大孔树脂对枸杞皮渣类胡萝卜素吸附性能的比较

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

用HP20、S-8、AB-8、D101和X-55种大孔树脂对枸杞皮渣提取液中的类胡萝卜素的吸附特性进行研究，发现X-5树脂对类胡萝卜紊组分在pH4，温度为45℃，时间为120min的条件下吸附率最大为421μg／g，选用乙酸乙酯做解吸剂，解吸率最大可达81．7％。上样液流速在1．5～4．5mL/min之间，树脂吸附可达8倍柱床体积（160mL），在此条件下需要洗脱剂用量为7．5倍柱床体积（150mL）的洗脱液可将类胡萝卜紊洗脱下来。采用Langmuir和Freundlich方程拟合25～45℃枸杞皮渣中类胡萝卜素的吸附等温线，结果表明：x-5树脂对类胡萝卜素的静态吸附符合Freundlich等温式。

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 120min,pH4,45℃ had the highest adsorption rate of 42μg/g, the desorption rate of ethyl acetate used as desorption solvent was 81.7 %.When sample flow rate was fixed as 1.5-4.5mL/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.