Ultrasound and deep eutectic supramolecular polymers (DESP) is a novel combination of green extraction method for phytochemicals. In this study, a new type of green extractant was developed: DESP. It is a derivative of deep eutectic solvent (DES) and was prepared by supramolecular polymer unit β-cyclodextrin (β-CD) as hydrogen bond acceptor (HBA) and organic acid as hydrogen bond donor (HBD). The current work focuses on the use of ultrasonic-assisted (UAE) DESP extraction of polyphenolic compounds (PCs) from bayberry. The experimental results showed that DESP synthesized with β-CD and lactic acid (LA) in a ratio of 1:1 (w/w %) had the best extraction effect. And by using a three-level factor experiment and the response surface method, the predicted TPC content is very close to the actual content (28.85 ± 1.27 mg GAE/g). The DESP extract including PCs were further used as plasticizer for chitosan (CS) to prepare highly active green biofilms (DESP-CS). It is possible to reduce the tedious procedures for separating biologically active substances from DESP. The experiment proved that the prepared films have good mechanical properties, plastic deformation resistance, thermal stability and antioxidant activity.

超声波与深共晶超分子聚合物（DESP）是一种新颖的组合绿色植物化学物质提取方法。本研究开发了一种新型绿色萃取剂：DESP。它是低共熔溶剂（DES）的衍生物，由超分子聚合物单元β-环糊精（β-CD）作为氢键受体（HBA）和有机酸作为氢键供体（HBD）制备而成。目前的工作重点是使用超声波辅助 (UAE) DESP 从杨梅中提取多酚化合物 (PC)。实验结果表明，β-CD与乳酸(LA)按1:1(w/​​w%)合成的DESP提取效果最好。并且通过三水平因子实验和响应面法，预测的TPC含量与实际含量（28.85±1.27 mg GAE/g）非常接近。含有PC的DESP提取物进一步用作壳聚糖（CS）的增塑剂，以制备高活性的绿色生物膜（DESP-CS）。可以减少从 DESP 中分离生物活性物质的繁琐程序。实验证明所制备的薄膜具有良好的力学性能、抗塑性变形能力、热稳定性和抗氧化活性。