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A novel enzyme entrapment in SU-8 microfabricated films for glucose micro-biosensors

Psoma, Sotiria D.; van der Wal, Peter D.; Frey, Olivier; de Rooij, Nicolaas F. and Turner, Anthony P.F. (2010). A novel enzyme entrapment in SU-8 microfabricated films for glucose micro-biosensors. Biosensors and Bioelectronics, 26(4) pp. 1582–1587.

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The present work investigates the utilisation of the widely used SU-8 photoresist as an immobilisation matrix for glucose oxidase (GOx) for the development of glucose micro-biosensors. The strong advantage of the proposed approach is the simultaneous enzyme entrapment during the microfabrication process with in a single step, which is of high importance for the simplification of the BioMEMS procedures. Successful encapsulation of the enzyme GOx in“ customised” SU-8 microfabricated structures was achieved through optimisation of the one-step microfabrication process. Although the process involved contact with organic solvents, UV-light exposure, heating for pre- and post-bake and enzyme entrapment in a hard and rigid epoxy resin matrix, the enzyme retained its activity after encapsulation in SU-8. Measurements of the immobilised enzyme’s activity inside the SU-8 matrix were carried out using amperometric detection of hydrogen peroxide in a 3-electrode setup. Films without enzyme showed negligible variation in current upon the addition of glucose, as opposed to films with encapsulated enzyme which showed a very clear increase in current. Experiments using films of increased thickness or enzyme concentration, showed a higher response, thus proving that the enzyme remained active not only on the film’s surface, but also inside the matrix as well. The proposed enzyme immobilisation in SU-8 films opens up new possibilities for combining BioMEMS with biosensors and organic electronics.

Item Type: Journal Item
Copyright Holders: 2010 Elsevier
ISSN: 0956-5663
Keywords: SU-8 films; biosensor; microfabrication; immobilisation; glucose oxidase entrapment; BioMEMS
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Engineering and Innovation
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Research Group: Smart Materials
Item ID: 59563
Depositing User: Sotiria Psoma
Date Deposited: 08 Mar 2019 14:44
Last Modified: 01 Apr 2019 17:40
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