Comparison of the sorption characteristics of macroporous resin to carotenoids of Chinese wolfberry skins

To purify carotenoids from Chinese wolfberry skins by resins, the static adsorption and desorption performances were investigated among HP20, S-8, AB-8, D101 and X-5 resins.The experimental results showed that X-5 resin under the condition of adsorption time 120 min, pH4, 45℃ had the highest adsorption rate of 421μg /g, the desorption rate of ethyl acetate used as desorption solvent was 81.7 %.When sample flow rate was fixed as1.5~4.5mL /min, macroporous resin could reach 8 times bed volumes ( 160mL) .Under similar conditions the dosage of eluent as 7.5 times bed volumes ( 150mL) .Freundlich and Langmuir equations were used to model the adsorption isotherms at equilibrium in the range of 25~45℃, the result showed that the Freundlich model fit the experimental date adequately.