For the isolation of selected phenolic compounds from dried chokeberries, natural deep eutectic solvents (NADESs) were investigated as a green alternative to conventionally used extraction solvents. Four types of NADESs were synthesised, with choline chloride as the hydrogen bond acceptor in combination with different hydrogen bond donors (sugars, organic acid and urea). Ultrasound-assisted extraction was used to improve the extractability of the phenolic compounds and the results were compared to those obtained with 80% methanol as the extraction media. The highest values of total phenols and total flavonoids were found in the extract obtained with choline chloride–fructose NADES (36.15 ± 3.39 mg gallic acid g−1 dry weight (DW) and 4.71 ± 0.33 mg rutin g−1 DW, respectively). The extraction recoveries for the individual phenolic compounds depended strongly on the phenolic compound’s structure, with relative mean values between 70% and 97%.

中文翻译：

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基于氯化胆碱的天然深共熔溶剂作为提取介质，用于从苦莓（Aronia Melanocarpa）中提取酚类化合物

为了从干燥的苦莓中分离选定的酚类化合物，研究了天然低共熔溶剂 (NADES) 作为常规使用萃取溶剂的绿色替代品。合成了四种类型的 NADES，以氯化胆碱作为氢键受体，结合不同的氢键供体（糖、有机酸和尿素）。超声辅助提取用于提高酚类化合物的可提取性，并将结果与​​使用 80% 甲醇作为提取介质的结果进行比较。在用氯化胆碱-果糖 NADES 获得的提取物中发现了总酚和总黄酮的最高值（分别为 36.15 ± 3.39 mg 没食子酸 g-1 干重 (DW) 和 4.71 ± 0.33 mg 芦丁 g-1 DW）。