**4. Conclusions**

The effects of different drying techniques on the physical and chemical properties, functional structure, and antioxidant activity of JPSs were studied and compared. The results showed that different drying techniques not only affected the drying time of jujube and jujube polysaccharides but also significantly affected the physicochemical properties and antioxidant activity of jujube polysaccharides. The extraction time, molecular weight, monosaccharide composition, apparent viscosity, uronic acid content, and polyphenol content of the JPSs obtained from the different drying techniques were different. Compared with HAD, the polysaccharides obtained by RFD improved the drying efficiency and showed strong antioxidant activity. The current results can provide a theoretical basis for extracting and drying polysaccharides from jujube using this two-step drying method in industrial application.

**Author Contributions:** Conceptualization, B.W. and Y.G.; methodology, C.Q.; software, K.G.; formal analysis, Y.M.; data curation, C.Z.; writing—original draft preparation, C.Q. and B.W.; writing— review and editing, Y.G.; visualization, D.L.; supervision, Y.G.; project administration, H.M. All authors have read and agreed to the published version of the manuscript.

**Funding:** China Postdoctoral Science Foundation (Nos. 2021M700908 and 2022TQ0128) and the Key Laboratory of Storage of Agricultural Products, Ministry of Agriculture and Rural Affairs (No. kf2022002).

**Institutional Review Board Statement:** Not applicable.

**Informed Consent Statement:** Not applicable.

**Data Availability Statement:** Not applicable.

**Conflicts of Interest:** The authors declare that they have no conflict of interest.
