A Study of Molecular Imprinted Polymer as the Adsorbent in the Clean-up Step after Supercritical Fluid Extraction
You Jing, Lao Wenjian, Huang Minjia, Wang Guojun (Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000)
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 CaCl 2 methanol as modifier, 20 MPa, 60℃. 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.
【CateGory Index】： O658