Separation and purification of resveratrol from Polygonum cuspidatum by macroporous adsorption resin mixed-bed techology.

This work is focused on separation and purification of resveratrol from Polygonum cuspidatum by macroporous adsorption resin (MAR) mixed-bed technology. Firstly, the optimal MAR mixed-bed was obtained according to the adsorption and desorption performance of 32 kinds of MAR. Then, operation conditions of adsorption and desorption were investigated and optimized, and optimal operation conditions were obtained. Under optimal conditions, the adsorption capacity and adsorption ratio arrived at 23.89 mg g−1 and 98.53% separately, while the desorption ratio and purity would be 82.05% and 19.32%. The purity was increased by 5 times in the crude extraction after an adsorption/desorption circle. Finally, the adsorption kinetics and thermodynamics were discussed. [ABSTRACT FROM AUTHOR]