Highly Selective Electrochemical Determination of Taxol Based on ds-DNA-Modified Pencil Electrode

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• 作者：M. Taei ; F. Hassanpour ; H. Salavati ; Z. Sadeghi…
• 关键词：Biosensor ; TiO2/ZrO2 nanocomposite ; Chitosan ; modified multiwall carbon nanotubes ; Voltammetry
• 刊名：Applied Biochemistry and Biotechnology
• 出版年：2015
• 出版时间：May 2015
• 年：2015
• 卷：176
• 期：2
• 页码：344-358
• 全文大小：912 KB
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• 作者单位：M. Taei (1)
  F. Hassanpour (1)
  H. Salavati (1)
  Z. Sadeghi (1)
  H. Alvandi (1)
  
  1. Chemistry Department, Payame Noor University, 19395-4697, Tehran, Iran
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Biotechnology
  Biochemistry
  
• 出版者：Humana Press Inc.
• ISSN：1559-0291

文摘

In this research, TiO₂/ZrO₂ nanocomposite has been prepared using sol-gel method. The TiO₂/ZrO₂ composite was characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and transmission electron microscopy (TEM). A sensitive electrochemical biosensor is also presented for the determination of Taxol based on ds-DNA decorated multiwall carbon nanotubes-TiO₂/ZrO₂–chitosan-modified pencil electrode (ds-DNA-MWNTs-TiO₂/ZrO₂–CHIT-PGE). The UV spectroscopic data and differential pulse voltammetry revealed that there is a strong interaction between ds-DNA and Taxol. The groove binding of Taxol to ds-DNA helix has been characterized by a red shift (less than 8?nm) in wavelength and the decrease in the differential pulse voltammetry oxidation signal intensity of the Taxol at pencil graphite electrode (PGE) after its interaction with ds-DNA. Finally, a pretreated PGE modified with ds-DNA-MWNTs-TiO₂/ZrO₂–CHIT was tested in order to determine Taxol content in the solution. The dynamic range was from 0.7 to 1874.0?nmol?L? with a detection limit of 0.01?nmol?L?. This sensing platform was successfully applied for the determination of Taxol in pharmaceutical and biological samples.