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学科主题: 物理化学
题名: Highly sensitive synchronous fluorescence determination of mercury (II) based on the denatured ovalbumin coated CdTe QDs
作者: Wang, Yan-Qin1, 2;  Liu, Yang1, 2;  He, Xi-Wen1, 2;  Li, Wen-You1, 2;  Zhang, Yu-Kui1, 2, 3
通讯作者: 李文友
关键词: Denatured ovalbumin coated CdTe QDs ;  Synchronous fluorescence ;  Mercury (II) determination ;  Probe
刊名: TALANTA
发表日期: 2012-09-15
DOI: 10.1016/j.talanta.2012.04.064
卷: 99, 页:69-74
收录类别: SCI
文章类型: Article
部门归属: 18
项目归属: 1810
产权排名: 2,5
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Analytical
研究领域[WOS]: Chemistry
英文摘要: Chemically denatured ovalbumin (dOB) was used to modify the surface of 3-mercaptopropionic acid (MPA) stabilized CdTe quantum dots (QDs), which resulted in a great enhancement of the synchronous fluorescence intensity. Moreover, dOB shell layer can effectively prevent the binding of other cations onto the QDs core and enhance the selective binding ability of Hg2+ to dOB coated CdTe QDs (CdTe-dOB QDs). A simple method with high sensitivity and selectivity was developed for the determination of Hg2+ with the CdTe-dOB QDs as fluorescence probe based on the merits of synchronous fluorescence spectroscopy (SFS). When scanning with excitation and emission wavelengths of 250 nm and 470 nm (Delta lambda=lambda(em)-lambda(ex)=220 nm), respectively, the maximum synchronous fluorescence peak of the CdTe-dOB QDs was located at 328 nm. Under optimal conditions, the change of the synchronous fluorescence intensity was in good linear relationship with the Hg2+ concentration in the range of 0.08 x 10(-7) to 30.0 x 10(-7) mol L-1 and the detection limit was 4.2 x 10(-9) mol L-1 (S/N=3). The relative standard deviation of seven replicate measurements for the concentration of 2.0 x 10(-7) mol L-1 and 20.0 x 10(-7) mol L-1 were 2.8% and 2.3%, respectively. Compared with general fluorescence methods, the proposed method, which combined the advantages of high sensitivity of synchronous fluorescence and specific response of Hg2+ to CdTe-dOB, had a wider linear range and higher sensitivity. Furthermore, the proposed method was applied to the determination of trace Hg2+ in water samples with satisfactory results. (C) 2012 Elsevier B.V. All rights reserved.
关键词[WOS]: ZNS QUANTUM DOTS ;  ULTRASENSITIVE DETERMINATION ;  GOLD NANOCLUSTERS ;  NANOCRYSTALS ;  PROTEIN ;  NANOPARTICLES ;  PROBE ;  ION ;  SPECTROSCOPY ;  TEMPERATURE
语种: 英语
WOS记录号: WOS:000309785300010
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/118227
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Nankai Univ, State Key Lab Med Chem Biol, Tianjin 300071, Peoples R China
2.Nankai Univ, Dept Chem, Tianjin 300071, Peoples R China
3.Chinese Acad Sci, Dalian Inst Chem Phys, Natl Chromatog Res & Anal Ctr, Dalian 116011, Peoples R China

Recommended Citation:
Wang, Yan-Qin,Liu, Yang,He, Xi-Wen,et al. Highly sensitive synchronous fluorescence determination of mercury (II) based on the denatured ovalbumin coated CdTe QDs[J]. TALANTA,2012,99:69-74.
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