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Signal Enhancement in Ligand-Receptor Interactions using Dynamic Polymers at Quartz Crystal Microbalance Surfaces
Department of Chemistry, KTH.
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Fasta tillståndets elektronik. Attana AB. (Thin Films Group)
Attana AB.
Attana AB.
Vise andre og tillknytning
2016 (engelsk)Inngår i: The Analyst, ISSN 0003-2654, E-ISSN 1364-5528, Vol. 141, nr 13, s. 3993-3996Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The potential for signal amplification on QCM sensors by use of in situ polymerized poly(acrylic acid) brushes has been studied. A biotin derivative was immobilized on these surfaces and the interaction with anti-biotin Fabs was evaluated. Interaction data was found to be specific for the studied binding events, and the level of non-specific binding was shown to be low. The surface was proven to be suitable for regeneration, of importance for biomolecular interaction analysis and repetitive immunoassays.

For comparison, the same interaction system was tested using commercial sensor surfaces with carboxylated self-assembled monolayers. The poly(acrylic acid) surface showed a dramatic increase in signal response with more than ten times the signal of the carboxylated self-assembled monolayer surface. Thus, the present study shows that polymers can be successfully applied to amplify responses on QCM sensors, valuable for studies of interactions between receptors and low molecular weight compounds.

sted, utgiver, år, opplag, sider
2016. Vol. 141, nr 13, s. 3993-3996
Emneord [en]
dynamic chemistry, quartz crystal microbalance, iniferter, photopolymerization, biosensor, interaction
HSV kategori
Forskningsprogram
Ytbioteknik
Identifikatorer
URN: urn:nbn:se:uu:diva-107252DOI: 10.1039/c6an00735jISI: 000378942300006PubMedID: 27196531OAI: oai:DiVA.org:uu-107252DiVA, id: diva2:228401
Forskningsfinansiär
Swedish Research CouncilTilgjengelig fra: 2009-07-30 Laget: 2009-07-30 Sist oppdatert: 2017-12-13bibliografisk kontrollert
Inngår i avhandling
1. Development of Electroacoustic Sensors for Biomolecular Interaction Analysis
Åpne denne publikasjonen i ny fane eller vindu >>Development of Electroacoustic Sensors for Biomolecular Interaction Analysis
2009 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

Biomolecular interaction analysis to determine the kinetics and affinity between interacting partners is important for the fundamental understanding of biology, as well as for the development of new pharmaceutical substances. A quartz crystal microbalance instrument suitable for kinetics and affinity analyses of interaction events was developed. The functionality of the sensor system was demonstrated by development of an assay for relative affinity determination of lectin-carbohydrate interactions.

Sensor surfaces allowing for effective immobilization of one interacting partner is a key functionality of a biosensor. Here, three different surfaces and immobilization methods were studied. First, optimized preparation conditions for sensor surfaces based on carboxyl-terminated self assembled monolayers were developed and were demonstrated to provide highly functional biosensor surfaces with low non-specific binding. Second, a method allowing for immobilization of very acidic biomolecules based on the use of an electric field was developed and evaluated. The electric field made it possible to immobilize the highly acidic C-peptide on a carboxylated surface. Third, a method for antibody immobilization on a carboxyl surface was optimized and the influence of immobilization pH on the immobilization level and antigen binding capacity was thoroughly assessed. The method showed high reproducibility for a set of antibodies and allowed for antibody immobilization also at low pH.

Three broadly different strategies to increase the sensitivity of electroacoustic sensors were explored. A QCM sensor with small resonator electrodes and reduced flow cell dimensions was demonstrated to improve the mass transport rate to the sensor surface. The use of polymers on QCM sensor surfaces to enhance the sensor response was shown to increase the response of an antibody-antigen model system more than ten-fold. Moreover, the application of high frequency thin film bulk acoustic resonators for biosensing was evaluated with respect to sensing range from the surface. The linear detection range of the thin film resonator was determined to be more than sufficient for biosensor applications involving, for instance, antibody-antigen interactions. Finally, a setup for combined frequency and resistance measurements was developed and was found to provide time resolved data suitable for kinetics determination.

sted, utgiver, år, opplag, sider
Uppsala: Acta Universitatis Upsaliensis, 2009. s. 68
Serie
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 658
Emneord
biosensor, protein interactions, kinetics, affinity, QCM, quartz crystal microbalance, piezoelectric resonators, dissipation, motional resistance
HSV kategori
Forskningsprogram
Teknisk fysik med inriktning mot mikrosystemteknik
Identifikatorer
urn:nbn:se:uu:diva-107211 (URN)978-91-554-7572-7 (ISBN)
Disputas
2009-09-11, Å80101, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 09:30 (engelsk)
Opponent
Veileder
Prosjekter
wisenet
Tilgjengelig fra: 2009-08-20 Laget: 2009-07-29 Sist oppdatert: 2014-11-25bibliografisk kontrollert

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