Laboratory of Microbial Biotechnology and Engineering Enzymes (LMBEE), Center of Biotechnology of Sfax (CBS), University of Sfax, Road of Sidi Mansour Km 6, P.O. Box 1177, Sfax 3018, Tunisia.
Laboratory of Molecular and Cellular Screening Processes, Center of Biotechnology of Sfax, University of Sfax, Road of Sidi Mansour Km 6, P.O. Box 1177, Sfax 3018, Tunisia.
Molecules. 2022 Apr 19;27(9):2630. doi: 10.3390/molecules27092630.
Nowadays, increasing interest has recently been given to the exploration of new food preservatives to avoid foodborne outbreaks or food spoilage. Likewise, new compounds that substitute the commonly used synthetic food preservatives are required to restrain the rising problem of microbial resistance. Accordingly, the present study was conducted to examine the chemical composition and the mechanism(s) of action of the essential oil (CSEO) against Typhimuriumand . The gas chromatography analysis revealed α-pinene (38.47%) and δ-3-carene (25.14%) are the major components of the CSEO. By using computational methods, such as quantitative structure-activity relationship (QSAR), we revealed that many CSEO components had no toxic effects. Moreover, findings indicated that α-pinene, δ-3-carene and borneol, a minor compound of CSEO, could inhibit the AcrB-TolC and MepR efflux pump activity of Typhimurium and , respectively. In addition, our molecular docking predictions indicated the high affinity of these three compounds with active sites of bacterial DNA and RNA polymerases, pointing to plausible impairments of the pathogenic bacteria cell replication processes. As well, the safety profile was developed through the zebrafish model. The in vivo toxicological evaluation of (CSEO) exhibited a concentration-dependent manner, with a lethal concentration (LC) equal to 6.6 µg/mL.
如今，人们越来越关注探索新的食品防腐剂，以避免食源性疾病爆发或食品变质。同样，需要新的化合物来替代常用的合成食品防腐剂，以遏制微生物耐药性日益严重的问题。因此，本研究旨在研究精油（CSEO）对鼠伤寒沙门氏菌和 的化学组成和作用机制。气相色谱分析显示，α-蒎烯（38.47%）和δ-3-蒈烯（25.14%）是 CSEO 的主要成分。通过使用定量构效关系（QSAR）等计算方法，我们发现许多 CSEO 成分没有毒性作用。此外，研究结果表明，α-蒎烯、δ-3-蒈烯和龙脑，CSEO 的一种次要成分，可以抑制鼠伤寒沙门氏菌和 的 AcrB-TolC 和 MepR 外排泵活性。此外，我们的分子对接预测表明，这三种化合物与细菌 DNA 和 RNA 聚合酶的活性位点具有高亲和力，表明可能会损害致病菌的细胞复制过程。同样，通过斑马鱼模型开发了安全性概况。（CSEO）的体内毒理学评价呈浓度依赖性，致死浓度（LC）等于 6.6µg/mL。
