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Conjugation and Fluorescence Quenching Between Bovine Serum Albumin and L-Cysteine Capped CdSe/CdS Quantum Dots

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Water-soluble, biological-compatible, and excellent fluorescent CdSe/CdS quantum dots (QDs) with L-cysteine as capping agent were synthesized in aqueous medium. Fluorescence (FL) spectra, absorption spectra, and transmission electron microscopy (TEM) were employed to investigate the quality of the products. The interactions between QDs and bovine serum albumin (BSA) were studied by absorption and FL titration experiments. With addition of QDs, the FL intensity of BSA was significantly quenched which can be explained by static mechanism in nature. When BSA was added to the solution of QDs, FL intensity of QDs was faintly quenched. Fluorescent imaging suggests that QDs can be designed as a probe to label the Escherchia coli (E. coli) cells. These results indicate CdSe/CdS/L-cysteine QDs can be used as a probe for labeling biological molecule and bacteria cells.

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Keywords: Bovine Serum Albumin; CdSe/CdS; E. Coli; L-cysteine; Stern-Volmer; TEM image; Tris-HCl buffer solution; UV-visible absorption spectroscopy; biological labeling; biological-compatible; fluorescence; quantum dots; quencher (QDs); spectrophotometer; transmission electron microscopy (TEM)

Document Type: Research Article

Publication date: 2011-04-01

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  • Protein & Peptide Letters publishes short papers in all important aspects of protein and peptide research, including structural studies, recombinant expression, function, synthesis, enzymology, immunology, molecular modeling, drug design etc. Manuscripts must have a significant element of novelty, timeliness and urgency that merit rapid publication. Reports of crystallisation, and preliminary structure determinations of biologically important proteins are acceptable. Purely theoretical papers are also acceptable provided they provide new insight into the principles of protein/peptide structure and function.
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