Maleic anhydride and acetylene plasma copolymer surfaces for SPR immunosensing
We report on the successful application of carboxyl-rich plasma polymerized (PP) films as a matrix layer for bioreceptor immobilization in surface plasmon resonance (SPR) immunosensing. Composition and chemical properties of the carboxyl-rich PP films deposited from a mixture of maleic anhydride and acetylene were investigated. Changes in the films stored in air, water, and buffer were studied and the involved chemical changes were described. Performance in SPR immunosensing was evaluated on interactions of human serum albumin (HSA) with a specific monoclonal antibody. The comparison with the mixed self-assembled monolayer of mercaptoundecanoic acid and mercaptohexanol (MUA/MCH) and one of the most widely used surfaces for SPR, the 2D and 3D carboxymethylated dextran (CMD), was presented to show the efficacy of plasma polymerized matrix layers for biosensing. The PP film-based SPR immunosensor provided a similar detection limit of HSA (100 ng/mL) as MUA/MCH- (100 ng/mL) and 3D CMD (50 ng/mL)-based sensors. However, the response levels were about twice higher in case of the PP film-based immunosensor than in case of MUA/MCH-based alternative. The PP film surfaces had similar binding capacity towards antibody as the 3D CMD layers. The response of PP film-based sensor towards HSA was comparable to 3D CMD-based sensor up to 2.5 μg/mL. For the higher concentrations (> 10 μg/mL), the response of PP film-based immunosensor was lower due to inaccessibility of active sites of the immobilized antibody inside the flat PP film surface. We have demonstrated that due to its high stability and cost-effective straightforward preparation, the carboxyl-rich PP films represent an efficient alternative to self-assembled monolayers (SAM) and dextran-based layers in label-free immunosensing.
KeywordsPlasma polymerization Carboxyl-rich films Immobilization Surface plasmon resonance biosensor Label-free detection
This research has been financially supported by the Ministry of Education, Youth and Sports of the Czech Republic under the project CEITEC 2020 (LQ1601). CIISB research infrastructure project LM2015043, funded by Ministry of Education, Youth and Sports of the Czech Republic, is gratefully acknowledged for financial support of the measurements at CF Nanobiotechnology.
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Conflict of interest
The authors declare that they have no conflict of interest.
- 16.Batan A, Nisol B, Kakaroglou A, De Graeve I, Van Assche G, Van Mele B, et al. The impact of double bonds in the APPECVD of acrylate-like precursors. Plasma Process Polym. 2013;10(10):857–63.Google Scholar
- 25.Makhneva E, Obrusník A, Farka Z, Skládal P, Vandenbossche M, Hegemann D, et al. Carboxyl-rich plasma polymer surfaces in surface plasmon resonance immunosensing. Jpn J Appl Phys. 2018;57(1):5.Google Scholar
- 27.Coates J. Interpretation of infrared spectra, a practical approach. Encyclopedia of analytical chemistry. 2006.Google Scholar
- 33.Farka Z, Kovář D, Přibyl J, Skládal P. Piezoelectric and surface plasmon resonance biosensors for Bacillus atrophaeus spores. Int J Electrochem Sci. 2013;8(1):100–12.Google Scholar
- 34.Lofas S, Johnsson B. A novel hydrogel matrix on gold surfaces in surface-plasmon resonance sensors for fast and efficient covalent immobilization of ligands. J Chem Soc Chem Commun. 1990;(21):1526–8.Google Scholar