Electrochemical synthesis and characterization of poly(thionine)-deep eutectic solvent/carbon nanotube-modified electrodes and application to electrochemical sensing

Dalkıran B., Fernandes I. P. G., David M., Brett C. M. A.

MICROCHIMICA ACTA, cilt.187, sa.11, 2020 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 187 Sayı: 11
  • Basım Tarihi: 2020
  • Doi Numarası: 10.1007/s00604-020-04588-x
  • Dergi Adı: MICROCHIMICA ACTA
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Analytical Abstracts, Aqualine, Aquatic Science & Fisheries Abstracts (ASFA), Biotechnology Research Abstracts, Chemical Abstracts Core, Chimica, Communication Abstracts, EMBASE, Food Science & Technology Abstracts, MEDLINE, Metadex, Pollution Abstracts, Civil Engineering Abstracts
  • Anahtar Kelimeler: Ethaline deep eutectic solvent, Electropolymerization, Poly(thionine), Carbon nanotubes, Biosensor, Uric acid, URIC-ACID BIOSENSOR, ASCORBIC-ACID, CARBON NANOTUBES, GRAPHENE OXIDE, FILM, DOPAMINE, SOLVENTS, SENSOR, ELECTROPOLYMERIZATION, OPTIMIZATION
  • Ankara Üniversitesi Adresli: Hayır

Özet

Electropolymerization of thionine (TH) on multiwalled carbon nanotube (MWCNT)-modified glassy carbon electrodes (GCE) in ethaline deep eutectic solvent (DES) was carried out for the first time, to prepare poly(thionine) (PTH) films with different nanostructured morphologies. PTH films were formed on MWCNT/GCE by potential cycling electropolymerization in ethaline with the addition of different acid dopants CH3COOH, HClO4, HNO3, H(2)SO(4)and HCl, acetic acid being the best. The electropolymerization process was monitored with an electrochemical quartz crystal microbalance. The polymerization scan rate was a key factor affecting the electrochemical and morphological properties of the PTHEthaline-CH3COOH/MWCNT/GCE; electrodeposition at 200 mV s(-1)showing the best performance. The PTH/MWCNT/GCE platform was characterized using cyclic and differential pulse voltammetry, electrochemical impedance spectroscopy and scanning electron microscopy. The analytical characteristics of the PTH films were evaluated for sensing of ascorbic acid and biosensing of uric acid. The developed sensor exhibited a low detection limit (1.1 mu M), wide linear range (2.8-3010 mu M) and high sensitivity (1134 mu A cm(-2) mM(-1)) for ascorbic acid. After immobilization of uricase, UOx, on PTH/MWCNT/GCE, the biosensor was successfully applied to the determination of uric acid, with fast response (< 7 s), good sensitivity (450 mu A cm(-2) mM(-1), wide linear range (0.48-279 mu M) and low detection limit (58.9 nM), better than in the literature and than with PTH prepared in aqueous solution. The determination of uric acid in synthetic urine samples was successfully tested and the mean analytical recovery was 100.8 +/- 1.4%. This is a promising approach for the determination of uric acid in real samples.