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In this work, the adsorption and desorption capacities of six resins (HP-20, AB-8, X-5, DM130, HPD100, D4006) for the purification of hawthorn flavonoids were investigated. HP-20 resin was screened out that has the best adsorption capacity, with an adsorption capacity of 24.2 mg/g. Langmuir and Freundlich isotherm model, pseudo first-order and pseudo second-order kinetics and intra particle diffusion model were used to fit the adsorption process. The results indicated that the adsorption process of hawthorn flavonoids by HP-20 was in accordance with the Langmuir isotherm model and pseudo second-order model, and the optimal adsorption temperature was 298 K. The adsorption process was spontaneously exothermic as indicated by thermodynamic parameters. After purification, hawthorn flavonoids showed high acetylcholinesterase inhibitory activities.

Adsorption and desorption characteristics of flavonoids extracted from hawthorn ( Crataegus pinnatifida ) on macroporous resin