Screen-Printed Electrodes as a Platform for Smart and Low-Cost Point of Care Devices

Pesticides are among the most important contaminants in food, leading to important global health problems. While conventional techniques such as high-performance liquid chromatography (HPLC) and mass spectrometry (MS) have traditionally been utilized for the detection of such food contaminants, they are relatively expensive, time-consuming and labor intensive, limiting their use for point-of-care (POC) applications. Electrochemical (bio)sensors are emerging devices meeting such expectations, since they represent reliable, simple, cheap, portable, selective and easy to use analytical tools that can be used outside the laboratories by non-specialized personnel. Screen-printed electrodes (SPEs) stand out from the variety of transducers used in electrochemical (bio)sensing because of their small size, high integration, low cost and ability to measure in few microliters of sample. In this context, in this review article, we summarize and discuss about the use of SPEs as analytical tools in the development of (bio)sensors for pesticides of interest for food control. Finally, aspects related to the analytical performance of the developed (bio)sensors together with prospects for future improvements are discussed.

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Toward the development of smart and low cost point-of-care biosensors based on screen printed electrodes

Critical Reviews in Biotechnology ◽

10.3109/07388551.2014.992387 ◽

2015 ◽

pp. 1-11 ◽

Cited By ~ 32

Author(s):

Minhaz Uddin Ahmed ◽

Mohammad Mosharraf Hossain ◽

Mohammadali Safavieh ◽

Yen Lu Wong ◽

Ibrahim Abd Rahman ◽

...

Keyword(s):

Point Of Care ◽

Low Cost ◽

Screen Printed Electrodes ◽

Screen Printed

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Sensing CA 15-3 in point-of-care by electropolymerizing O-phenylenediamine (oPDA) on Au-screen printed electrodes

PLoS ONE ◽

10.1371/journal.pone.0196656 ◽

2018 ◽

Vol 13 (5) ◽

pp. e0196656 ◽

Cited By ~ 11

Author(s):

Rui S. Gomes ◽

Felismina T. C. Moreira ◽

Ruben Fernandes ◽

M. Goreti F. Sales

Keyword(s):

Point Of Care ◽

Screen Printed Electrodes ◽

Screen Printed

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Electrochemical Properties of Screen-Printed Carbon Nano-Onion Electrodes

Molecules ◽

10.3390/molecules25173884 ◽

2020 ◽

Vol 25 (17) ◽

pp. 3884

Author(s):

Loanda R. Cumba ◽

Adalberto Camisasca ◽

Silvia Giordani ◽

Robert J. Forster

Keyword(s):

High Performance ◽

Electrode Materials ◽

Limit Of Detection ◽

Low Cost ◽

Analytical Sensitivity ◽

High Performing ◽

Carbon Particles ◽

Screen Printed Electrodes ◽

Ink Formulation ◽

Screen Printed

The properties of carbon nano-onions (CNOs) make them attractive electrode materials/additives for the development of low-cost, simple to use and highly sensitive Screen Printed Electrodes (SPEs). Here, we report the development of the first CNO-based ink for the fabrication of low-cost and disposable electrodes, leading to high-performance sensors. Achieving a true dispersion of CNOs is intrinsically challenging and a key aspect of the ink formulation. The screen-printing ink formulation is achieved by carefully selecting and optimising the conductive materials (graphite (GRT) and CNOs), the polymer binder, the organic solvent and the plasticiser. Our CNO/GRT-based screen-printed electrodes consist of an interconnected network of conducting carbon particles with a uniform distribution. Electrochemical studies show a heterogeneous electron transfer rate constant of 1.3 ± 0.7 × 10−3 cm·s−1 and a higher current density than the ferrocene/ferrocenium coupled to a commercial graphite SPEs. In addition, the CNO/GRT SPE can detect dopamine in the concentration range of 10.0–99.9 µM with a limit of detection of 0.92 µM (N = 3). They exhibit a higher analytical sensitivity than the commercial graphite-based SPE, with a 4-fold improvement observed. These results open up the possibility of using high-performing CNO-based SPEs for electrochemical applications including sensors, battery electrodes and electrocatalysis.

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