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Analytical and Bioanalytical Chemistry

, Volume 410, Issue 18, pp 4387–4395 | Cite as

Preparation of a molecularly imprinted sensor based on quartz crystal microbalance for specific recognition of sialic acid in human urine

  • Xiuzhen QiuEmail author
  • Xian-Yan Xu
  • Xuncai Chen
  • Yiyong Wu
  • Huishi GuoEmail author
Research Paper

Abstract

A novel molecularly imprinted quartz crystal microbalance (QCM) sensor was successfully prepared for selective determination of sialic acid (SA) in human urine samples. To obtain the QCM sensor, we first modified the gold surface of the QCM chip by self-assembling of allylmercaptane to introduce polymerizable double bonds on the chip surface. Then, SA molecularly imprinted polymer (MIP) nanofilm was attached to the modified QCM chip surface. For comparison, we have also characterized the nonmodified and improved surfaces of the QCM sensor by using atomic force microscopy (AFM) and Fourier transform infrared (FTIR) spectroscopy. We then tested the selectivity and detection limit of the imprinted QCM sensor via a series of adsorption experiments. The results show a linear response in the range of 0.025–0.50 μmol L−1 for sialic acid. Moreover, the limit of detection (LOD) of the prepared imprinted QCM sensor was found to be 1.0 nmol L−1 for sialic acid, and high recovery values range from 87.6 to 108.5% with RSD < 8.7 (n = 5) for the spiked urine sample obtained. Overall, this work presents how a novel QCM sensor was developed and used to detect sialic acid in human urine samples.

Graphical abstract

Specific recognition of sialic acid by the MIP-QCM sensor system

Keywords

Sialic acid (SA) Quartz crystal microbalance (QCM) Molecularly imprinted polymer (MIP) Sensor 

Notes

Funding information

This work was financially supported by grants from the Natural Science Foundation of Guangdong Province (Nos. 2014A030307024, 2015A030313750) and the Innovation Projects of the Department of Education of Guangdong Province (2014KTSCX169).

Compliance with ethical standards

The authors declare that all individual participants from whom the serum samples were obtained gave informed consent, and the studies have been approved by the Shaoguan University Ethics Committee and have been performed in accordance with ethical standards.

Conflict of interest

The authors declare that they have no conflict of interest.

Supplementary material

216_2018_1094_MOESM1_ESM.pdf (598 kb)
ESM 1 (PDF 367 kb)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.College of Chemistry and Environmental EngineeringShaoguan UniversityShaoguanChina
  2. 2.School of Chemical and Biomolecular EngineeringThe University of SydneySydneyAustralia

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