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Microchimica Acta

, Volume 183, Issue 2, pp 749–755 | Cite as

Homogeneous immunoassay for the cancer marker alpha-fetoprotein using single wavelength excitation fluorescence cross-correlation spectroscopy and CdSe/ZnS quantum dots and fluorescent dyes as labels

  • Jinjie Wang
  • Heng Liu
  • Xiangyi HuangEmail author
  • Jicun RenEmail author
Original Paper

Abstract

The article describes sensitive and selective homogeneous immunoassays for the liver cancer biomarker alpha-fetoprotein (AFP) in human serum by using single wavelength excitation fluorescence cross-correlation spectroscopy (SW-FCCS). Both competitive and sandwich immunoassay modes were applied, and AFP served as a model analyte. Fluorescent CdSe/ZnS quantum dots (with a 655 nm emission peak) and the fluorophore Alexa Fluor 488 (520 nm emission) were chosen to label the antibodies in the sandwich mode, and the antibody and the antigen in the competitive mode. Under optimized conditions, the sandwich assay has a linear dynamic range that covers the 20 pM to 5.0 nM concentration range. The competitive assay, in turn, extends from 180 pM to 15.0 nM. The respective detection limits are 20 pM and 180 pM. The method was successfully applied to directly determine AFP in (spiked) clinical samples, and results were in good agreement with data obtained via ELISAs.

Graphical Abstract

Homogeneous immunoassay based on single wavelength excitation fluorescence cross-correlation spectroscopy (SW-FCCS) has been used to detect the biomarker alpha-fetoprotein in human sera.

Keywords

Bioconjugate Cross-correlation function ELISA Size exclusion chromatography Tumor marker 

Notes

Acknowledgments

This work was financially supported by NSFC (Grants 21075081, 20905048, 21135004 and 21327004).

Supplementary material

604_2015_1694_MOESM1_ESM.doc (3.4 mb)
ESM 1 (DOC 3.35 mb)

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Copyright information

© Springer-Verlag Wien 2015

Authors and Affiliations

  1. 1.College of Chemistry & Chemical Engineering, State Key Laboratory of Metal Matrix CompositesShanghai Jiaotong UniversityShanghaiPeople’s Republic of China

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