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Current Traditional Medicine

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ISSN (Print): 2215-0838
ISSN (Online): 2215-0846

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Research Article

Synergistic Combinations of Antibiotics with Cumin, Oregano and Rosewood Oils as a Strategy to Preserve the Antibiotic Repertoire

Author(s): Lucy Owen and Katie Laird*

Volume 5, Issue 4, 2019

Page: [337 - 353] Pages: 17

DOI: 10.2174/2215083805666190521102152

Price: $65

Abstract

Background: Formulations employing synergistic combinations of antibiotics with Essential Oils (EOs) could help preserve the antibiotic repertoire by improving their activity against resistant bacteria.

Objective: This study was aimed to screen the antibiotics oxacillin and ciprofloxacin for synergistic interactions with cumin, oregano and rosewood EOs and the EO components cuminaldehyde, carvacrol and linalool against Escherichia coli, Pseudomonas aeruginosa and Staphylococcus aureus (antibiotic sensitive and resistant isolates). This will provide information on formulations with synergistic combinations of EOs and antibiotics that might resensitise antibiotic resistant bacteria.

Methods: Antimicrobial interactions between double and triple combinations of EOs, EO components and antibiotics were determined using the checkerboard method. The most active triple combinations were then assessed by a time-kill assay.

Results: Two synergistic EO-antibiotic combinations and eight additive EO-antibiotic combinations reduced the antibiotic minimum inhibitory concentration below clinical sensitivity breakpoints according to the checkerboard method. However, all the tested combinations were additive according to the time-kill assay; while the combinations completely killed S. aureus, E. coli and P. aeruginosa cells in 2 h. At least one EO compound from the combination alone completely killed the cells of test species.

Conclusion: Positive interactions support the use of EOs or EO components to enhance antibiotic efficacy against antibiotic resistant bacteria. The EO-antibiotic combinations tested by the time kill assay were indifferent; therefore, the observed antimicrobial activity did not arise from synergistic mechanisms as indicated by the checkerboard method. Investigation of other synergistic combinations identified by the checkerboard method could reveal more promising candidates.

Keywords: Essential oil, antibiotic, synergy, Staphylococcus aureus, Pseudomonas aeruginosa, Escherichia coli.

Graphical Abstract

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