Journal of Fluorescence

, Volume 25, Issue 2, pp 361–367 | Cite as

A Magnetic Nanoparticle-Based Time-Resolved Fluoroimmunoassay for Determination of the Cytokeratin 19 Fragment in Human Serum

  • Guanfeng Lin
  • Tiancai Liu
  • Jingyuan Hou
  • Zhiqi Ren
  • Jianwei Zhou
  • Qianni Liang
  • Zhenhua Chen
  • Wenqi DongEmail author
  • Yingsong WuEmail author


A sensitive, rapid and novel measurement method for cytokeratin 19 fragment (CYFRA 21–1) in human serum by magnetic particle-based time-resolved fluoroimmunoassay (TRFIA) is described. Built on a sandwich-type immunoassay format, analytes in samples were captured by one monoclonal antibody coating onto the surface of magnetic beads and “sandwiched” by another monoclonal antibody labeled with europium chelates. The coefficient variations of the method were lower than 7 %, and the recoveries were in the range of 90–110 % for serum samples. The lower limit of quantitation of the present method for CYFRA 21–1 was 0.78 ng/ml. The correlation coefficient of CYFRA 21–1 values obtained by our novel TRFIA and CLIA was 0.980. The present novel TRFIA demonstrated high sensitivity, wider effective detection range and excellent reproducibility for determination of CYFRA 21–1 can be useful for early screening and prognosis evaluation of patients with non-small cell lung cancer.


Magnetic nanoparticles Time-resolved fluoroimmunoassay Cytokeratin 19 fragment 



Non-small cell lung cancer

CYFRA 21–1

Cytokeratin 19 fragment


Time-resolved fluoroimmunoassay


Ovine serum albumin


4-morpholineethanesulfonic acid




1-ethyl-3-(3-dimethylaminopropyl) carbodiimide hydrochloride




Chemiluminescence immunoassay


Monoclonal antibody


Lower limit of quantitation


Relative error


Coefficient of variation


Standard deviation



The work was supported by the National Natural Science Foundation of China (Grant No. 81271931) and the Natural Science Foundation of Guangdong Province (Grant No. S2012010009547).


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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  • Guanfeng Lin
    • 1
  • Tiancai Liu
    • 1
  • Jingyuan Hou
    • 1
  • Zhiqi Ren
    • 1
  • Jianwei Zhou
    • 1
  • Qianni Liang
    • 1
  • Zhenhua Chen
    • 1
  • Wenqi Dong
    • 2
    Email author
  • Yingsong Wu
    • 1
    Email author
  1. 1.Institute of Antibody Engineering, School of BiotechnologySouthern Medical UniversityGuangzhouChina
  2. 2.Department of Biopharmaceutical, School of BiotechnologySouthern Medical UniversityGuangzhouChina

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