Abstract
Biofunctional coatings are key elements of biosensors regulating interactions between the sensing surface and analytes as well as matrix components of the sample. These coatings can improve sensing capabilities both by amplifying the target signal and attenuating interfering signals originating from surface fouling (non-specific binding). Considering the tested materials so far, hydrogel-based layers have been verified to be among the most effective layers in improving biochip performance. The polysaccharide dextran can be efficiently used to form hydrogel layers displaying extended three-dimensional structure on biosensor surfaces. Owing to their high water content and flexible structure, dextran coatings present advanced antifouling abilities, which can be exploited in classic bioanalytical measurements as well as in the development of cell-on-a-chip type biosensors. However, in spite of the numerous applications, the deep characterization of dextran layers has been missing from the literature. This phenomenon can be attributed to the challenging analysis of few nanometer-thick layers with high water content. The lack of available data is more pronounced regarding the layer behaviors under aqueous conditions. In this chapter we present various surface analytical methods (including biosensor-type techniques) suitable for the complex characterization of hydrogel coatings whose thickness ranges from few to several ten nanometers. As a case study, we focus on the analysis of carboxymethyl dextran (CMD) layers developed for waveguide-based label-free optical biosensor applications. Examination methodologies both under dry and aqueous conditions as well as testing of antifouling abilities are also presented.
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Notes
- 1.
This principle is analogous to the measurement principle of evanescent field applying sensors, where a standing electromagnetic field over the waveguide layer is generated allowing to sense analytes.
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Acknowledgments
This study was funded by the Momentum (“Lendület”) Program of the Hungarian Academy of Sciences, the National Research, Development and Innovation Office (NKFIH) [ERC_HU, KKP_19, KH and FK-128901 Programs] and János Bolyai Research Scholarship of the Hungarian Academy of Sciences are also gratefully acknowledged.
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Saftics, A. et al. (2020). Dextran-based Hydrogel Layers for Biosensors. In: Chandra, P., Prakash, R. (eds) Nanobiomaterial Engineering. Springer, Singapore. https://doi.org/10.1007/978-981-32-9840-8_8
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