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<p>This study investigated the antimicrobial activity and underlying inactivation mechanisms of <i>Quercus phillyraeoides</i> essential oil (QP-EO) against <i>Staphylococcus aureus</i>. Results of the disk diffusion assay demonstrated the potent antimicrobial activity of QP-EO (zone of inhibition, 11.97–12.08&#xa0;mm). The minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) of QP-EO against <i>S. aureus</i> was 1.25&#xa0;mg/mL, indicating its potential bactericidal properties. This similar MIC and MBC values suggests that QP-EO induces irreversible damage at specific concentrations. In addition, transmission electron microscopy revealed that QP-EO induces cell shape distortion and cell wall rupture in <i>S. aureus</i>, which may be caused by the small essential oil particles. QP-EO also significantly inhibited <i>S. aureus</i> initial biofilm formation and reduced the cell mass of preformed biofilms, suggesting its potential in controlling biofilm-associated infections. These findings highlight the efficacy of QP-EO as a natural antimicrobial and antibiofilm agent, with implications for microbial control and food safety.</p>

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Evaluation of the antimicrobial and antibiofilm properties of Quercus phillyraeoides essential oil against Staphylococcus aureus

  • 期刊论文

  • 发表日期：

    2025年7月20日

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  • Ye-Seul Yun,
  • Soo-Hwan Kim,
  • Sang-Hyun Park

摘要

This study investigated the antimicrobial activity and underlying inactivation mechanisms of Quercus phillyraeoides essential oil (QP-EO) against Staphylococcus aureus. Results of the disk diffusion assay demonstrated the potent antimicrobial activity of QP-EO (zone of inhibition, 11.97–12.08 mm). The minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) of QP-EO against S. aureus was 1.25 mg/mL, indicating its potential bactericidal properties. This similar MIC and MBC values suggests that QP-EO induces irreversible damage at specific concentrations. In addition, transmission electron microscopy revealed that QP-EO induces cell shape distortion and cell wall rupture in S. aureus, which may be caused by the small essential oil particles. QP-EO also significantly inhibited S. aureus initial biofilm formation and reduced the cell mass of preformed biofilms, suggesting its potential in controlling biofilm-associated infections. These findings highlight the efficacy of QP-EO as a natural antimicrobial and antibiofilm agent, with implications for microbial control and food safety.