Equilibrium and Kinetic Studies on the Adsorption of Lignans from Schisandra chinensis by Commercial Macroporous Resins

Seventeen resins were evaluated by their adsorption capacities from two solvent systems, ethanol aqueous solution and surfactant emulsifiable solution, prepared from Schisandra chinensis. The adsorption of lignans from surfactant emulsifiable solution on LS-305, XAD-16, HPD-100, and XAD-4 as a function of contact time, initial adsorbate concentration, and temperature was investigated by using batch experiments. LS-305 and XAD-16 exhibited higher lignans adsorption capacity than HPD-100 and XAD-4. The adsorption kinetics and Freundlich isotherm model of lignans on the four resins were well described by a pseudo-second-order and Freundlich isotherm models, respectively. The adsorption of lignans on the resins was spontaneous.