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Preparation of visible-light-excited europium biolabels for time-resolved luminescence cell imaging application

Authors
Journal
Talanta
0039-9140
Publisher
Elsevier
Publication Date
Volume
108
Identifiers
DOI: 10.1016/j.talanta.2013.02.065
Keywords
  • Visible-Light-Excited Europium Biolabel
  • Transferrin
  • Folic Acid
  • Time-Resolved Luminescence Bioassay
  • Cell Imaging

Abstract

Abstract By using a visible-light-excited ternary Eu3+ complex, BHHBCB-Eu3+-BPT (BHHBCB: 1,2-bis[4′-(1“,1“,1“,2“,2“,3“,3“-heptafluoro-4″,6″-hexanedion-6″-yl)-benzyl]-4-chlorosulfobenzene; BPT: 2-(N,N-diethylanilin-4-yl)-4,6-bis(pyrazol-1-yl)-1,3,5-triazine), as a luminophore, two kinds of novel visible-light-excited europium materials, the silica-encapsulated BHHBCB-Eu3+-BPT ([email protected]) nanoparticles and BHHBCB-Eu3+-BPT-conjugated bovine serum albumin (BSA–BHHBCB-Eu3+-BPT), were prepared for biolabeling and time-resolved luminescence cell imaging applications. The [email protected] nanoparticles, prepared by the copolymerization of 3-aminopropyl(triethoxy)silane–BHHBCB-Eu3+-BPT conjugate, free 3-aminopropyl(triethoxy) silane and tetraethyl orthosilicate in a water-in-oil reverse microemulsion, are monodispersed, spherical and uniform in size, and strongly luminescent with an excitation peak at ∼400nm and a long luminescence lifetime of 346μs. The BSA–BHHBCB-Eu3+-BPT, prepared by covalent binding of BHHBCB-Eu3+-BPT to BSA, shows also strong visible-light-excited luminescence with a excitation peak at ∼400nm and a long luminescence lifetime of 402μs. The two materials were used for labeling transferrin and folic acid. Using the time-resolved luminescence imaging of living HeLa cells, the cell-surface receptors of transferrin and folic acid were successfully visualized by the prepared biolabels based on the ligand–receptor affinity binding interaction. The results demonstrated the feasibility of the new materials as visible-light-excited biolabels for the time-resolved luminescence cell imaging.

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