Issue 37, 2023

Simultaneous detection of dopamine and ascorbic acid by using a thread-based microfluidic device and multiple pulse amperometry

Abstract

This study presents a novel approach for the simultaneous detection of ascorbic acid (AA) and dopamine (DA) using an affordable and user-friendly microfluidic device. Microfluidic devices, when combined with electrochemical detectors like screen-printed electrodes (SPEs), offer numerous advantages such as portability, high sample throughput, and low reagent consumption. In this study, a 3D-printed microfluidic device called a μTED was developed, utilizing textile threads as microfluidic channels and an unmodified SPE as the amperometric detector. The method employed multiple pulse amperometry (MPA) with carefully selected potential values (+0.65 V and −0.10 V). The reduction current signals generated by dopamine o-quinone were used to calculate a correction factor for the oxidation signals of ascorbic acid, enabling simultaneous quantification. The developed microfluidic device ensured a stable flow rate of the carrier solution at 1.19 μL s−1, minimizing the consumption of samples and reagents (injection volume of 2.0 μL). Under the optimized experimental conditions, a linear range from 50 to 900 μmol L−1 was achieved for both DA and AA. The obtained sensitivities were 2.24 μA L mmol−1 for AA and 5.09 μA L mmol−1 for DA, with corresponding limits of detection (LOD) of 2.60 μmol L−1 and 1.54 μmol L−1, respectively. To confirm the effectiveness of the proposed method, it was successfully applied to analyze AA and DA in a commercial blood serum sample spiked at three different concentration levels, with a medium recovery rate of 70%. Furthermore, the MPA technique demonstrated its simplicity by enabling the simultaneous determination of AA and DA without the need for prior separation steps or the use of chemically modified electrodes.

Graphical abstract: Simultaneous detection of dopamine and ascorbic acid by using a thread-based microfluidic device and multiple pulse amperometry

Supplementary files

Article information

Article type
Paper
Submitted
03 Mey 2023
Accepted
24 Aga 2023
First published
04 Sep 2023

Anal. Methods, 2023,15, 4862-4869

Simultaneous detection of dopamine and ascorbic acid by using a thread-based microfluidic device and multiple pulse amperometry

V. W. dos Santos, G. Martins, J. L. Gogola, C. Kalinke, D. Agustini, M. F. Bergamini and L. H. Marcolino-Junior, Anal. Methods, 2023, 15, 4862 DOI: 10.1039/D3AY00693J

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