Abstract The present study aims to determine the chemical composition of essential oil (EO) and hydrolat extract (HE) of aerial parts of T. capitata (L.) Cav. from Morocco, to evaluate their antibacterial activity against four bacterial strains: Gram- (E. coli, Pr. Mirabilis) and Gram+ (B.subtilis, S. aureus), as well as their corrosion inhibiting powers against aluminum alloy (AA6063) in 3 % sodium chloride medium using two methods: the potentiodynamic polarization and impedance spectroscopy (EIS) measurements. The results showed that carvacrol (83.6 %) is the most dominant compound of T. capitata (L.) Cav EO followed by p-cymene (5.4 %) and α-humulene (3.5 %), while the T. capitata (L.) Cav HE almost consists of carvacrol (98.5 %) alongside some compounds in the form of traces. Both oils showed significant antibacterial activities against the bacterial strains tested. The T. capitata (L.) Cav EO has shown an inhibition efficiency of 74.52 % at a concentration of 2 g/L, while the T. capitata (L.) Cav HE has shown an inhibition efficiency of 85.55 % at the same concentration. Keys words: T. capitata (L.) Cav.; essential oil; hydrolat; potentiodynamic polarization; impedance spectroscopy; antibacterial activity; corrosion inhibition

中文翻译：

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来自摩洛哥北部收获的 Thymbra capitalata (L.) Cav 地上部分的精油和水提取物的化学成分、体外抗菌活性和腐蚀抑制

摘要 本研究旨在确定 T. capitalata (L.) Cav. 地上部分的精油 (EO) 和水精提取物 (HE) 的化学成分。来自摩洛哥，评估它们对四种细菌菌株的抗菌活性：革兰氏 -（大肠杆菌，Pr. Mirabilis）和革兰氏 +（枯草芽孢杆菌，金黄色葡萄球菌），以及它们对铝合金 (AA6063) 的腐蚀抑制能力3 % 氯化钠介质使用两种方法：动电位极化和阻抗谱 (EIS) 测量。结果表明，香芹酚 (83.6 %) 是香芹酚 (L.) Cav EO 的最主要化合物，其次是对伞花烃 (5.4 %) 和 α-葎草烯 (3.5 %)，而香芹籽 (L.) Cav EO 其次是对伞花烃 (5.4 %) 和 α-葎草烯 (3.5 %)。 ) Cav HE 几乎由香芹酚 (98.5%) 和一些痕量形式的化合物组成。两种油都对所测试的细菌菌株显示出显着的抗菌活性。T. capita (L.) Cav EO 在 2 g/L 的浓度下显示出 74.52 % 的抑制效率，而 T. capita (L.) Cav HE 在相同浓度下显示出 85.55 % 的抑制效率. 关键词：T.capitata (L.) Cav.；香精油; 水解; 动电位极化；阻抗谱；抗菌活性；缓蚀