Journal
CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
Volume 40, Issue 2, Pages 224-229Publisher
SCIENCE PRESS
DOI: 10.1016/S1872-2040(11)60530-6
Keywords
Quantum dots; Fluorescence resonance energy transfer; Fluorescence quenching; Prostate-specific antigen; CdSe; CdTe
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Funding
- National Natural Science Foundation of China [21165007]
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Fluorescence resonance energy transfer (FRET) from CdSe quantum dots to CdTe quantum dots was studied and used to determine the serum prostate-specific antigen (PSA). The effective energy transfer occurred between CdSe and CdTe in Tris-HCl buffer solution at pH 8.0, at which the CdTe fluorescence intensity increased greatly. When prostate-specific antigen (PSA) was added, the fluorescence intensity of CdSe-CdTe system decreased and the fluorescence was finally quenched because of the specific immunological reaction between the PSA antigen and the CdTe-labelled PSA antibody. There was a linear relationship between the concentrations of the PSA antigen and the fluorescence-quenching intensities. Then a new determination strategy of PSA was built by using the CdSe-CdTe system. Under optimum conditions, the linear range of PSA antigen was 2.8-10 mu g L-1, with a correlation coefficient of r = 0.9992 and a detected limit of 1.5 x 10(-2) mu g L-1 (n = 11).
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