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Biosensors 2019, 9(1), 7; https://doi.org/10.3390/bios9010007

Characterization and Inkjet Printing of an RNA Aptamer for Paper-Based Biosensing of Ciprofloxacin

1
Department of Biology, Technische Universität Darmstadt, 64287 Darmstadt, Germany
2
Institute for Printing Science and Technology, Technische Universität Darmstadt, 64289 Darmstadt, Germany
*
Authors to whom correspondence should be addressed.
Received: 26 November 2018 / Revised: 24 December 2018 / Accepted: 26 December 2018 / Published: 2 January 2019
(This article belongs to the Special Issue Feature Papers: State-of-the-Art Biosensors Technology 2018)
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Abstract

The excessive use of antibiotics in food-producing animals causes a steady rise of multiple antibiotic resistance in foodborne bacteria. Next to sulfonamides, the most common antibiotics groups are fluoroquinolones, aminoglycosides, and ß-lactams. Therefore, there is a need for a quick, efficient, and low-cost detection procedure for antibiotics. In this study, we propose an inkjet-printed aptamer-based biosensor developed for the detection of the fluoroquinolone ciprofloxacin. Due to their extraordinary high affinity and specificity, aptamers are already widely used in various applications. Here we present a ciprofloxacin-binding RNA aptamer developed by systematic evolution of ligands by exponential enrichment (SELEX). We characterized the secondary structure of the aptamer and determined the KD to 36 nM that allow detection of antibiotic contamination in a relevant range. We demonstrate that RNA aptamers can be inkjet-printed, dried, and resolved while keeping their functionality consistently intact. With this proof of concept, we are paving the way for a potential range of additional aptamer-based, printable biosensors. View Full-Text
Keywords: biosensor; aptamer; ciprofloxacin; detection; printing; fluorescence biosensor; aptamer; ciprofloxacin; detection; printing; fluorescence
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Jaeger, J.; Groher, F.; Stamm, J.; Spiehl, D.; Braun, J.; Dörsam, E.; Suess, B. Characterization and Inkjet Printing of an RNA Aptamer for Paper-Based Biosensing of Ciprofloxacin. Biosensors 2019, 9, 7.

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