Peptoid microsphere coatings to improve performance in sandwich ELISA microarrays

Document Type

Article

Publication Date

4-23-2021

Keywords

Peptoid, ELISA, Microarray, Microspheres

Abstract

Enzyme-linked immunosorbent assay (ELISA) microarray performance is limited by low assay sensitivity and dynamic range. Increasing the surface area for reagent binding can help to improve performance, but standard techniques such as roughening the surface or adding a polymer coating lead to increased non-specific fluorescence and do not have reproducibly improved performance. Another approach to increase surface area is adding a microsphere coating on the surface. Poly-N-substituted glycine (peptoid) microspheres are ideal for this application due to low immunogenicity, protease-resistance, and biocompatibility. Peptoids are polymers with a backbone similar to peptides, but with the side chains appended to nitrogen rather than the alpha carbon. A variety of side chain chemistries can be incorporated into peptoids through a solid-phase, sequence-specific synthesis protocol. Here we report the development of sandwich ELISA microarray on peptoid microsphere coated glass slides. Coating morphology was evaluated via SEM and efficacy was assessed by ELISA microarray performance. Peptoid microsphere coated glass slides exhibit an increase in signal intensity and dynamic range as compared to commercially available microarray slides. These studies show the potential for peptoid microspheres as coatings for ELISA microarray slides, as well as for use in other biosensor applications.

Comments

This article was published with support from the Open Access Publishing Fund administered through the University of Arkansas Libraries.

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