Antibacterial activity and chemicaL constitutions of Olea europaea L. leaf extracts
Abstract
ABSTRACT The in vitro antimicrobial activity of aqueous, acetone, diethyl ether and ethyl alcohol extracts of olive leaves (Olea europaea L.) was studied. The aqueous extract of olive leaves had no antibacterial effect against the test microorganisms, whereas acetone extract showed inhibitory effect on Salmonella enteritidis, Bacillus cereus, Klebsiella pneumoniae, Escherichia coli, Enterococcus faecalis, Streptococcus thermophilus and Lactobacillus bulgaricus. Furthermore, the antimicrobial activities of some phenolic compounds against microorganisms were tested. The most effective compound was found to be oleuropein while syringic acid was found ineffective. The characterization of phenolic compounds in different extracts determined by high performance liquid chromatography-air pressure chemical ionization-mass spectrometry detector (HPLC-APCI-MSD GC-MS) gas chromatography-mass spectrometry (GC-MS). The acetone and the ethyl alcohol extracts had the most and the least oleuropein content, respectively. PRACTICAL APPLICATIONS In recent years the extracts of many plant species have become popular, and attempts to characterize their bioactive principles have gained speed for many pharmaceutical and food-processing applications. Especially, antimicrobial properties of plants have revived as a consequence of current problems associated with the use of chemical preservatives. Because of consumers' negative perspectives of synthetic preservatives, attention is shifting toward natural alternatives. The findings suggest that olive leaf extracts and their phenolic compounds have good potential as antibacterial substances in food preservation as they may be more acceptable to consumers and the regulatory agencies in comparison with synthetic chemical compounds.
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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 [33]
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“[33] also reported that the inhibitory effects of 16 the olive extracts increased with increasing concentration.”
BackgroundMethodInfluential
- Authors
- KORUKLUOGLU, M., SAHAN, Y., YIGIT, A., OZER, E. T., & GÜCER, S.
- Venue
- Journal of Food Processing and Preservation
- Publisher
- Hindawi Limited
- Published
- 2010-01-05
- Volume
- 34
- Issue
- 3
- Pages
- 383-396
- ISSN
- 0145-8892 (ISSN-L)
- 1745-4549
- OpenAlex
- W1792057742
- Cited by
- 67
- References
- 33
- Citations by year
- 2026: 3 · 2025: 4 · 2024: 9 · 2023: 4 · 2022: 4 · 2021: 7 · 2020: 8 · 2019: 5 · 2018: 3 · 2017: 5 · 2016: 6 · 2015: 3 · 2014: 1 · 2013: 2 · 2012: 1
- FWCI
- 2.45
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Journal of Food Processing and Preservation (publishedVersion)
- Bursa Uludag University - AVESIS (submittedVersion)
- Topics
- Life Sciences › Agricultural and Biological Sciences › Food Science › Essential Oils and Antimicrobial Activity
- Physical Sciences › Chemistry › Organic Chemistry › Edible Oils Quality and Analysis
- Health Sciences › Medicine › Biochemistry › Phytochemicals and Antioxidant Activities
- Keywords
- Olea europaea, olive leaf extract, antibacterial activity, phenolic compounds, oleuropein, syringic acid, food preservatives, natural antimicrobials, Salmonella Enteritidis, Lactobacillus bulgaricus, Enterococcus faecalis, plant extracts
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