分子烙印聚合物作超临界流体萃取后处理用固体吸附剂  

A Study of Molecular Imprinted Polymer as the Adsorbent in the Clean-up Step after Supercritical Fluid Extraction

作　　者：游静[1] 劳文剑[1] 黄悯嘉[1] 王国俊[1] 

机构地区：[1]中国科学院兰州化学物理研究所,兰州730000

出　　处：《分析化学》2002年第5期518-521,共4页Chinese Journal of Analytical Chemistry

摘　　要：利用离线超临界流体萃取与高效毛细管电泳相结合 ,分析了标准添加样品中的除草剂 (2 ,4 二氯苯氧乙酸 (2 ,4 D) ) ,探讨了温度、压力和改性剂对萃取的影响 ;考察了在不同条件下合成的以 2 ,4 D为烙印分子的分子烙印聚合物对 2 ,4 D在不同极性溶剂中的吸附能力 ,并将分子烙印聚合物作为超临界流体萃取后处理用固体吸附剂。结果表明 :在甲醇和水的混合极性溶剂中制备的分子烙印聚合物对提高分析选择性的效果最佳。2,4-Dichlorbenzoic acid (2,4-D) in the spiked sample was analyzed by supercritical fluid extraction (SFE) along with high performance capillary electrophoresis (HPCE). The influence of temperature, pressure and modifier on SFE was investigated. 2,4-D can be quantitatively extracted ( > 70 %) in the SFE condition of CaCl2 methanol as modifier, 20 MPa, 60degreesC. The adsorptivities in solvents with different polar of molecular imprinted polymers (MIP) which were made in different conditions to 2,4-D were also studied. It is the first report that MIP is used as the adsorbent in the clean-up step after SFE. The results showed that MIP made in the mixed solvent of methanol and water could give the best result to improve the analytical selectivity.

关 键 词：分子烙印聚合物 超临界流体萃取 后处理 固体吸附剂 2 4-氯苯氧乙酸 改性剂 样品前处理 除草剂 分析 

分 类 号：O658[理学—分析化学]