Newly designed dual-mode electrochemical sensor onto a single polydimethylsiloxane-based chip

Autor(es)

Maximiano, Elizabete Maria ^[1] ; Sequinel, Thiago ^[1] ; Martins, Caue Alves ^[2] ; Angnes, Lucio ^[3] ; Trindade, Magno Aparecido Goncalves ^{[1, 4]}

Afiliação do(s) autor(es)

^[1] Fundacao Univ Fed Grande Dourados, Fac Ciencias Exatas & Tecnol, Rodovia Dourados Itahum, Km 12, BR-79804970 Dourados, MS - Brazil

^[2] Univ Fed Mato Grosso do Sul, Inst Phys, BR-79070900 Campo Grande, MS - Brazil

^[3] Univ Sao Paulo, Dept Quim Fundamental, Inst Quim, Av Prof Lineu Prestes 748, BR-05508000 Sao Paulo, SP - Brazil

^[4] UNESP, Inst Chem, Natl Inst Alternat Technol Detect Toxicol Evaluat, BR-14800900 Araraquara, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Talanta; v. 221, JAN 1 2021.
• Citações Web of Science: 0

Resumo

Here we present a planar polydimethylsiloxane (PDMS)-based millifluidic device in which the channel (at a serpentine-shape) and a new design of electrochemical sensor (dual-mode detection) are assembled into a single chip. The platform makes use of a fully integrated reservoir to place the reference electrode, separating it from the flowing stream. The device was properly characterized aiming to evaluate the influences of channel geometries and diameters, and the electrochemical properties were improved compared with the classical reference electrode configuration. To investigate the applicability of the proposed millifluidic device, amperometric detection was used for the analysis of tap and lake water as well as groundwater samples to determine salicylic acid - selected as a model analyte. Our experimental results have demonstrated a successful prospect as amperometric detection in PDMS-based chip and showed high tolerance to disturbance by external action provided in the use of electronic micropipette and no surface inactivation from sample-interference. (AU)

• Processo FAPESP: 14/50867-3 - INCT 2014: Instituto Nacional de Ciência e Tecnologia de Bioanalítica
• Beneficiário: Marco Aurelio Zezzi Arruda
• Modalidade de apoio: Auxílio à Pesquisa - Temático