Antibiofilm activity and mechanisms of Amomum tsao-ko and clove essential oils against Staphylococcus aureus

Main Article Content

Guoqing Yu
Ming Chen
Zedong Liao
Yi wu Wen
Yixi Zhou
Keshan Lin
Jialin Dai
Min Dai
Fenghui Sun

Keywords

Staphylococcus aureus, biofilm, Amomum tsao-ko oil, clove oil

Abstract

Staphylococcus aureus biofilms significantly threaten public health by causing persistent infections and foodborne diseases. The rise in antibiotic resistance emphasizes the urgent need for effective non-antibiotic control strate-gies. This study evaluated the anti-biofilm potential of Amomum tsao-ko (AEO) and clove (CEO) essential oils against S. aureus NCTC8325. Gas chromatography–mass spectroscopy analysis revealed distinct chemical pro-files, with AEO exhibiting greater diversity. Both essential oils showed potent anti-biofilm activity against S. aureus NCTC8325, effectively preventing biofilm establishment, as confirmed by confocal laser scanning microscopy and scanning electron microscopy. The growth curves and crystal violet staining results demonstrated that AEO and CEO effectively inhibit biofilm formation at concentrations of 91.3 μg/mL and 86.3 μg/mL, respectively, without affecting bacterial growth. Transcriptomic profiling revealed that both AEO and CEO exert anti-biofilm effects through significant regulation of multiple molecular pathways. Interestingly, although the specific pathways influ-enced by AEO and CEO differed, both treatments significantly downregulated the S. aureus infection pathway and the expression of key adhesin protein genes within this pathway. Overall, this study provides critical insights into the phenotypic and transcriptional responses of S. aureus to AEO and CEO, thereby elucidating the molecu-lar basis of their anti-biofilm activities.

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