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Preparation of paper-based devices for reagentless electrochemical (bio)sensor strips

Nature Protocols
Numero: 14
Data pubblicazione: 03/07/2019


Autori:
Nome: Stefano
Cognome: Cinti
Affiliazione: Dipartimento di Farmacia, Università di Napoli Federico II

Nome: Danila
Cognome: Moscone
Affiliazione: Dipartimento di Scienze e Tecnologie Chimiche, Università di Roma Tor Vergata

Nome: Fabiana
Cognome: Arduini
Affiliazione: Dipartimento di Scienze e Tecnologie Chimiche, Università di Roma Tor Vergata


Abstract: Despite substantial advances in sensing technologies, the development, preparation, and use of self-testing devices is still confined to specialist laboratories and users. Decentralized analytical devices will enormously impact daily lives, enabling people to analyze diverse clinical, environmental, and food samples, evaluate them and make predictions to improve quality of life, particularly in remote, resource-scarce areas. In recent years, paper-based analytical tools have attracted a great deal of attention; the well-known properties of paper, such as abundance, affordability, lightness, and biodegradability, combined with features of printed electrochemical sensors, have enabled the development of sustainable devices that drive (bio)sensors b! eyond the state of the art. Their blindness toward colored/turbid matrices (i.e., blood, soil), their portability, and the capacity of paper to autonomously filter/purge/react with target species make such devices powerful in establishing point-of-need tools for use by non-specialists. This protocol describes the preparation of a voltammetric phosphate sensor and an amperometric nerve agent biosensor; both platforms produce quantitative measurements with currents in the range of microamperes. These printed strips comprise three electrodes (graphite for working and counter electrodes and silver/silver chloride (Ag/AgCl) for the reference electrode) and nanomodifiers (carbon black and Prussian blue) to improve their performance and specificity. Depending on analytical need, different types of paper (filter, office) and configurations (1D, 2D, 3D) can be adopted. The protocol, based on the use of cost-effective manufacturing techniques such as drop casting (to chemically modify the sub! strate su rface) and wax/screen printing (for creating the channels and electrodes), can be completed in

Indirizzo: https://www.nature.com/articles/s41596-019-0186-y


 
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