Synthesis of streptavidin-FITC-conjugated core-shell Fe3O4-Au nanocrystals and their application for the purification of CD4+ lymphocytes

Hong Ling Liu, Chung Hee Sonn, Jun Hua Wu, Kyung Mi Lee, Young Keun Kim

Research output: Contribution to journalArticlepeer-review

101 Citations (Scopus)


We explored the feasibility of magnetite (Fe3O4)-gold (Au) core-shell nanocrystals as a useful vehicle for biomedical application such as cell separation. Streptavidin-fluorescein isothiocyanate (STA-FITC) was conjugated to the surface of the Fe3O4-Au core-shell nanocrystals using a carbodimide activation protocol. These nanocrystals were further tested for their ability to bind CD4+ T lymphocytes, bound to biotin-labeled anti-CD4 mAbs, isolated from the spleen of C57BL/6 mice. Our data show that the Fe3O4-Au nanocrystals successfully pulled down CD4+ T lymphocytes from the whole splenocytes with high specificity. Therefore, our nanocrystals provide an efficient tool for the cell separation process and further present the dramatic potential to be applied to other areas of biomedical application including diagnosis, monitoring, and treatment of human diseases.

Original languageEnglish
Pages (from-to)4003-4011
Number of pages9
Issue number29
Publication statusPublished - 2008 Oct


  • Core-shell nanocrystals
  • Fe3O4-Au
  • Fluorescence-activated cell sorting
  • Magnetic activated cell separation
  • Streptavidin

ASJC Scopus subject areas

  • Bioengineering
  • Ceramics and Composites
  • Biophysics
  • Biomaterials
  • Mechanics of Materials


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