Journal
COLLOIDS AND SURFACES B-BIOINTERFACES
Volume 68, Issue 2, Pages 193-199Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.colsurfb.2008.10.001
Keywords
Immunoassay; Heterogeneous binding; Surface plasmon resonance; Antibody Fab '-fragment; Immobilisation
Funding
- Technical Research Centre of Finland
- EU [FP6-016467]
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Antibody Fab'-fragments have been immobilised on hydrophilic gold by direct self-assembly, and embedded in a matrix of non-ionic hydrophilic polymers, tris(hydroxymethyl)methylacrylamide, carrying lipoate terminal linking groups. Different polymers were synthesised, and co-adsorbed or post-adsorbed between the antibody fragments in order to optimise the antigen binding. Various factors were investigated that influence the activity of the immobilised Fab'-fragments for binding of the antigen, human IgG. The Fab'-fragments were immobilised in dense layers close to monolayer coverage, and the stoichiometric efficiency of immobilisation was up to 30%, with the human IgG also approaching monolayer coverage. The cleaning of the gold surface was a crucial factor in preservation of activity. Besides the usual treatment in hot ammonia/peroxide Solution, hot DMSO appeared to be highly effective as a cleaning agent. (C) 2008 Elsevier B.V. All rights reserved.
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