Isolation and purification of oleuropein from olive leaves using boric acid affinity resin and a novel solvent system

Abstract

Oleuropein is an important natural compound with many biological activities. How to get high purity oleuropein is an urgent issue to be solved. This study provided a method for separating and purifying high purity oleuropein from olive leaves using boric acid affinity resin and a novel solvent system. And the experimental kinetic and adsorption isotherm data of boric acid affinity resin were well–fitted pseudo–first–order kinetic model and Langmuir isotherm model, respectively. The dynamic desorption experiments showed that ethanol was the most efficient eluent while had the lowest oleuropein purity. However, after the novel solvent system treated only one cycle of adsorption and desorption, the purity of oleuropein increased by 5.55 folds from 12.31 ± 0.42% – 68.30 ± 2.08 %. The results can guide the separation and purification of high purity catechol natural products using boric acid affinity resin and mixed solvent systems.