CdTe nanocrystals as luminescent probes for detecting ATP, folic acid and L-cysteine in aqueous solution

被引：71
|
作者：
Wang, Yong [1 ,2 ,3 ]
Zheng, Jianwei [1 ,2 ,3 ]
Zhang, Zhijuan [1 ]
Yuan, Chunwei [1 ]
Fu, Degang [1 ,2 ,3 ]
机构：
[1] Southeast Univ, State Key Lab Bioelect, Nanjing 210096, Peoples R China
[2] Jiangsu Lab Biomat & Devices, Nanjing 210096, Peoples R China
[3] Southeast Univ, Res Inst, Key Lab Environm & Biosafety Suzhou, Suzhou 215123, Peoples R China
来源：
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS | 2009年 / 342卷 / 1-3期
关键词：
CdTe; Quantum dots; Photoluminescence; Probes; CDSE QUANTUM DOTS; ORGANOPHOSPHORUS HYDROLASE; CYANIDE; NANOPARTICLES;
D O I：
10.1016/j.colsurfa.2009.04.020
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
CdTe quantum dots capped by short-chain thioglycolic acid (TGA) are prepared in aqueous Solution. In this Study, we report the effect of adenosine 5' triphosphate (ATP), folic acid and L-cysteine on the photoluminescence intensity of CdTe nanocrystals in pH 7.4 Tris-HCl buffer solutions. The luminescence of CdTe nanocrystals is quenched in the presence of ATP or folic acid which is related to their concentrations. The relationship between the luminescence intensity of CdTe nanocrystals and the concentration of ATP or folic acid is described by the Stern-Volmer equation. The emission intensity of CdTe nanocrystals is enhanced in the presence of L-cysteine. The relationship between the emission intensity of CdTe nanocrystals and the concentration of L-Cysteine agrees with Langmuir binding isotherm equation in the range of 5 x 10(-6) to 2 x 10(-4) mol/L. These results show that CdTe nanocrystals can be potentially used as luminescence probes for detecting ATP, folic acid and L-cysteine. (c) 2009 Elsevier B.V. All rights reserved.
引用
收藏
页码：102 / 106
页数：5
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