Acta Chimica Sinica ›› 2009, Vol. 67 ›› Issue (18): 2121-2126. Previous Articles     Next Articles

Original Articles


张朝晖*,a,b 胡宇芳a 张华斌a 李 辉a,b 姚守拙b   

  1. (a吉首大学化学化工学院 吉首 416000)
    (b湖南大学化学传感与计量国家重点实验室 长沙 410082)
  • 收稿日期:2008-10-25 修回日期:2009-02-15 出版日期:2009-09-28 发布日期:2009-12-31
  • 通讯作者: 张朝晖

Preparation and Evaluation of Caffeine Molecularly Imprinted Composite Membrane

Zhang, Zhaohui*,a,b Hu, Yufanga Zhang, Huabina Li, Hui a,b Yao, Shouzhuob   

  1. (a College of Chemistry and Chemical Engineering, Jishou University, Jishou 416000)
    (b State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha 410082)
  • Received:2008-10-25 Revised:2009-02-15 Online:2009-09-28 Published:2009-12-31
  • Contact: ZHANG Zhao-Hui

Employing nylon membrane as the supported membrane, caffeine as template, acrylamide (AA) as functional monomer and ethyleneglycol dimethyacrylate (EGDMA) as cross linker, molecularly imprinted composite membrane was prepared by using a surface thermal-polymerization method. The characterization of the caffeine molecularly imprinted membrane was performed with infrared spectroscopy, X-ray diffraction, thermogravimetric analysis and liquid chromatography techniques in detail. The results show that the imprinted membrane exhibits excellent selectivity for the template with the selectivity factor 2.30 and can be better applied to separate and enrich tea extract with an enrichment factor 10.52. The imprinted membrane exhibited better combination capabilities to the template molecule with two imprinted binding sites. The maximum apparent amounts for higher binding site and lower binding site are 0.146 and 0.330 μmol/g, respectively.

Key words: caffeine, imprinted membrane, preparation, evaluation