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Wireless Fluorimeter for Mobile and Low Cost Chemical Sensing: A Paper Based Chloride Assay

Kassal, Petar; Steinberg, Matthew D.; Horak, Ema; Murkovic Steinberg, Ivana (2018) Wireless Fluorimeter for Mobile and Low Cost Chemical Sensing: A Paper Based Chloride Assay. Sensors and Actuators B: Chemical, 275 . pp. 230-236. ISSN 0925-4005

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Wireless chemical sensors are increasingly finding use as analytical devices in healthcare diagnostics, wearable sensing (sweat analysis) and in the rapidly emerging area of the Sensor Internet of Things (SIoT). In such wireless scenarios, the application of fluorescence-based sensors is lagging behind other types of transduction mechanisms. In this work a new low- cost and highly portable wireless fluorimeter for optical chemical fluorescence intensity measurements is presented (bill-of-materials approximately €20). The fluorimeter is programmed and communicates wirelessly with mobile devices or personal computers by radio-frequency identification (RFID) or near-field communication (NFC). This novel mobile analytical system is highly adaptable for use with different fluorescent sensor chemistries and analytes. The fluorimeter has been evaluated in the laboratory in two sets of proof-of-concept experiments: firstly fluorimetry in solution, where the fluorescence intensities of fluorescein were recorded, and secondly chloride sensing via a paper-immobilised quinine sulphate fluorescent indicator. The latter represents the first demonstration of wireless (radio-frequency) fluorescence-based chloride sensing. Satisfactory analytical performance was achieved in the entire range of sweat chloride concentrations. The wireless fluorimeter system presented here could make a significant contribution to several emerging areas of mobile chemical sensor research, including wearable sensors for healthcare and sport, mobile point-of-sample diagnostics as well as more generally for the Sensor Internet of Things.

Item Type: Article
Additional Information: These materials are based on work supported by the University of Zagreb, under research grant number 110011 (2013), 'Integrated analytical chemical systems: development and application of chemical sensors and biosensors.' The authors would like to thank Mario Popovic of Dok-Ing d.o.o. for the 3D printing of the ABS optoelectronic probe holder.
Uncontrolled Keywords: Wireless chemical sensor ; Fluorescent sensor ; Radio-frequency identification ; Paper-based sensor ; Chloride sensor ; Wearable sensor
Subjects: NATURAL SCIENCES > Chemistry
Divisions: Division of Organic Chemistry and Biochemistry
Depositing User: Ema Horak
Date Deposited: 29 Nov 2019 11:15
DOI: 10.1016/j.snb.2018.07.170

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