Microchimica Acta

, Volume 171, Issue 3–4, pp 423–429 | Cite as

Molecular imprinting polymer electrosensor based on gold nanoparticles for theophylline recognition and determination

  • Xianwen Kan
  • Tingting Liu
  • Hong Zhou
  • Chen Li
  • Bin Fang
Original Paper

Abstract

An electrochemical sensor for theophylline (ThPh) was prepared by electropolymerizing o-phenylenediamine on a glassy carbon electrode in the presence of ThPh via cyclic voltammetry, followed by deposition of gold nanoparticles using a potentiostatic method. The effects of pH, ratio between template molecule and monomer, number of cycles for electropolymerization, and of the solution for extraction were optimized. The current of the electro-active model system hexacyanoferrate(III) and hexacyanoferrate(IV) decreased linearly with successive addition of ThPh in the concentration range between 4.0 × 10−7 ~ 1.5 × 10−5 mol·L−1 and 2.4 × 10−4 ~ 3.4 × 10−3 mol·L−1, with a detection limit of 1.0 × 10−7 mol·L−1. The sensor has an excellent recognition capability for ThPh compared to structurally related molecules, can be regenerated and is stable.

Figure

In this paper, an electrochemical sensor for theophylline (ThPh) was prepared by electropolymerizing o-phenylenediamine (o-PD) on a glassy carbon electrode in the presence of ThPh via cyclic voltammetry, followed by deposition of gold nanoparticles to enhance the sensitivity of the sensor. Therefore, the sensor showed a high sensitivity for ThPh determining. Peak current of [Fe(CN)6]3−/[Fe(CN)6]4− varied linearly with the concentration of ThPh in the range of 4.0×10-7~1.5×10-5 mol·L-1 and 2.4×10-4~3.4×10-3 mol·L-1, and the detection limit reached 1.0×10-7 mol·L-1. Compared to structurally related molecules, the sensor also has a high recognition capability for ThPh. With excellent regeneration property and stability, the present sensor maybe provides a new class of polymer modified electrodes for sensor applications.

Keywords

Molecular imprinted polymer Electrochemical sensor Au nanoparticles Theophylline Recognition 

Notes

Acknowledgements

We greatly appreciate the support of the National Natural Science Foundation of China for General program (20675001) and young program (21005002), Anhui University Provincial Natural Science Foundation Key program (KJ2010A138), Dr Start-up Fundation of Anhui Normal University (160-750834).

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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • Xianwen Kan
    • 1
  • Tingting Liu
    • 1
  • Hong Zhou
    • 1
  • Chen Li
    • 1
  • Bin Fang
    • 1
  1. 1.College of Chemistry and Materials Science, Anhui Key Laboratory of Chemo-BiosensingAnhui Normal UniversityWuhuPeople’s Republic of China

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