| Autor: |
Enache TA; Laboratory of Functional Nanostructures, National Institute of Materials Physics, Atomistilor 405A, 077125 Magurele, Romania., Enculescu M; Laboratory of Functional Nanostructures, National Institute of Materials Physics, Atomistilor 405A, 077125 Magurele, Romania., Bunea MC; Laboratory of Functional Nanostructures, National Institute of Materials Physics, Atomistilor 405A, 077125 Magurele, Romania., Zubillaga EA; NAITEC, C/Tajonar 20, 31006 Pamplona, Spain., Tellechea E; NAITEC, C/Tajonar 20, 31006 Pamplona, Spain., Aresti M; NAITEC, C/Tajonar 20, 31006 Pamplona, Spain., Lasheras M; NAITEC, C/Tajonar 20, 31006 Pamplona, Spain., Asensio AC; Mateprincs S.L., Centro Stirling, Carretera de Tafalla 10, 31132 Villatuerta, Spain., Diculescu VC; Laboratory of Functional Nanostructures, National Institute of Materials Physics, Atomistilor 405A, 077125 Magurele, Romania. |
| Abstrakt: |
Due to the great significance of amino acids, a substantial number of research studies has been directed toward the development of effective and reliable platforms for their evaluation, detection, and identification. In order to support these studies, a new electrochemical platform based on PANI/ZnO nanowires' modified carbon inks screen-printed electrodes was developed for qualitative analysis of electroactive amino acids, with emphasis on tyrosine (Tyr) and tryptophan (Trp). A comparative investigation of the carbon ink before and after modification with the PANI/ZnO was performed by scanning electron microscopy and by Raman spectroscopy, confirming the presence of PANI and ZnO nanowires. Electrochemical investigations by cyclic voltammetry and electrochemical impedance spectroscopy have shown a higher charge-transfer rate constant, which is reflected into lower charge-transfer resistance and higher capacitance values for the PANI/ZnO modified ink when compared to the simple carbon screen-printed electrode. In order to demonstrate the electrochemical performances of the PANI/ZnO nanowires' modified carbon inks screen-printed electrodes for amino acids analysis, differential pulse voltammograms were obtained in individual and mixed solutions of electroactive amino acids. It has been shown that the PANI/ZnO nanowires' modified carbon inks screen-printed electrodes allowed for tyrosine and tryptophan a peak separation of more than 100 mV, enabling their screening and identification in mixed solutions, which is essential for the electrochemical analysis of proteins within the proteomics research field. |
