Ion-Exchange Based Immobilization of Chromogenic Reagents on Microfluidic Paper Analytical Devices

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dc.contributor.authorRahbar, Mohammadcs
dc.contributor.authorWheeler, Aaron R.cs
dc.contributor.authorPaull, Brettcs
dc.contributor.authorMacka, Miroslavcs
dc.coverage.issue14cs
dc.coverage.volume91cs
dc.date.accessioned2020-08-04T11:03:45Z
dc.date.available2020-08-04T11:03:45Z
dc.date.issued2019-07-16cs
dc.description.abstractDistance-based detection methods, as used in development of microfluidic paper analytical devices (mu PADs), rely on the dynamic formation of a colored band along the length of the paper microfluidic channels. The color change is driven by the reaction of chromogenic reagents (typically water-insoluble) that are bound to the paper, thus not subject to being washed away by the sample flow along the detection channel. Here, we introduce the use of an anion-exchange filter paper (as a replacement for standard, unmodified filter paper) for distance-based detection in mu PADs, in order to immobilize the water-soluble anionic reagents upon the paper detection channels based on ion-exchange interactions of the oppositely charged paper (protonated tertiary amine groups) and the anionic groups of the reagents. The ion-exchange (IE) paper was initially characterized and its properties were compared with standard cellulose paper. The IE paper was shown to be capable of strong retention of anionic reagents exhibiting acidic functional groups (carboxylic, sulfonic), which become deprotonated and negatively charged when in contact with the IE paper. The effect of the ionic strength (10-250 mM Cl-) and pH (1-13) on the immobilization of the investigated reagents were also determined. The IE-mu PADs were then modified with anionic chromogenic reagents and applied to distance-based determination of total calcium (LOD = 0.03 mM) and total acidity (LOD = 2.5 mM) content in serum and wine samples, respectively. The detailed mechanisms of the developed assays on the IE paper are also discussed. We propose that IE-mu PADs represent a useful new addition to the distance-based detection toolbox and considerably enhance the applicability of such a detection method.en
dc.formattextcs
dc.format.extent8756-8761cs
dc.format.mimetypeapplication/pdfcs
dc.identifier.citationANALYTICAL CHEMISTRY. 2019, vol. 91, issue 14, p. 8756-8761.en
dc.identifier.doi10.1021/acs.analchem.9b01288cs
dc.identifier.issn0003-2700cs
dc.identifier.other158054cs
dc.identifier.urihttp://hdl.handle.net/11012/180576
dc.language.isoencs
dc.publisherAmerican Chemical Societycs
dc.relation.ispartofANALYTICAL CHEMISTRYcs
dc.relation.urihttps://pubs.acs.org/doi/10.1021/acs.analchem.9b01288cs
dc.rights(C) American Chemical Societycs
dc.rights.accessopenAccesscs
dc.rights.sherpahttp://www.sherpa.ac.uk/romeo/issn/0003-2700/cs
dc.subjection-exchange interactionen
dc.subjectmicrofluidic paper analytical devices (mu PADs)en
dc.titleIon-Exchange Based Immobilization of Chromogenic Reagents on Microfluidic Paper Analytical Devicesen
dc.type.driverarticleen
dc.type.statusPeer-revieweden
dc.type.versionpublishedVersionen
sync.item.dbidVAV-158054en
sync.item.dbtypeVAVen
sync.item.insts2020.08.04 13:03:45en
sync.item.modts2020.08.04 12:25:06en
thesis.grantorVysoké učení technické v Brně. Středoevropský technologický institut VUT. Chytré nanonástrojecs
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