The main products obtained from citrus wastes are pectin and essential oil. In this work, ohmic heating assisted extraction/hydrodistillation (OHAE/H) was applied for the simultaneous recovery of pectin and essential oil from lemon waste. Optimum OHAE/H conditions to maximize the yield of pectin and essential oil were determined with response surface methodology. Three independent variables, namely liquid to solid ratio (w:v), extraction/hydrodistillation time (min) and voltage gradient (V/cm) were varied to obtain maximum pectin and essential oil yield. Optimum OHAE/H conditions were determined as 8.7:1 liquid to solid ratio, 58.4 min extraction/hydrodistillation time and 14.2 V/cm voltage gradient. The predicted pectin and essential oil yields at optimum conditions were 16.58 and 3.62 g/100 g lemon waste, respectively. Data analysis showed that all of the independent variables significantly affected the pectin and essential oil yield. In the verification study, close agreement was found between predicted and experimental values. Conventional heating extraction/hydrodistillation (CHE/H) were conducted to evaluate the effectivity of OHAE/H. With OHAE/H process, the yields of the pectin and essential oil were significantly increased when compared to CHE/H. Limonene concentration of the essential oil produced with OHAE/H was higher than the essential oil produced by CHE/H. Results demonstrate that the single-step OHAE/H could be an effective method for simultaneous extraction and hydrodistillation of pectin and essential oils.

从柑橘废料中获得的主要产品是果胶和精油。在这项工作中，欧姆加热辅助萃取/水蒸馏 (OHAE/H) 被应用于从柠檬废物中同时回收果胶和精油。使用响应面方法确定了使果胶和精油产量最大化的最佳 OHAE/H 条件。改变三个独立变量，即液固比 (w:v)、萃取/水蒸馏时间 (min) 和电压梯度 (V/cm)，以获得最大的果胶和精油产量。最佳 OHAE/H 条件确定为 8.7:1 的液固比、58.4 分钟的萃取/水蒸馏时间和 14.2 V/cm 的电压梯度。在最佳条件下，预测的果胶和精油产量分别为 16.58 和 3.62 克/100 克柠檬废料。数据分析表明，所有自变量均显着影响果胶和精油产量。在验证研究中，预测值和实验值之间非常吻合。进行常规加热萃取/加氢蒸馏 (CHE/H) 以评估 OHAE/H 的有效性。与 CHE/H 相比，OHAE/H 工艺的果胶和精油的产量显着增加。用 OHAE/H 生产的精油的柠檬烯浓度高于用 CHE/H 生产的精油。结果表明，单步 OHAE/H 可能是同时提取和水蒸馏果胶和精油的有效方法。在预测值和实验值之间发现了密切的一致性。进行常规加热萃取/加氢蒸馏 (CHE/H) 以评估 OHAE/H 的有效性。与 CHE/H 相比，OHAE/H 工艺的果胶和精油的产量显着增加。用 OHAE/H 生产的精油的柠檬烯浓度高于用 CHE/H 生产的精油。结果表明，单步 OHAE/H 可能是同时提取和水蒸馏果胶和精油的有效方法。在预测值和实验值之间发现了密切的一致性。进行常规加热萃取/加氢蒸馏 (CHE/H) 以评估 OHAE/H 的有效性。与 CHE/H 相比，OHAE/H 工艺的果胶和精油的产量显着增加。用 OHAE/H 生产的精油的柠檬烯浓度高于用 CHE/H 生产的精油。结果表明，单步 OHAE/H 可能是同时提取和水蒸馏果胶和精油的有效方法。用 OHAE/H 生产的精油的柠檬烯浓度高于用 CHE/H 生产的精油。结果表明，单步 OHAE/H 可能是同时提取和水蒸馏果胶和精油的有效方法。用 OHAE/H 生产的精油的柠檬烯浓度高于用 CHE/H 生产的精油。结果表明，单步 OHAE/H 可能是同时提取和水蒸馏果胶和精油的有效方法。