Analytical and Bioanalytical Chemistry

, Volume 404, Issue 5, pp 1555–1564 | Cite as

Preparation of a magnetic molecularly imprinted polymer with pseudo template for rapid simultaneous determination of cyromazine and melamine in bio-matrix samples

  • Xianhua Wang
  • Qiuxue Fang
  • Shipeng Liu
  • Lei ChenEmail author
Original Paper


A magnetic molecularly imprinted polymer (M-MIP) for cyromazine and melamine was prepared by simple suspension polymerization using a pseudo template, 2-(4,6-diamino-1,3,5-triazin-2-ylamino)ethanethiol disulfide. The M-MIP was characterized by scanning electron microscopy, Fourier-transform infrared spectroscopy, and vibrating sample magnetometry. Molecular recognition properties and binding capability to cyromazine and melamine were evaluated by adsorption testing, which showed the M-MIP had better affinity and selectivity than the magnetic non-imprinted polymer (M-NIP) for cyromazine and melamine. A method based on molecularly imprinted solid-phase extraction assisted by magnetic separation was developed for extraction of cyromazine and melamine from bio-matrix samples. Various conditions, for example desorption conditions, amount of M-MIP, extraction time, and sample pH were optimized. High-performance liquid chromatography with UV detection was used to determine cyromazine and melamine after extraction. The proposed method was successfully applied to determination of cyromazine and melamine in egg and milk samples. Recovery of standard spiked cyromazine and melamine from these samples was between 71.86 and 80.57 %, with intraday and interday relative standard deviation ranging from 3.45 to 6.39 % and from 3.95 to 7.84 %, respectively. The results indicate that the pseudo template M-MIP can be used for preconcentration, purification, and analysis of cyromazine and melamine in bio-matrix samples.


Magnetic molecularly imprinted polymer Solid phase extraction Magnetic separation Cyromazine Melamine 



This work was supported by the National Natural Science Foundation of China (Grant Nos. 20775053 and 20875067).


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Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  • Xianhua Wang
    • 1
  • Qiuxue Fang
    • 1
  • Shipeng Liu
    • 1
  • Lei Chen
    • 1
    Email author
  1. 1.School of Pharmaceutical Science and TechnologyTianjin UniversityTianjinChina

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