The Preparation and Application of CdTe/CdS Core-shell Quantum Dots
Biocompatible and high luminescence CdTe/CdS core -shell quantum dots ( QDs ) were synthesized in aqueous solution using glutathione ( GSH) as sulfur source and stabilizer.Further, luteolin was studied for the affinities for human serum albumin ( HSA) in the presence and absence of CdTe/CdS QDs, respectively.Results revealed that the fluorescence intensities of HSA decreased remarkably with increasing concentration of QDs.Luteolin resulted in obvious red-shift of the maximum emission of HSA from 341 nm to 347 nm in the presence of QDs and the extent of red -shift induced by luteolin was much bigger than that in the absence of QDs.The binding constants and the number of binding sites per HSA molecule ( n) both increased.Thus, the binding affinities of luteolin for HSA increased in the presence of CdTe/CdS QDs.
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