title: Effect of surface parameters on the performance of IgG-arrayed hydrogel chips: a comprehensive study.
abstract: In this article, the assay performance of 3D polyurethane (PU) hydrogel surfaces, used either plain or modified with cross linkers and additives in a direct immunoassay for IgG, is correlated with chip surface parameters such as water content and expansion, mechanical stability, hydrophilicity, thickness, and surface topography. Commercial chip surfaces ARChip Epoxy, Nexterion slide H and HydroGel are used as references. A strong correlation between assay sensitivity and physical surface parameters was found only for various hydrogels of the same chemical composition, in which cases assay sensitivity increases with decreasing hydrogel concentration as well as decreasing roughness, water content, and expansion. However, as is the case with all hydrogels tested, more hydrophobic layers with low water content are more highly reproducible from one measurement to another.
authors.affiliation: Austrian Research Centers GmbH - ARC, Department of Bioresources, 2444 Seibersdorf, Austria.
authors.forename: Katarzyna
authors.initials: K
authors.lastname: Derwinska
authors.forename: Levi A
authors.initials: LA
authors.lastname: Gheber
authors.forename: Ursula
authors.initials: U
authors.lastname: Sauer
authors.forename: Leopold
authors.initials: L
authors.lastname: Schorn
authors.forename: Claudia
authors.initials: C
authors.lastname: Preininger
mesh_terms: D020100:Hydrogels; D007118:Immunoassay; D007074:Immunoglobulin G / Q000737:chemistry*; D013050:Spectrometry, Fluorescence; D013499:Surface Properties