In this work, we studied fluorescence (or Förster) resonance energy transfer between thiol- and cysteamine-capped green-emitting quantum dots (QDs) CdSe/ZnS (donor) and erythrosin B (acceptor) upon binding to bovine serum albumin in aqueous solution. Both steady-state and time-resolved fluorescent measurements revealed more effective resonance energy transfer from QDs with positively charged capping ligand. The results are discussed in terms of mechanisms of QDs bindings to the protein.

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