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

Author(s): Qisui Wang, Fangyun Ye, Peng Liu, Xinmin Min, Xi Li.

Journal Name:Protein & Peptide Letters

Volume 18 , Issue 4 , 2011

Abstract:

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.

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

Rights & PermissionsPrintExport

Article Details

VOLUME: 18
ISSUE: 4
Year: 2011
Page: [410 - 414]
Pages: 5
DOI: 10.2174/092986611794653905
Price: $58