Essential Oils and Antimicrobial Activity Open access Peer reviewed

Physicochemical Characterization, Antimicrobial and Antibiofilm Activities of Thymus vulgaris and Rosmarinus officinalis Essential Oil Nanoemulsions with Potential Mouthwash Applications

Cemre İrem Aygüler, Aleyna Ozveren, Timur Hakan Barak, Gamze Benli Yardımcı and 2 more

Pharmaceuticals | Aug 4, 2026

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The findings demonstrate the potential of TV-EO and RO-EO nanoemulsions as promising natural alternatives for mouthwash formulations and highlight the importance of EO composition in determining antimicrobial and antibiofilm efficacy.

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Background/Objectives: In this study, nanoemulsions containing Thymus vulgaris (TV) and Rosmarinus officinalis (RO) essential oils (EOs) were prepared and characterized, and their antibacterial, antifungal, and antibiofilm activities were evaluated against some oral pathogens. Methods: Three nanoemulsions containing 5% TV-EO (F1), 5% RO-EO (F2), and a combination of 2.5% TV-EO and 2.5% RO-EO (F3) were prepared by emulsification followed by high-speed homogenization. Results: Gas chromatography–mass spectrometry coupled with flame ionization detection (GC-MS-FID) analysis revealed linalool (79.51%) as the major constituent of TV-EO and eucalyptol (58.13%), together with camphor (10.80%), as the predominant compounds of RO-EO. All nanoemulsions exhibited nanosized droplets, low polydispersity index (PDI) values (<0.3), and moderate to high colloidal stability. Transmission electron microscopy (TEM) analysis revealed predominantly spherical droplets in all formulations (F1–F3). All formulations exhibited antimicrobial activity against Streptococcus mutans, Lactobacillus acidophilus, Enterococcus faecalis, and Candida albicans. Among the tested formulations, F2 showed the strongest antibacterial activity, whereas F3 exhibited the highest antibiofilm activity against mature S. mutans biofilms, achieving approximately 80% inhibition, comparable to chlorhexidine (CHX). Although F3 possessed the smallest droplet size, its antimicrobial activity was lower than that of F2, suggesting that biological activity was influenced not only by droplet size but also by EO composition. Conclusions: These findings demonstrate the potential of TV-EO and RO-EO nanoemulsions as promising natural alternatives for mouthwash formulations and highlight the importance of EO composition in determining antimicrobial and antibiofilm efficacy.

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Cemre İrem Aygüler

first | Kent Hastanesi | ORCID 0000-0001-9474-3611

Aleyna Ozveren

middle | Acıbadem University

Timur Hakan Barak

middle | Kent Hastanesi | ORCID 0000-0002-7434-3175

Gamze Benli Yardımcı

middle | Afyonkarahisar Sağlık Bilimleri Üniversitesi | ORCID 0000-0002-6469-8116

İpek Tekin

middle | Acıbadem University | ORCID 0000-0001-8547-9185

Müjde Eryılmaz

last | Acıbadem University | ORCID 0000-0003-3760-1996

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BibTeX

@article{Aygler2026Physicochemical,
  title = {Physicochemical Characterization, Antimicrobial and Antibiofilm Activities of Thymus vulgaris and Rosmarinus officinalis Essential Oil Nanoemulsions with Potential Mouthwash Applications},
  author = {Cemre İrem Aygüler and Aleyna Ozveren and Timur Hakan Barak and Gamze Benli Yardımcı and İpek Tekin and Müjde Eryılmaz},
  journal = {Pharmaceuticals},
  year = {2026},
  doi = {10.3390/ph19081229},
  url = {https://doi.org/10.3390/ph19081229}
}

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