Novel eco-friendly water-based conductive ink for the preparation of disposable screen-printed electrodes for sensing and biosensing applications

Author(s)

Camargo, Jessica Rocha ; Silva, Tiago Almeida ; Rivas, Gustavo A. ; Janegitz, Bruno C.

• Document type: Journal article
• Source: Electrochimica Acta; v. 409, p. 9-pg., 2022-03-20.

Abstract

This paper presents a novel water-based conductive ink obtained by proper combination of chitosan (C) biopolymer, graphite (G) powder, and glycerol (G), and its subsequent use in the screen-printing of disposable electrodes on polyethylene terephthalate (PET) plastic obtained from recyclable soda bottles (CGG/PET electrodes). The electrode was used in two directions, as a sensor for the quantification of uric acid and as a biosensor for the enzymatic quantification of catechol. The linear sweep voltammetrydetection of uric acid (UA), showed a linear range between 8.0 and 500 mu mol L-1 and a limit of detection (LOD) of 0.36 mu mol L-1. Additionally, the performance of the resulting electrodes for biosensing purposes was evaluated through the development of a catechol biosensor by the modification of the GCG/PET surface with the tyrosinase (Tyr) enzyme, multiwalled carbon nanotubes (MWCNTs), and dyhexadecyl phosphate (DHP) (Tyr-MWCNT-CGG/PET). Using the chronoamperometry technique a linear relationship from 0.5 to 50 mu mol L-1 and LOD of 0.3 mu mol L-1 were achivied for catechol. The proposed electrode has demonstrated outstanding analytical characteristics, proving its potential as a disposable, low-cost, and environmentally friendly platform for electrochemical sensing and biosensing purposes. (C) 2022 Elsevier Ltd. All rights reserved. (AU)

• FAPESP's process: 17/21097-3 - Bee-agriculture interactions: perspectives to sustainable use
• Grantee: Osmar Malaspina
• Support Opportunities: BIOTA-FAPESP Program - Thematic Grants
• FAPESP's process: 19/23177-0 - Development of disposable devices with conductive inks and low cost substrates for the biosensing of hormonal dysfunctions and detection of Malaria
• Grantee: Jéssica Rocha Camargo
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)