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Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/17784

Self-assembled monolayers as a base for immunofunctionalisation: unequal performance for protein and bacteria detection

AutorBaldrich, Eva; Laczka, Olivier; Campo García, Francisco Javier del; Muñoz Pascual, Francisco Javier
Palabras claveSurface immunofunctionalisation
Self-assembled monolayer
Antibody conjugation
Bacteria detection
Fecha de publicación7-feb-2008
CitaciónAnalytical and Bioanalytical Chemistry 390(6): 1557-1562 (2008)
ResumenBiosensor development strongly depends on the optimisation of surface functionalisation strategies. When gold surfaces are considered, immunofunctionalisation by modification of self-assembled monolayers (SAMs) is one of the preferred approaches. In this respect, SAM-based antibody (Ab) incorporation has shown better performance than Ab physisorption for the detection of proteins and small targets. Reports on bacteria detection are less frequent. In this work, we assess the performance of various SAM-based gold immunofunctionalisation strategies, currently applied to protein detection, in the field of bacteria determination. We present the results for Ab chemical conjugation on mercaptopropanoic acid and mercaptoundecanoic acid SAMs, as well as on a dextranized cysteamine SAM. All the modified surfaces studied were shown to be appropriate for the direct detection of an enzyme-labelled protein, but none succeeded in detecting a bacterial target in a sandwich assay format. Conversely, gold functionalised by Ab physisorption allowed E. coli detection when a sandwich enzyme-linked assay was carried out. The implications of bacteria size and wall complexity are discussed. These results indicate that immunofunctionalisation strategies appropriate for protein detection are not necessarily transferable to work with more complex targets such as bacteria. In this respect, Ab physisorption appears to be a suitable alternative to SAM-based gold functionalisation for bacteria detection.
Descripción6 pages, 3 figures.-- PMID: 18256810 [PubMed].-- Printed version published Mar 2008.
Versión del editorhttp://dx.doi.org/10.1007/s00216-008-1887-1
ISSN1618-2642 (Print)
1618-2650 (Online)
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