Journal
BIOSENSORS & BIOELECTRONICS
Volume 24, Issue 4, Pages 729-735Publisher
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2008.06.057
Keywords
Biosensor; Impedance; Interdigitated electrode array; Immunosensor; DNA hybridization; Glucose oxidase
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Funding
- Spanish Ministry of Science and Technology [AGL2005-07700-C06]
- EC, Food, Agriculture and Fisheries and Biotechnology [211326]
- CSIC, Barcelona, Spain
- Ministry of Education and Culture of Spain
- Council of Scientific Research (CSIC)
- Departament d'Universitats, Recerca i Societat de la Informacio la Generalitat de Catalunya [2005SGR 00207]
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A new transducer for biosensor applications has been developed based on a three-dimensional interdigitated electrode array (IDEA) with electrode digits separated by an insulating barrier. Binding of molecules to a chemically modified surface of the transducer induces important changes in conductivity between the electrodes. Three-dimensional sensor shows considerable improvement compared with a standard planar IDEA design. The potential of the developed device as a sensor transducer to detect immunochemical and enzymatic reactions, as well as DNA hybridization events is demonstrated. The immunosensor allows direct detection of the antibiotic sulfapyridine and shows the IC50 parameter value of 5.6 mu g L-1 in a buffer. Immunochemical determination occurs under competitive configurations and without the use of any label. Each modified sensor is of a single use. Nevertheless, biochemical reagents can be easily cleaned off the sensor surface for its reuse. Layer-by-layer method of used to deposit polyethyleneimine and glucose oxidase showed that the sensor is also highly effective for detecting single and multilayered molecular assemblies. (C) 2008 Elsevier B.V. All rights reserved.
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