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首页> 外文期刊>ACS Sustainable Chemistry & Engineering >First Evidence of Cyclodextrin Inclusion Complexes in a Deep Eutectic Solvent
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First Evidence of Cyclodextrin Inclusion Complexes in a Deep Eutectic Solvent

机译：第一证据是深度共晶溶剂中环糊精包合物的综合体

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摘要

Supramolecular host-guest inclusion complexes based on cyclodextrins (CDs) are generally studied in aqueous solutions or more rarely in the presence of a cosolvent. In this study, we investigate for the first time the ability of CDs to retain their host-guest properties in deep eutectic solvents (DESs). Five cyclodextrins were solubilized in mixtures of choline chloride:urea (ChCl:U), and these new solutions were characterized by measuring their viscosity and density as a function of temperature. The heat of dissolution of beta-CD in ChCl:U was measured by calorimetry. The dissolution process exothermic meaning that the interaction between ChCl:U and CD is favorable (enthalpy of dissolution of -23.3 J/g). The ability of CDs to form inclusion complexes with various guests in ChCl:U was demonstrated using two different methods: UV-visible spectroscopy and static headspace gas chromatography. On one hand, the experimental data obtained from the complexation between methyl orange and CDs follows the theoretical fitted curved for a 1:1 inclusion complex. On the other hand, the observed volatility reductions of four volatile organic compounds in different mixtures of ChCl:U:CD were correlated to the CD/guest formation constant values determined in water. These results will certainly contribute to enlarging the applications of CDs in the DES field.
机译：基于环糊精（CDS）的超分子宿主 - 访客包含复合物通常在共溶剂存在下在水溶液中或更少于水溶液中研究。在这项研究中，我们首次调查CDS在深共晶溶剂（DESS）中保留其主机特性的能力。将五个环糊精溶解在氯化胆碱的混合物中：尿素（CHCl：U），并通过测量它们作为温度的函数的粘度和密度来表征这些新溶液。 CHCl中β-CD的溶解热量：通过量热法测量。溶出过程放热意味着CHCl：U和Cd之间的相互作用是有利的（溶解的-23.3J / g的溶解焓）。 CD与CHCL中的各种客体形成包合物的能力：使用两种不同的方法证明了：UV可见光光谱和静态通顶气相色谱法。一方面，从甲基橙和CD之间的络合获得的实验数据遵循理论拟合为1：1夹杂物络合物。另一方面，在CHCl：U：Cd的不同混合物中观察到四种挥发性有机化合物的挥发性减少与水中测定的CD /客观形成常数值相关。这些结果肯定有助于扩大CD在DES领域的应用。

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