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首页> 外文期刊>Applied Microbiology >Induction of Fatty Acid Composition Modifications and Tolerance to Biocides in Salmonella enterica Serovar Typhimurium by Plant-Derived Terpenes
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Induction of Fatty Acid Composition Modifications and Tolerance to Biocides in Salmonella enterica Serovar Typhimurium by Plant-Derived Terpenes

机译：植物源萜类化合物诱导肠道小肠沙门氏菌中脂肪酸组成的修饰及其对杀生物剂的耐受性

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摘要

To enhance food safety and stability, the food industry tends to use natural antimicrobials such as plant-derived compounds as an attractive alternative to chemical preservatives. Nonetheless, caution must be exercised in light of the potential for bacterial adaptation to these molecules, a phenomenon previously observed with other antimicrobials. The aim of this study was to characterize the adaptation of Salmonella enterica serovar Typhimurium to sublethal concentrations of four terpenes extracted from aromatic plants: thymol, carvacrol, citral, and eugenol, or combinations thereof. Bacterial adaptation in these conditions was demonstrated by changes in membrane fatty acid composition showing (i) limitation of the cyclization of unsaturated fatty acids to cyclopropane fatty acids when cells entered the stationary phase and (ii) bacterial membrane saturation. Furthermore, we demonstrated an increased cell resistance to the bactericidal activity of two biocides (peracetic acid and didecyl dimethyl ammonium bromide). The implications of membrane modifications in terms of hindering the penetration of antimicrobials through the bacterial membrane are discussed.
机译：为了提高食品安全性和稳定性，食品工业倾向于使用天然抗菌剂（例如植物衍生的化合物）作为化学防腐剂的有吸引力的替代品。但是，必须谨慎考虑细菌对这些分子的适应能力，这是以前在其他抗菌药中观察到的现象。这项研究的目的是表征小肠沙门氏菌鼠伤寒沙门氏菌对从芳香植物中提取的四种萜烯的致死浓度的适应性：百里香酚，香芹酚，柠檬醛和丁子香酚，或其组合。在这些条件下细菌的适应性表现为膜脂肪酸组成的变化，表明（i）当细胞进入固定相时，不饱和脂肪酸环化成环丙烷脂肪酸的限制和（ii）细菌膜饱和。此外，我们证明了细胞对两种杀菌剂（过氧乙酸和二癸基二甲基溴化铵）的杀菌活性具有更高的抵抗力。讨论了膜修饰在阻止抗菌剂穿过细菌膜渗透方面的意义。

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