Electrical readout of protein microarrays on regular glass slides
Bonilla, Diana and Mallen, Maria and De La Rica, Roberto and Fernandez-Sanchez, Cesar and Baldi, Antoni (2011) Electrical readout of protein microarrays on regular glass slides. Analytical Chemistry, 83 (5). 1726–1731. ISSN 0003-2700 (https://doi.org/10.1021/ac102938z)
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A new approach for the electrical readout of microarrays prepared on regular glass slides, using an array of impedimetric transducers (interdigitated electrodes, IDEs) is presented in this work. Impedance detection relies on the use of a urease-labeled immunoassay scheme. Urease is able to produce an increase in conductivity by hydrolysis of the urea substrate, which is measured with the IDEs and directly related to the amount of target analyte. Unlike previous electrical microarrays, the assay does not take place on top of the transducers but on a regular glass slide, which may enable the development of compact multiplexed analytical systems with lower cost per assay. A droplet of solution with the enzymatic substrate is deposited on each transducer of the array, and the microarray is positioned at a short distance (300 μm) so that each droplet wets one transducer and one spot of the microarray. This procedure allows reusing the transducer array for readout of a virtually unlimited number of microarrays. A microarray based on an immunoassay for the detection of a mouse generic protein in a concentration range from 0.03 to 30 μg mL−1 was carried out to assess the performance of the electrical readout approach. A sigmoid response with a limit of detection of 0.1 μg mL−1 and a dynamic range of 1 order of magnitude was obtained. A comparative study was also carried out with two well established analytical procedures. First, the urease-based immunoassay was tested in a 96 well microtiter plate using phenol red pH indicator and absorbance detection. Second, the microarray was carried out using the same target protein concentration range but applying a Cy3 label and fluorescence detection. Both assays allowed for the validation of the performance of the presented electrical readout system.
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Item type: Article ID code: 45686 Dates: DateEvent2011Published2 February 2011Published OnlineSubjects: Science > Physics Department: Faculty of Science > Physics Depositing user: Pure Administrator Date deposited: 06 Nov 2013 11:19 Last modified: 11 Nov 2024 10:32 URI: https://strathprints.strath.ac.uk/id/eprint/45686