Citation: LI Qiao-Feng, REN Shu-Yue, WANG Yu, BAI Jia-Lei, PENG Yuan, Ning Bao-An, LYU Quan-Jun, GAO Zhi-Xian. Efficient Detection of Environmental Estrogens Bisphenol A and Estradiol By Sensing System Based on AuNP-AuNP-UCNP Triple Structure[J]. Chinese Journal of Analytical Chemistry, ;2018, 46(4): 486-492. doi: 10.11895/j.issn.0253-3820.171171 shu

Efficient Detection of Environmental Estrogens Bisphenol A and Estradiol By Sensing System Based on AuNP-AuNP-UCNP Triple Structure

LI Qiao-Feng ^1,2, ,
REN Shu-Yue ² ,
WANG Yu ² ,
BAI Jia-Lei ² ,
PENG Yuan ² ,
Ning Bao-An ² ,
LYU Quan-Jun ¹ ,
GAO Zhi-Xian ^1,2

1.
Department of Nutrition and Food Hygiene, College of Public Health, Zhengzhou University, Zhengzhou 540001, China;
2.
Tianjin Key Laboratory of Risk Assessment and Control Technology for Environment and Food Safety, Tianjin Institute of Environmental & Operational Medicine, Tianjin 300050, China

Received Date: 16 August 2017
Revised Date: 30 January 2018

Fund Project: This work was supported by the National Natural Science Foundation of China (Nos.21477162,81773482) and the Science&Technology Planning Projects of Tianjin,China (No.14ZCZDSF0021).

A sensing system based on AuNP-AuNP-UCNP triple structure for efficient detection of dual targets was constructed. In the preparation of triple structure, the gold nanoparticles (AuNPs) and upconversion nanoparticles (NaYF₄:Yb, Er, Gd, UCNPs) were synthesized and surface modified. Then the two nanoparticles and their aptamers were connected to form two kinds of optical fluorescent probes. A nucleic acid sequence that matches with two aptamers was designed, rendering the probes to get close based on the principle of complementary base pairing. On the basis of this, a sensing system with a triple structure was prepared, and its connecting effect was characterized by TEM. With this system, dual targets of bisphenol A and estradiol were efficiently and conveniently detected through quantitative determination by fluorescence and UV spectrophotometer. At reaction temperature of 30℃ and pH=7.8, this method exhibited good linear range for determination of bisphenol A and estradiol from 2 ng/mL to 200 ng/mL and from 10 ng/mL to 150 ng/mL, with limits of detection of 0.2 ng/mL and 0.5 ng/mL, respectively. This sensing system with the triple structure owned better specificity to structural and functional analogues, and showed good repeatability and stability. What's more, this sensing system was applied in actual water detection, with the recoveries between 86.1% and 107.4%, and the relative standard deviation below 6.8%. This method showed promising applications in other environmental estrogens in water samples.
- Gold nanoparticles,
- Upconversion nanoparticle,
- Triple structure,
- Bisphenol A,
- Estradiol
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