High-sensitivity quantum dot-based fluorescence resonance energy transfer bioanalysis by capillary electrophoresis

文献类型： 外文期刊

第一作者： Li, Yong-Qiang

作者： Li, Yong-Qiang;Wang, Jian-Hao;Zhang, Hai-Li;Yang, Jie;Guan, Li-Yun;Luo, Qing-Ming;Zhao, Yuan-Di;Chen, Hong

作者机构：

关键词： Quantum dots;Fluorescence resonance energy transfer;Immunoreaction

期刊名称：BIOSENSORS & BIOELECTRONICS （ 影响因子：10.618； 五年影响因子：9.323 ）

ISSN：

年卷期：

页码：

收录情况： SCI

摘要： Here a new method for high-sensitivity quantum dot (QD)-based fluorescence resonance energy transfer (FRET) bioanalysis was developed. In this method, capillary electrophoresis (CE) with fluorescence detection was applied. The FRET system consisted of water-soluble 532-nm emitting CdTe QDs donor and 632-nm emitting CdSe/ZnS QDs acceptor which were covalently conjugated with mouse IgG and goat anti-mouse IgG, respectively. The bio-affinity between antigen and antibody brought two kinds of QDs close enough to make the FRET happen between them. In the CE experiments, highly efficient separation of donor-acceptor immunocomplexes was obtained, and the process of FRET was monitored. Results showed that FRET efficiency obtained by CE (38.56-69.58%) improved substantially in comparison with that obtained by ensemble measurement (12.77-52.37%). The high efficient separation of donor-acceptor immunocomplexes and the possible conformation change of antigen and antibody, contributes to the lower analysis uncertainty (variance) and higher FRET efficiency obtained in CE and consequentially, this makes the analysis of FRET more sensitive. This novel CE-based technique can be easily extended to other FRET system based on QDs and may have potential application in the study of biomolecule conformation change.

分类号： Q

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