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目的制备一种对罗丹明B具有特异性和强吸附性能的分子印迹材料。方法采用沉淀聚合法合成罗丹明B分子印迹聚合物(molecularly imprinted polymer,MIP),对分子印迹材料的动力学吸附、等温饱和吸附、选择性吸附及其对果汁样品中罗丹明B的吸附能力进行评价。结果以丙烯酰胺为功能单体制备的印迹聚合物的印迹效率(a=QMIP/QNIP)可达3。动力学吸附实验表明,MIP对罗丹明B的吸附可在15min内完成。等温吸附性能评价得出饱和吸附量约为170μg/mg。罗丹明B分子印迹聚合物对几种红色色素的吸附量的顺序为:罗丹明B>诱惑红>赤藓红>苋菜红>胭脂红。罗丹明B分子印迹聚合物对于添加到果汁中的罗丹明B可以很好地吸附而对其他成分的吸附较小。结论罗丹明B分子印迹聚合物对罗丹明B具有明显的特异性吸附性能,而且具有较强的吸附能力,是一种具有潜力的用于罗丹明B分析的固相萃取材料。
OBJECTIVE To prepare a molecularly imprinted material with specificity and strong adsorption capacity for rhodamine B. Methods The molecularly imprinted polymer (MIP) was synthesized by precipitation polymerization. The kinetics, adsorption isotherms and adsorption of molecularly imprinted polymer on rhodamine B in fruit juice samples were studied. Evaluation. Results The imprinting efficiency (a = QMIP / QNIP) of imprinted polymers prepared with acrylamide as functional monomer was 3. Kinetic adsorption experiments showed that adsorption of rhodamine B by MIP can be completed in 15 min. Isothermal adsorption performance evaluation of saturated adsorption was about 170μg / mg. Rhodamine B molecularly imprinted polymer on the adsorption of several red pigment in the order: Rhodamine B> Seduction Red> Erythrosin> Amaranth> Carmine. Rhodamine B molecularly imprinted polymer adsorbs rhodamine B added to fruit juices well and adsorbs other components less. Conclusion Rhodamine B molecularly imprinted polymer has obvious specific adsorption properties to rhodamine B and has strong adsorption capacity. It is a potential solid phase extraction material for rhodamine B analysis.