Water-Based Conductive Ink Formulations for Enzyme-Based Wearable Biosensors

  • Angelo Tricase
  • , Anna Imbriano
  • , Marlene Valentino
  • , Nicoletta Ditaranto
  • , Eleonora Macchia
  • , Cinzia Di Franco
  • , Reshma Kidayaveettil
  • , Dónal Leech
  • , Matteo Piscitelli
  • , Gaetano Scamarcio
  • , Gaetano Perchiazzi
  • , Luisa Torsi
  • , Paolo Bollella

Research output: Contribution to journalArticleScientificpeer-review

19 Citations (Scopus)
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Abstract

Herein, this work reports the first example of second-generation wearable biosensor arrays based on a printed electrode technology involving a water-based graphite ink, for the simultaneous detection of l-lactate and d-glucose. The water-based graphite ink is deposited onto a flexible polyethylene terephthalate sheet, namely stencil-printed graphite (SPG) electrodes, and further modified with [Os(bpy)2(Cl)(PVI)10] as an osmium redox polymer to shuttle the electrons from the redox center of lactate oxidase from Aerococcus viridans (LOx) and gluocose oxidase from Aspergillus niger (GOx). The proposed biosensor array exhibits a limit of detection as low as (9.0 ± 1.0) × 10−6 m for LOx/SPG-[Os(bpy)2(Cl)(PVI)10] and (3.0 ± 0.5) × 10−6 m for GOx/SPG-[Os(bpy)2(Cl)(PVI)10], a sensitivity as high as 1.32 μA mm−1 for LOx/SPG-[Os(bpy)2(Cl)(PVI)10] and 28.4 μA mm−1 for GOx/SPG-[Os(bpy)2(Cl)(PVI)10]. The technology is also selective when tested in buffer and artificial sweat and is endowed with an operational/storage stability of ≈80% of the initial signal retained after 20 days. Finally, the proposed array is integrated in a wristband and successfully tested for the continuous monitoring of l-lactate and d-glucose in a healthy volunteer during daily activity. This is foreseen as a real-time wearable device for sport-medicine and healthcare applications.
Original languageEnglish
JournalAdvanced Sensor Research
Volume3
Issue number3
DOIs
Publication statusPublished - 25 Apr 2023
MoE publication typeA1 Journal article-refereed

Funding

The following funding agencies are acknowledged: Academy of Finland projects #316881, #316883 “Spatiotemporal control of Cell Functions,” #332106 “ProSiT—Protein Detection at the Single-Molecule Limit with a Self-powered Organic Transistor for HIV early diagnosis”; Biosensori analitici usa-e getta a base di transistori organici auto-alimentati per la rivelazione di biomarcatori proteomici alla singola molecola per la diagnostica decentrata dell'HIV (6CDD3786); Research for Innovation REFIN—Regione Puglia POR PUGLIA FESR-FSE 2014/2020; PMGB ARS01_01195; NoOne-A binary sensor with single-molecule digit to discriminate biofluids enclosing zero or at least one biomarker, ERC Stg2021, GA:101040383; PRIN project prot.2017RHX2E4 “At the forefront of Analytical ChemisTry: disrUptive detection technoLogies to improve food safety—ACTUaL”; IDF SHARID (ARS01_01270); Åbo Akademi University CoE “Bioelectronic activation of cell functions”; University of Galway College of Science and Engineering Scholarship and CSGI are acknowledged for partial financial support.

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