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Ink-jettable paper-based sensor for charged macromolecules and surfactants
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface and Corrosion Science.
2014 (English)In: Sensors and actuators. B, Chemical, ISSN 0925-4005, Vol. 195, 389-395 p.Article in journal (Refereed) Published
Abstract [en]

The use of metachromatic dye-based formulations for the preparation of inkjettable prototype indicators suitable for the detection of charged macromolecules, surfactants or other low molecular weight molecules was investigated. Such indicators were based on the use of metachromatic o-toluidine blue (OTB) that undergoes a characteristic change in color (from blue to pink) upon interaction with anionic macromolecules. When applied onto absorbing substrates such as paper and paperboard, solutions containing OTB and the same dye in the presence of potassium polyvinyl sulfate (KPVS), proved to indicate negatively charged polymers and cationic surfactants. The colorimetric responses suggest a detection limit and sensitivity both are in the order of 1 mM of charged species but can be further improved. Interactions between active species in the indicators and some of the additives in inkjettable formulations (surfactant and humectants) interfered with the mechanism by which an OTB/KVPS-based system work only to a minor degree and could be overcome by priming the substrate. An OTB-based system was formulated into an inkjettable formulation that, once applied to a substrate, was showed to indicate charged polymers and surfactants. This concept has the potential for sensing/indication of other charged macromolecules, such as carboxylates and polyphosphates, which are relevant in biomedical (e.g. fouling due to microbial activity), packaging applications (e.g. migration or release of compounds, food spoilage), microfluidic devices or a simple dipstick application to indicate the presence of charged components.

Place, publisher, year, edition, pages
2014. Vol. 195, 389-395 p.
Keyword [en]
Dipstick, Inkjet printing, Metachromatic dye, Polyelectrolyte, Sensor, Surfactant
National Category
Other Chemistry Topics
URN: urn:nbn:se:kth:diva-142306DOI: 10.1016/j.snb.2014.01.064ISI: 000332417600052ScopusID: 2-s2.0-84893970244OAI: diva2:703161
VinnovaSwedish Foundation for Strategic Research Knowledge Foundation

QC 20140305

Available from: 2014-03-05 Created: 2014-02-28 Last updated: 2014-04-14Bibliographically approved

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