A cotton thread fluidic device with a wall-jet pencil-drawn paper based dual electrode detector.

A cotton thread fluidic device with a wall-jet pencil-drawn paper based dual electrode detector.
Anal Chim Acta. 2018 Dec 21;1040:74-80
Authors: Dossi N, Toniolo R, Terzi F, Sdrigotti N, Tubaro F, Bontempelli G
Abstract
A simple and sensitive device is presented based on the use of pencil-drawn paper based electrochemical detector placed at the end of a cotton thread fluidic channel in wall-jet configuration. This innovative and fast responding electroanalytical system can be adopted for both single and dual electrode electrochemical detection, this last achieved by applying two different potentials at two independent working electrodes drawn on the opposite faces of the paper based detector. Its performance was preliminarily optimized by adopting hexacyanoferrate(II) as probe species undergoing reversible electrochemical processes. These devices were then used for the single electrode detection of ascorbic acid in aqueous samples and the dual electrode detection of orthodiphenols in extra virgin olive oils (EVOOs). In fact, these devices enable hydrophilic orthodiphenols, typically present in EVOOs (extracted by a 80:20% v/v acetonitrile/water mixture), to be discriminated from hydrophilic monophenols instead present in almost all vegetable oils. Flow-injections runs were conducted by using a 0.01 M H2SO4 + 0.5 KCl running electrolyte allowing the rapid and selective detection of hydrophilic orthodiphenols with satisfactory sen...

Source: Analytica Chimica Acta - October 18, 2018 Category: Chemistry Authors: Dossi N, Toniolo R, Terzi F, Sdrigotti N, Tubaro F, Bontempelli G Tags: Anal Chim Acta Source Type: research