A urea electrochemical sensor based on molecularly imprinted chitosan film doping with CdS quantum dots
- 作者：Hui-Ting Lian ; Bin Liu ; bliu@hqu.edu.cn ; Yan-Ping Chen ; Xiang-Ying Sun
- 关键词：CdS quantum dots (QDs) ; Molecularly imprinted technique ; Electrochemical sensor ; Urea
- 刊名：Analytical Biochemistry
- 出版年：2012
- 期刊代码：93_00032697
- 类别：imm
- 出版时间：1 July, 2012
- 卷：426
- 期：1
- 页码：40-46
- 文件大小：1095 K
摘要
An improved imprinted film-based electrochemical sensor for urea recognition was developed using CdS quantum dots (QDs) doped chitosan as the functional matrix. The microstructure and composition of the imprinted films depicted by scanning electron microscopy (SEM), attenuated total reflection infrared (ATR-IR), X-ray diffraction (XRD), and electrochemical impedance spectroscopy (EIS) indicated the fabricated feasibility of the nanoparticle doped films via in situ electrodeposition. Differential pulse voltammetric responses under the optimal fabrication conditions showed that the sensitivity of CdS QDs-MIP (molecularly imprinted polymer) electrochemical sensor was enhanced from the favorable electron transfer and magnified surface area of CdS QDs with a short adsorption equilibrium time (7 min), wide linear range (5.0 脳 10鈭?2 to 4.0 脳 10鈭?0 M and 5.0 脳 10鈭?0 to 7.0 脳 10鈭? M), and low detection limit (1.0 脳 10鈭?2 M). Meanwhile, the fabricated sensor showed excellent specific recognition to template molecule among the structural similarities and coexistence substances. Furthermore, the proposed sensor was applied to determine the urea in human blood serum samples based on its good reproducibility and stability, and the acceptable recovery implied its feasibility for practical application.