An ultrasensitive human cardiac troponin T graphene screen-printed electrode based on electropolymerized-molecularly imprinted conducting polymer
Time: 2016-03-23 02:06  Click:423
Biosensors and Bioelectronics

Volume 77, 15 March 2016, Pages 978–985

Bárbara V.M. Silvaa,Blanca A.G. Rodrígueza,Goreti F. Salesb,Maria Del Pilar T. Sotomayorc,Rosa F. Dutraa
a Biomedical Engineering Laboratory, Federal University of Pernambuco, Recife, Brazil
b BioMark/ISEP, School of Engineering, Polytechnic Institute of Porto, Porto, Portugal
c Chemistry Institute, State University of São Paulo (UNESP), Araraquara, Brazil
A nano-molecularly imprinted polymer (N-MIP) assembled on a screen-printed electrode for the cardiac troponin T (cTnT) was developed. The biomimetic surface was obtained by a co-polymer matrix assembled on the reduced graphene oxide (RGO) electrode surface. The cTnT active sites were engineered using pyrrole and carboxylated pyrrole that was one-step electropolymerized jointly with cTnT by cyclic voltammetry. The stepwise preparation of the biomimetic surface was characterized by cyclic and differential pulse voltammetries using the ferrocyanide/ferricyanide as redox probe. Structural and morphological characterization was also performed. The optimal relation of pyrrole and pyrrole-3-acid carboxylic to perform the cTnT biomimetic nanosurface was obtained at 1:5 ratio. The analytical performance of cTnT N-MIP performed by differential pulse voltammetry showed a linear range from 0.01 to 0.1 ng mL−1 (r=0.995, p«0.01), with a very low limit of detection (0.006 ng mL−1). The synergic effect of conductive polymer and graphene forming 3D structures of reactive sites resulted in a N-MIP with excellent affinity to cTnT binding (KD=7.3 10−13 mol L−1). The N-MIP proposed is based on a simple method of antibody obtaining with a large potential for point-of-care testing applications.
Cardiac troponin T;Molecularly imprinted polymer;Pyrrole;Acid carboxylic-3-pyrrole;Graphene;Point-of-care testing
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