Research Progress on Deep Eutectic Solvents and Recent Applications

In this study, the classification, composition, preparation methods, and performance parameters of deep eutectic solvents (DESs) their recent applications in natural product extraction, drug delivery systems, trace metal determination, nanomaterial synthesis, electrochemistry are systematically summarised through literature decades, using DESs as keywords. The hydrogen bond acceptors (HBA) mainly quaternary ammonium salts (e.g., choline chloride) or amphoteric ions betaine); donors (HBD) mostly compounds such urea, polyols, sugars. Their melting points related to bonding, polarities higher than most ionic liquids, viscosities generally range 0.01–5 Pa·s. Compared with traditional organic conventional have solubility, ability dissolve oxides insoluble drugs, good biodegradability. high extraction rates flavonoids phenols, can increase solubility effectively extract perform pre-concentration metals synthesise new nanomaterial, be used electrolytes for electrochemical reactions electrochemistry. This paper collates relevant on physicochemical properties multi-field DESs, which provides a deeper understanding looks forward future development