A portable system for photoelectrochemical detection of lactate on TiO2 nanoparticles and [Ni(salen)] polymeric film

[Display omitted] •A miniaturized system for photoelectroanalysis with printed electrode was developed.•TiO2 with [Ni(salen)] polymeric film were used in PEC sensors.•The PEC sensor exhibited excellent selectivity and stability for lactate.•In situ FTIR confirmed that CO2 was the major product of la...

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Bibliographic Details
Published in:Sensors and actuators. B, Chemical Chemical, 2021-10, Vol.345, p.130390, Article 130390
Main Authors: Bott-Neto, José L., Martins, Thiago S., Buscaglia, Lorenzo A., Santiago, Patrícia V.B., Fernández, Pablo S., Machado, Sergio A.S., Oliveira Jr, Osvaldo N.
Format: Article
Language:English
Subjects:
Carbon dioxide
Coated electrodes
Fourier transforms
In Situ FTIR
Lactate
Light emitting diodes
Nanoparticles
Photoelectrochemical sensor
Polymer [Ni(salen)]
Polymer films
Polymers
Portability
Selectivity
Three dimensional printing
TiO2
Titanium dioxide
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Summary:[Display omitted] •A miniaturized system for photoelectroanalysis with printed electrode was developed.•TiO2 with [Ni(salen)] polymeric film were used in PEC sensors.•The PEC sensor exhibited excellent selectivity and stability for lactate.•In situ FTIR confirmed that CO2 was the major product of lactate photoelectrooxidationt.•This device can be applied for photoelectrochemical analysis of other biomolecules. In this paper we present a portable photoelectrochemical system developed with screen-printed carbon electrodes (SPCEs) and a 3 W light-emitting diode (LED). The device with 3D printed structure was applied for detecting lactate on TiO2 nanoparticles modified with [Ni(salen)] polymer film (referred to as TiO2@poly[Ni(salen)]). Electrode coating with the polymer increased the sensitivity of the photoelectrochemical sensor, resulting in a linear range from 0.1 to 20 mmol L−1 with a limit of detection (LOD) of 88 μmol L−1. The sensing system exhibited excellent stability, reproducibility, and selectivity. We also demonstrated by in situ Fourier-transform infrared spectroscopy (FTIR) measurements that carbon dioxide (CO2) is the main product from photoelectrooxidation of lactate on TiO2@poly[Ni(salen)]. The portable system can be employed with any type of modified electrodes to function as photoelectroanalytical (bio)sensors, especially for point-of-care diagnostics.
ISSN:0925-4005
1873-3077
DOI:10.1016/j.snb.2021.130390