The impact of pulsed electric field (PEF) treatment on orange, pomelo, and lemon in aqueous media was studied. Whole fruits and stack of peels were PEF treated at electric field strength of 3 kV/cm and 10 kV/cm, respectively. The PEF induced damage of the whole fruit was evaluated by different disintegration indexes. The PEF treatment increased the yield of juice obtained after pressing by 25% for orange, 37% for pomelo, and 59% for lemon. The effect of PEF on different parts of each fruit was studied. Flavedo and albedo were separated from the untreated fruit or PEF treated fruit and solvent extraction (1/1 ethanol/water solution) of polyphenols was conducted. The quantification and characterization of polyphenols in each part was compared for untreated and PEF treated fruit. The application of high electric field strength on orange peels enhanced the extraction of polyphenols up to 22 mg GAE/g DM.

Industrial relevance

Citrus fruits are valuable sources of bioactive compounds (vitamins, antioxidants, carotenoids and flavonoids) and their processing represents an industrial importance. An application of PEF to whole fruits may be useful for improving the efficiency of juice extraction from different citrus fruits. The concentration of polyphenols in the extracted juice could be significantly enhanced by the treatment of citrus peels with PEF at high electric field strength.

中文翻译：

---

脉冲电场处理柑橘类水果：改善果汁和多酚的提取

研究了脉冲电场（PEF）处理对水性介质中橙，柚和柠檬的影响。用电场强度分别为3 kV / cm和10 kV / cm的PEF处理整个果实和果皮堆栈。用不同的崩解指数评价PEF对整个水果的伤害。PEF处理将压榨后的橙汁，柚子和柠檬分别提高了25％，37％和59％。研究了PEF对每种水果不同部位的影响。从未经处理的水果或经PEF处理的水果中分离出Flavedo和反照率，并进行了多酚的溶剂萃取（1/1乙醇/水溶液）。比较了未经处理和经PEF处理的水果各部分中多酚的定量和特征。

行业相关性

柑橘类水果是生物活性化合物（维生素，抗氧化剂，类胡萝卜素和类黄酮）的重要来源，其加工具有工业重要性。在整个水果中使用PEF可能有助于提高从不同柑橘类水果中提取汁液的效率。通过在高电场强度下用PEF处理柑桔皮可以显着提高提取汁中多酚的浓度。