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Hydrophobic Eutectic Solvent with Antioxidant Properties: Application for the Dispersive Liquid–Liquid Microextraction of Fat-Soluble Micronutrients from Fruit Juices
ACS Sustainable Chemistry & Engineering ( IF 8.4 ) Pub Date : 2021-06-04 , DOI: 10.1021/acssuschemeng.1c01473 Chiara Dal Bosco 1 , Valerio Di Lisio 1 , Paola D’Angelo 1 , Alessandra Gentili 1
ACS Sustainable Chemistry & Engineering ( IF 8.4 ) Pub Date : 2021-06-04 , DOI: 10.1021/acssuschemeng.1c01473 Chiara Dal Bosco 1 , Valerio Di Lisio 1 , Paola D’Angelo 1 , Alessandra Gentili 1
Affiliation
Despite the great interest devoted to eutectic solvents with significant negative deviations from ideality (namely, deep eutectic solvents), many hydrophobic liquid mixtures are ideal or quasi-ideal systems. In this regard, we propose the introduction of a hydrophobic eutectic solvent based on l-menthol and butylated hydroxytoluene, blended in a molar ratio of 3:1. The physicochemical characterization by means of differential scanning calorimetry and infrared spectroscopy has identified that it is an ideal eutectic solvent. Compared to other hydrophobic mixtures, this one represents an advanced solvent system due to its intrinsic antioxidant activity, which makes it an ideal green choice for the extraction and preservation of easily oxidizable lipophilic compounds. In order to evaluate its efficiency, it was applied for the first time as an extractant for the dispersive liquid–liquid microextraction of carotenoids and fat-soluble vitamins from fruit juices, carried out at 298 K. All extracts were analyzed by high-performance liquid chromatography–tandem mass spectrometry. The developed method was then validated, providing precise (4–8%) and accurate (4–6%) results on a commercial fruit juice containing declared values of β-carotene and α-tocopherol acetate. Recoveries were ≥70%, while the detection limits were 0.05 μg L–1 for β-carotene and 0.28 μg L–1 for α-tocopherol acetate. Here, we also propose an original approach to properly determine the antioxidant activity of eutectic mixtures since the available commercial kits cannot be applied to such systems without altering their nature. Last but not least, a circular process of reuse of this ideal eutectic solvent has been developed using a low-cost activated carbon material obtained from coconut shells.
中文翻译:
具有抗氧化特性的疏水性共晶溶剂:分散液-液微萃取果汁中脂溶性微量元素的应用
尽管人们对与理想有显着负偏差的共晶溶剂(即深共晶溶剂)非常感兴趣,但许多疏水液体混合物是理想或准理想系统。在这方面,我们建议引入基于l的疏水性共晶溶剂-薄荷醇和丁基化羟基甲苯,以 3:1 的摩尔比混合。通过差示扫描量热法和红外光谱法的物理化学表征确定它是一种理想的共晶溶剂。与其他疏水混合物相比,由于其固有的抗氧化活性,该混合物代表了一种先进的溶剂系统,这使其成为提取和保存易氧化亲脂性化合物的理想绿色选择。为了评估其效率,首次将其作为萃取剂用于果汁中类胡萝卜素和脂溶性维生素的分散液-液微萃取,在 298 K 下进行。所有提取物均采用高效液相分析色谱-串联质谱。然后验证开发的方法,提供精确 (4–8%) 和准确 (4–6%) 的商业果汁结果,其中包含 β-胡萝卜素和 α-生育酚醋酸酯的声明值。回收率≥70%,而检测限为0.05 μg L-1用于β胡萝卜素和0.28微克大号-1为α生育酚醋酸酯。在这里,我们还提出了一种原始方法来正确确定共晶混合物的抗氧化活性,因为可用的商业试剂盒不能在不改变其性质的情况下应用于此类系统。最后但并非最不重要的一点是,使用从椰子壳中获得的低成本活性炭材料开发了一种循环再利用这种理想共晶溶剂的工艺。
更新日期:2021-06-21
中文翻译:
具有抗氧化特性的疏水性共晶溶剂:分散液-液微萃取果汁中脂溶性微量元素的应用
尽管人们对与理想有显着负偏差的共晶溶剂(即深共晶溶剂)非常感兴趣,但许多疏水液体混合物是理想或准理想系统。在这方面,我们建议引入基于l的疏水性共晶溶剂-薄荷醇和丁基化羟基甲苯,以 3:1 的摩尔比混合。通过差示扫描量热法和红外光谱法的物理化学表征确定它是一种理想的共晶溶剂。与其他疏水混合物相比,由于其固有的抗氧化活性,该混合物代表了一种先进的溶剂系统,这使其成为提取和保存易氧化亲脂性化合物的理想绿色选择。为了评估其效率,首次将其作为萃取剂用于果汁中类胡萝卜素和脂溶性维生素的分散液-液微萃取,在 298 K 下进行。所有提取物均采用高效液相分析色谱-串联质谱。然后验证开发的方法,提供精确 (4–8%) 和准确 (4–6%) 的商业果汁结果,其中包含 β-胡萝卜素和 α-生育酚醋酸酯的声明值。回收率≥70%,而检测限为0.05 μg L-1用于β胡萝卜素和0.28微克大号-1为α生育酚醋酸酯。在这里,我们还提出了一种原始方法来正确确定共晶混合物的抗氧化活性,因为可用的商业试剂盒不能在不改变其性质的情况下应用于此类系统。最后但并非最不重要的一点是,使用从椰子壳中获得的低成本活性炭材料开发了一种循环再利用这种理想共晶溶剂的工艺。