Optimisation of glass surfaces for optical immunosensors |
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Authors: | Akkoyun A Bilitewski U |
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Institution: | Gesellschaft für Biotechnologische Forschung mb H, Div. Biochemical Engineering, Mascheroder Weg 1, D-38124, Braunschweig, Germany. akkoyun@gmx.de |
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Abstract: | The surfaces of glass sensor chips were modified with dextran to generate a layer protecting the sensor surface from unspecific protein binding and also serving as a matrix for covalent protein immobilisation. Dextran was coupled to the glass surface in different concentrations either covalently on amino-functionalised glass chips or via biotin-avidin binding. Unspecific binding of BSA was monitored with the grating coupler system, and was increasingly suppressed with increasing dextran concentrations. Using a solution with 100 mg/ml carboxymethylated dextran decreased the signals to approximately 2% of those obtained at an untreated glass chip. Antibodies were successfully immobilised in the dextran and binding to the corresponding Cy5-labelled antigen was repeatedly monitored using a fluorescence sensor system (total internal reflection fluorescence (TIRF)). |
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