Enrichment and isolation of syringin and oleuropein from Syringa reticulata subsp. amurensis branch bark ionic liquid extract via macroporous resin adsorption and desorption

Enrichment and isolation of syringin and oleuropein from S yringa reticulata subsp. amurensis branch bark ionic liquid extracts was investigated and compared using a variety of macroporous adsorption resins. After comparison, HPD100B resin is found to provide a higher adsorption capacity and desorption ratio for syringin and oleuropein than the other resins, and was, thus, selected as the optimal resin. Moreover, the recycling of ionic liquid and regeneration and reuse of HPD100B resin was studied, which showed the achievement of better results. Langmuir and Freundlich models were used to simulate the adsorption isotherm data for syringin and oleuropein at different temperatures to investigate the affinity of HPD100B resin for the corresponding solutes. Dynamic adsorption and desorption exams were conducted using a column packed with HPD100B resin, and the technical parameters were investigated and optimized. The purity of syringin in the product is determined to be 1.2%, and the purity of oleuropein is 10%, with recoveries of 73.58% and 75.00%, respectively. The proposed technique is shown to be a promising method for the preparation of syringin and oleuropein from S. reticulata subsp. amurensis branch bark or other herbal materials. • Syringin and oleuropein adsorption/desorption performance of 11 resins were compared. • S yringa reticulata subsp. amurensis branch bark ionic liquid extracts were considered. • The static and dynamic tests on a non-ionic polymeric resin was investigated. • Macroporous resin was attempted for separation target analytes from C4mimBr solution. • Resin HPD100B was the most suitable one from the testing of 11 types of resins.