Fabrication and modification of homemade paper-based electrode systems

Khan, M. Azizur R.; Vieira, Catarina A.C.; Riu, Jordi; Sales, M. Goreti F.

doi:10.1016/j.talanta.2020.121861

Cited by 9 publications

(3 citation statements)

References 37 publications

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“…For this work, a commercial AgCl/Ag ink was initially used to prepare Cl – sensors because such inks are commonly used as ion-to-electron transducers in paper-based electrochemical devices. ,,,,, Besides Ag nanoparticles and AgCl, this ink also contained according to the supplier a urethane acrylate oligomer and γ-butyrolactone. We first examined the performance of the AgCl/Ag ink using 100 mL beakers to contain the samples.…”

Section: Resultsmentioning

confidence: 99%

The Effect of Paper on the Detection Limit of Paper-Based Potentiometric Chloride Sensors

2022

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While paper is an excellent material for use in many other portable sensors, potentiometric paper-based sensors have been reported to perform worse than conventional rod-shaped electrodes, in particular in view of limits of detection (LODs). Reported here is an in-depth study of the lower LOD for Cl– measurements with paper-based devices comprising AgCl/Ag transducers. Contamination by Cl– from two commonly used device materialsa AgCl/Ag ink and so-called ashless filter paperwas found to increase the concentration of Cl– in paper-contained samples far above what is expected for the spontaneous dissolution of the transducer’s AgCl, thereby worsening lower LODs. In addition, for the case of Ag+, the commonly hypothesized adsorption of metal cations onto filter paper was found not to significantly affect the performance of AgCl/Ag transducers. We note that in the context of chemical analysis, metal impurities of paper are often mentioned in the literature, but Cl– contamination of paper has been overlooked.

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Section: Resultsmentioning

confidence: 99%

The Effect of Paper on the Detection Limit of Paper-Based Potentiometric Chloride Sensors

2022

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“… 32 − 35 These events may be translated by monitoring alterations in optical features, 36 which may involve changes in maximum wavelength reflection/absorption 37 or the enhanced Raman-scattering properties. 38 , 39 Translation by electrochemical properties has also been achieved 40 − 42 by having conductive inks casted on a cellulose substrate 43 or by hand-painting these inks 44 , 45 or using a printer for the same purpose. 46 Although the most well-known cellulose-based PoC approaches are lateral-flow methods, 47 , 48 with a well-known mode of operation that may be translated by naked-eye, optical, or electrochemical detectors.…”

Section: Introductionmentioning

confidence: 99%

“…There are many approaches that have been developed in time to achieve a successful biosensor on cellulose-based substrates, − including cellulose of bacterial origin, much before COVID-19, and they consist of immobilizing specific reagents on these substrates. Generally, this includes reagents that react with a given compound or group of compounds, metal nanoparticles (NPs) with catalytic or plasmonic features , or selective biorecognition elements that capture a wide range of target analytes, − including disease diagnosis. − These events may be translated by monitoring alterations in optical features, which may involve changes in maximum wavelength reflection/absorption or the enhanced Raman-scattering properties. , Translation by electrochemical properties has also been achieved − by having conductive inks casted on a cellulose substrate or by hand-painting these inks , or using a printer for the same purpose . Although the most well-known cellulose-based PoC approaches are lateral-flow methods, , with a well-known mode of operation that may be translated by naked-eye, optical, or electrochemical detectors.…”

Section: Introductionmentioning

confidence: 99%

Paper-Based Biosensors for COVID-19: A Review of Innovative Tools for Controlling the Pandemic

et al. 2021

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The appearance and quick spread of the new severe acute respiratory syndrome coronavirus disease, COVID-19, brought major societal challenges. Importantly, suitable medical diagnosis procedures and smooth clinical management of the disease are an emergent need, which must be anchored on novel diagnostic methods and devices. Novel molecular diagnostic tools relying on nucleic acid amplification testing have emerged globally and are the current gold standard in COVID-19 diagnosis. However, the need for widespread testing methodologies for fast, effective testing in multiple epidemiological scenarios remains a crucial step in the fight against the COVID-19 pandemic. Biosensors have previously shown the potential for cost-effective and accessible diagnostics, finding applications in settings where conventional, laboratorial techniques may not be readily employed. Paper- and cellulose-based biosensors can be particularly relevant in pandemic times, for the renewability, possibility of mass production with sustainable methodologies, and safe environmental disposal. In this review, paper-based devices and platforms targeting SARS-CoV-2 are showcased and discussed, as a means to achieve quick and low-cost PoC diagnosis, including detection methodologies for viral genomic material, viral antigen detection, and serological antibody testing. Devices targeting inflammatory markers relevant for COVID-19 are also discussed, as fast, reliable bedside diagnostic tools for patient treatment and follow-up.

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