Evaluation of electrochemical quartz crystal microbalance based sensor modified by uric acid-imprinted polypyrrole

Deivis Plausinaitis; Linas Sinkevicius; Urte Samukaite-Bubniene; Vilma Ratautaite; Arunas Ramanavicius

doi:10.1016/j.talanta.2020.121414

Evaluation of electrochemical quartz crystal microbalance based sensor modified by uric acid-imprinted polypyrrole

Talanta. 2020 Dec 1:220:121414. doi: 10.1016/j.talanta.2020.121414. Epub 2020 Jul 18.

Authors

Deivis Plausinaitis¹, Linas Sinkevicius¹, Urte Samukaite-Bubniene², Vilma Ratautaite³, Arunas Ramanavicius⁴

Affiliations

¹ Vilnius University, Faculty of Chemistry and Geosciences, Institute of Chemistry, Department of Physical Chemistry, Naugarduko str. 24, LT-03225, Vilnius, Lithuania.
² Vilnius University, Faculty of Chemistry and Geosciences, Institute of Chemistry, Department of Physical Chemistry, Naugarduko str. 24, LT-03225, Vilnius, Lithuania; NanoTechnas - Center of Nanotechnology and Materials Science at Vilnius University, Faculty of Chemistry and Geosciences, Naugarduko str. 24, LT-03225, Vilnius, Lithuania; State Research Institute Centre for Physical Sciences and Technology, Department of Functional Materials and Electronics, Sauletekio ave. 3, Vilnius, Lithuania.
³ Vilnius University, Faculty of Chemistry and Geosciences, Institute of Chemistry, Department of Physical Chemistry, Naugarduko str. 24, LT-03225, Vilnius, Lithuania; State Research Institute Centre for Physical Sciences and Technology, Department of Functional Materials and Electronics, Sauletekio ave. 3, Vilnius, Lithuania.
⁴ Vilnius University, Faculty of Chemistry and Geosciences, Institute of Chemistry, Department of Physical Chemistry, Naugarduko str. 24, LT-03225, Vilnius, Lithuania; NanoTechnas - Center of Nanotechnology and Materials Science at Vilnius University, Faculty of Chemistry and Geosciences, Naugarduko str. 24, LT-03225, Vilnius, Lithuania; State Research Institute Centre for Physical Sciences and Technology, Department of Functional Materials and Electronics, Sauletekio ave. 3, Vilnius, Lithuania. Electronic address: arunas.ramanavicius@chf.vu.lt.

PMID: 32928426
DOI: 10.1016/j.talanta.2020.121414

Abstract

Uric acid-imprinted polypyrrole-based (MIP_(UA)-Ppy) electrochemical quartz crystal microbalance sensor (EQCM) was developed. Experiments and theoretical calculations were focused on molecular interactions between uric acid molecule and: i) polypyrrole imprinted by uric acid (MIP_(UA)-Ppy) ii) polypyrrole film without any molecular imprints (NIP-Ppy). Resonant frequency differences during electrochemical deposition of MIP_(UA)-Ppy and NIP-Ppy films were observed and were attributed to the phenomenon of molecule capture within formed Ppy matrix. EQCM-resonators modified by MIP-Ppy showed the following advantages: selectivity, qualitative response, cost-effectiveness, and simple procedure. The selectivity of MIP_(UA)-Ppy was tested by the replacement of uric acid in the PBS solution with several different concentrations of caffeine and glucose. Langmuir isotherm based molecular adsorption model was applied to evaluate the interaction of MIP_(UA)-Ppy with uric acid. From experimental results calculated the standard Gibbs free energy of association (ΔG_a) of uric acid with MIP_(UA)-Ppy is -16.4 ± 2.05 kJ/mol and with NIP-Ppy is -13.3 ± 8.56 kJ/mol ΔG values illustrate that the formation of uric acid complex with MIP_(UA)-Ppy is thermodynamically more favourable than that for complexation with NIP-Ppy.

Keywords: EQCM-Resonator; Electrochemical quartz crystal microbalance (EQCM); Molecularly imprinted polymer; Molecularly imprinted polypyrrole (MIP-Ppy); Polypyrrole (Ppy); Uric acid.