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Novell M.,Rovira i Virgili University | Guinovart T.,Rovira i Virgili University | Steinberg I.M.,University of Zagreb | Steinberg M.,GoSense Wireless Ltd | And 2 more authors.
Analyst | Year: 2013

Instrumental approaches to remotely and wirelessly monitoring chemical species are increasingly needed. Together with the electronic developments, efforts to optimize and validate the performance of these new devices are required. In this work, the analytical performance of a recently developed potentiometer-radiofrequency tag connected to ion-selective electrodes is evaluated. This credit card sized and extremely low power consumption device yield results that are comparable to those obtained with more sophisticated, lab-based tools. Advantages such as portability and autonomy, together with unique features, such as the ability to be read through the walls in a closed vessel are demonstrated. Future perspectives opened by this new generation of devices, such as their use in wearable devices and in decentralized settings are discussed. © 2013 The Royal Society of Chemistry. Source


Steinberg M.D.,GoSense Wireless Ltd | Kassal P.,University of Zagreb | Steinberg I.M.,University of Zagreb
Electroanalysis | Year: 2016

This review is an analysis of system architectures in wearable electrochemical sensors. It presents the academic research output from journal articles, conference proceedings and books from 2006 up to early 2016. The review is structured into three sections that investigate architectures for (i) electrochemical sensors as wearable accessories, (ii) electrochemical sensors integrated into clothing and textiles, and (iii) electrochemical sensors that are applied to the body. The results indicate that novel architectures and materials are in research for sampling, measurement and fabrication of wearable sensors but that novel energy sources and readout techniques are under-utilised. A trend is evident in greater compatibility with mobile products such as Smartphones. The “user-centric” approach to wearable electrochemical sensor research is producing highly-integrated system architectures. A selection of exemplary wearables from the literature are presented. © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim Source


Kassal P.,University of California at San Diego | Kassal P.,University of Zagreb | Kim J.,University of California at San Diego | Kumar R.,University of California at San Diego | And 5 more authors.
Electrochemistry Communications | Year: 2014

Advanced wound care technologies need to evolve in response to the growing burden of chronic wounds on national healthcare budgets and the debilitating impact chronic wounds have on patient quality of life. We describe here a new type of smart bandage for determination of uric acid (UA) status, a key wound biomarker, formed by screen printing an amperometric biosensor directly on a wound dressing. Immobilized uricase, paired with a printed catalytic Prussian blue transducer, facilitates chronoamperometric detection of uric acid at a low working potential. The smart bandage biosensor interfaces with a custom designed wearable potentiostat that provides on-demand wireless data transfer of UA status to a computer, tablet, or Smartphone by radio frequency identification (RFID) or near-field communication (NFC). The analytical performance of the smart bandage - sensitivity, selectivity, operational stability, and mechanical robustness - is described. Application of these bandages will provide insight into wound status and may reduce the frequency at which dressings are changed, allowing for healthcare cost savings and a reduction in patient stress and pain. © 2015 Elsevier B.V. Source


Steinberg M.D.,GoSense Wireless Ltd | Kassal P.,University of Zagreb | Tkalcec B.,University of Zagreb | Murkovic Steinberg I.,University of Zagreb
Talanta | Year: 2014

A novel miniaturised photometer has been developed as an ultra-portable and mobile analytical chemical instrument. The low-cost photometer presents a paradigm shift in mobile chemical sensor instrumentation because it is built around a contactless smart card format. The photometer tag is based on the radio-frequency identification (RFID) smart card system, which provides short-range wireless data and power transfer between the photometer and a proximal reader, and which allows the reader to also energise the photometer by near field electromagnetic induction. RFID is set to become a key enabling technology of the Internet-of-Things (IoT), hence devices such as the photometer described here will enable numerous mobile, wearable and vanguard chemical sensing applications in the emerging connected world. In the work presented here, we demonstrate the characterisation of a low-power RFID wireless sensor tag with an LED/photodiode-based photometric input. The performance of the wireless photometer has been tested through two different model analytical applications. The first is photometry in solution, where colour intensity as a function of dye concentration was measured. The second is an ion-selective optode system in which potassium ion concentrations were determined by using previously well characterised bulk optode membranes. The analytical performance of the wireless photometer smart tag is clearly demonstrated by these optical absorption-based analytical experiments, with excellent data agreement to a reference laboratory instrument. © 2013 Elsevier B.V. Source


Steinberg M.D.,GoSense Wireless Ltd | Tkalcec B.,University of Zagreb | Steinberg I.M.,University of Zagreb
Sensors and Actuators, B: Chemical | Year: 2016

A passive contactless sensor is presented for monitoring resistivity in porous materials. Electrical resistivity (ER) is an important indicator of water and ion content in porous materials, especially man-made and natural composites such as concrete and soil. The ER sensor is small, battery-free and is energised and queried wirelessly for data by a radio-frequency identification (RFID) reader or a near-field communication (NFC) enabled mobile device (a tablet or Smartphone). By applying Topsøe coefficients and a calibration function to the sensor output, the ER of the material is reliably estimated. Experimental results in the laboratory with a model aggregate material (sand) wetted with sodium chloride solutions demonstrate excellent agreement between the new sensor and a standard laboratory conductivity meter. Embedded ER sensors can provide long-term and repeatable data from soil, concrete and similar porous materials where ER is an accepted proxy for water and ion content. We think that passive contactless resistivity sensors will become commonplace as the Internet of Things (IoT) develops in the construction and precision agriculture sectors, and as the demand for long-lived, battery-free sensors increases. © 2016 Elsevier B.V. All rights reserved. Source

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