Dielectric barrier discharge (DBD) cold plasma (CP) was used for surface treatment of fennel (Foeniculum vulgare Mill.) seeds and spearmint (Mentha spicata L.) leaves, followed by hydro-distillation, to enhance essential oil (EO) yield extraction. Response Surface Methodology (RSM) was applied to optimize the EOs yields extraction. The experiments were designed using the central composite design (CCD) with two independent variables: X1: exposure times (5-15 min); and X2: applied voltage values (17-23 kV). The EOs yields were enhanced by small defects, generated on the fennel seed coat and spearmint leaf surface. The optimum yield was achieved at 10 min exposure time, and 19 kV applied voltage, by 1.83 (% v/w) and 1.81 (% v/w), considering fennel and spearmint, respectively. No remarkable changes in EOs compositions were observed concerning both materials. The result revealed the usefulness and effectiveness of the novel methodology of DBD-CP assisted hydro-distillation in EO extraction in fennel seeds and spearmints leaves; while maintaining its compositions.

介电势垒放电（DBD）冷等离子体（CP）用于茴香（Foeniculum vulgare Mill。）种子和留兰香（Mentha spicata）的表面处理L.）叶，然后进行水蒸馏，以提高精油（EO）的提取率。应用响应面方法（RSM）来优化EOs的提取率。实验是使用具有两个独立变量的中央复合设计（CCD）进行设计的：X1：曝光时间（5-15分钟）；X2：施加的电压值（17-23 kV）。茴香籽皮和留兰香叶表面产生的小缺陷提高了EOs的产量。分别考虑茴香和留兰香，在10分钟的暴露时间和19 kV的施加电压下，最佳产量分别达到1.83（％v / w）和1.81（％v / w）。两种材料均未观察到EOs组成的显着变化。结果表明，DBD-CP辅助水蒸馏的新方法在茴香种子和留兰香叶的EO萃取中是有用和有效的。同时保持其成分。