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题名: Probing the mechanism of the interaction between L-cysteine-capped-CdTe quantum dots and Hg2+ using capillary electrophoresis with ensemble techniques
作者: Xu, LF; Hao, JJ; Yi, T; Xu, YY; Niu, XY; Ren, CL; Chen, HL; Chen, XG(陈兴国)
收录类别: SCIE ; MEDLINE ; BIOSIS
出版日期: 2015-03
刊名: ELECTROPHORESIS
卷号: 36, 期号:6, 页码:859-866
英文摘要: A good understanding of the mechanism of interaction between quantum dots (QDs) and heavy metal ions is essential for the design of more effective sensor systems. In this work, CE was introduced to explore how L-cysteine-capped-CdTe QDs (L-cys-CdTe QDs) interacts with Hg2+. The change in electrophoretic mobility can synchronously reflect the change in the composition and property of QDs. The effects of the free and capping ligands on the system are discussed in detail. ESI-MS, dynamic light scattering (DLS), zeta potential, and fluorescence (FL) were also applied as cooperative tools to study the interaction mechanism. Furthermore, the interaction mechanism, which principally depended on the concentration of Hg2+, was proposed reasonably. At the low concentration of Hg2+, the formation of a static complex between Hg2+ and the carboxyl and amino groups of L-cys-CdTeQDs surface was responsible for the FL quenching. With the increase of Hg2+ concentration, the capping L-cys was stripped from the surface of L-cys-CdTe QDs due to the high affinity of Hg2+ to the thiol group of L-cys. Our study demonstrates that CE can reveal the mechanism of the interaction between QDs and heavy metal ions, such as FL quenching.
关键词: Capillary electrophoresis ; CdTe quantum dots ; Hg2+ ; Interaction mechanism
作者部门: [Xu, Laifang ; Hao, Junjie ; Xu, Yinyin ; Niu, Xiaoying ; Ren, Cuiling ; Chen, Hongli ; Chen, Xingguo] Lanzhou Univ, State Key Lab Appl Organ Chem, Lanzhou 730000, Peoples R China ; [Xu, Laifang ; Hao, Junjie ; Xu, Yinyin ; Niu, Xiaoying ; Ren, Cuiling ; Chen, Hongli ; Chen, Xingguo] Lanzhou Univ, Dept Chem, Lanzhou 730000, Peoples R China ; [Chen, Xingguo] Key Lab Nonferrous Met Chem & Resources Utilizat, Lanzhou, Peoples R China ; [Yi, Tao] Hong Kong Baptist Univ, Sch Chinese Med, Hong Kong, Hong Kong, Peoples R China
通讯作者: Chen, HL (reprint author), Lanzhou Univ, State Key Lab Appl Organ Chem, Lanzhou 730000, Peoples R China.
学科分类: Biochemistry & Molecular Biology; Chemistry
文章类型: Article
所属项目编号: National Natural Science Foundation of China [21005035, 21475053]
所属项目名称: 国家自然科学基金项目
项目资助者: NSFC
语种: 英语
DOI: 10.1002/elps.201400509
ISSN号: 0173-0835
WOS记录号: WOS:000351549900002
PM记录号: 25545181
BIOSIS记录号: BCI:BCI201500342446
IR记录号: WOS:000351549900002
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内容类型: 期刊论文
URI标识: http://ir.lzu.edu.cn/handle/262010/180013
Appears in Collections:化学化工学院_期刊论文

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Recommended Citation:
Xu, LF,Hao, JJ,Yi, T,et al. Probing the mechanism of the interaction between L-cysteine-capped-CdTe quantum dots and Hg2+ using capillary electrophoresis with ensemble techniques[J]. ELECTROPHORESIS,2015,36(6):859-866.
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