Antimicrobial Activity
- Physical Sciences › Chemistry › Organic Chemistry › Edible Oils Quality and Analysis
- Life Sciences › Agricultural and Biological Sciences › Plant Science › Medicinal Plant Research
- Keywords
- Olea europaea, olive leaf extract, antimicrobial activity, Campylobacter jejuni, Helicobacter pylori, Staphylococcus aureus, methicillin-resistant Staphylococcus aureus, minimum inhibitory concentration
- MeSH terms
- Anti-Infective Agents, Gram-Negative Bacteria, Gram-Positive Bacteria, Humans, Microbial Sensitivity Tests, Plant Extracts, Staphylococcus aureus, Campylobacter jejuni, Helicobacter pylori, Plant Leaves, Olea, Methicillin-Resistant Staphylococcus aureus
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