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• Basic Research •     Next Articles

Antibacterial Mechanism and Activity of Caryophyllene against Brochothrix thermosphacta

Hui-Zhen SHU 2, 2, 2, CHEN Wen-Xue2   

  • Received:2019-07-25 Revised:2020-05-12 Online:2020-08-15 Published:2020-08-19
  • Contact: CHEN Wen-Xue E-mail:hnchwx@163.com

Abstract: In this paper, the antibacterial effect and action mechanism of caryophyllene against Brochothrix thermosphacta was studied. The inhibitory activity was investigated by the determination of the minimum inhibitory concentration (MIC) and growth curve of caryophyllene against B. thermosphacta. The damage of cell morphology and cell wall structure by caryophyllene was determined by observing scanning electron microscopy (SEM) and the leakage of alkaline phosphatase (AKP). The effect on the cell membrane was examined by the leakage of potassium ions, fluorescein diacetate (FDA) and proteins. The effect on cell metabolism was investigated by measuring the activity of malate dehydrogenase (MDH) and pyruvate kinase (PK). The binding of caryophyllene to bacterial DNA was studied by fluorescence spectroscopy. The results showed that the MIC of caryophyllene against B. thermosphacta was 5 mL/L. 1×MIC and 2×MIC caryophyllene could destroy the morphology and structure of cells and the permeability of cell membrane, affecting cell metabolism, leading to a significant decrease in MDH and PK activities (P < 0.05), and destroying the conformation and structure of genomic DNA.

Key words: caryophyllene , brochothrix thermosphacta, antibacterial mechanism, malicdehydrogenase(MDH), pyruvate kinase (PK), genomic DNA

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