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Photography by Cameras Integrated in Smartphones as a Tool for Analytical Chemistry Represented by an Butyrylcholinesterase Activity Assay

Faculty of Military Health Sciences, University of Defense, Trebesska 1575, Hradec Kralove CZ-50001, Czech Republic
Academic Editor: Alexander Star
Sensors 2015, 15(6), 13752-13762; https://doi.org/10.3390/s150613752
Received: 17 April 2015 / Revised: 31 May 2015 / Accepted: 5 June 2015 / Published: 11 June 2015
(This article belongs to the Section Biosensors)
Smartphones are popular devices frequently equipped with sensitive sensors and great computational ability. Despite the widespread availability of smartphones, practical uses in analytical chemistry are limited, though some papers have proposed promising applications. In the present paper, a smartphone is used as a tool for the determination of cholinesterasemia i.e., the determination of a biochemical marker butyrylcholinesterase (BChE). The work should demonstrate suitability of a smartphone-integrated camera for analytical purposes. Paper strips soaked with indoxylacetate were used for the determination of BChE activity, while the standard Ellman’s assay was used as a reference measurement. In the smartphone-based assay, BChE converted indoxylacetate to indigo blue and coloration was photographed using the phone’s integrated camera. A RGB color model was analyzed and color values for the individual color channels were determined. The assay was verified using plasma samples and samples containing pure BChE, and validated using Ellmans’s assay. The smartphone assay was proved to be reliable and applicable for routine diagnoses where BChE serves as a marker (liver function tests; some poisonings, etc.). It can be concluded that the assay is expected to be of practical applicability because of the results’ relevance. View Full-Text
Keywords: photography; imagination; colorimetry; digital photography; mobile phone; RGB; CMYK; photometry; diagnosis; acetylcholinesterase; butyrylcholinesterase; naked eye detection photography; imagination; colorimetry; digital photography; mobile phone; RGB; CMYK; photometry; diagnosis; acetylcholinesterase; butyrylcholinesterase; naked eye detection
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Pohanka, M. Photography by Cameras Integrated in Smartphones as a Tool for Analytical Chemistry Represented by an Butyrylcholinesterase Activity Assay. Sensors 2015, 15, 13752-13762.

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