Molecularly Imprinted Quartz Crystal Microbalance Sensor (QCM) for Bilirubin Detection
1
Department of Chemistry, Hacettepe University, 06800 Ankara, Turkey
2
Department of Chemical Technology, Abant İzzet Baysal University, 14900 Bolu, Turkey
*
Author to whom correspondence should be addressed.
Academic Editor: Peter Lieberzeit
Chemosensors 2016, 4(4), 21; https://doi.org/10.3390/chemosensors4040021
Received: 22 August 2016 / Revised: 24 October 2016 / Accepted: 31 October 2016 / Published: 18 November 2016
(This article belongs to the Special Issue Molecularly Imprinted Polymers—Robust Artificial Receptor Materials for Chemical Sensing)
This study aims the preparation of a QCM sensor for the detection of bilirubin in human plasma. Bilirubin-imprinted poly-(2-hydroxyethyl methacrylate-N-methacryloyl-l-tryptophan methyl ester) (PHEMATrp) nanofilm (MIP) on the gold surface of a QCM chip was synthesized by the molecular imprinting technique. Meanwhile, the non-imprinted PHEMATrp (NIP) nanofilm was synthesized by the same experimental technique to examine the imprinting effect. Characterization of MIP and NIP nanofilms on the QCM chip surface was achieved by atomic force microscopy (AFM), ellipsometry, Fourier transform infrared spectrophotometry-attenuated total reflectance (FTIR-ATR) and contact angle measurements (CA). The observations indicated that the nanofilm was almost in a monolayer. Thereinafter, the imprinted and the non-imprinted QCM chips were connected to the QCM system to investigate kinetic and affinity properties. In order to examine the selectivity of the MIP-PHEMATrp nanofilm, competitive adsorption of bilirubin with cholesterol and estradiol was performed. Limit of detection (LOD) and limit of quantitation (LOQ) values were calculated as 0.45 μg/mL and 0.9 μg/mL, respectively.
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Keywords:
molecular imprinting technique; bilirubin; QCM; PHEMA; nanosensor
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MDPI and ACS Style
Çiçek, Ç.; Yılmaz, F.; Özgür, E.; Yavuz, H.; Denizli, A. Molecularly Imprinted Quartz Crystal Microbalance Sensor (QCM) for Bilirubin Detection. Chemosensors 2016, 4, 21.
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