- Title
- Critical assessment of the quartz crystal microbalance with dissipation as an analytical tool for biosensor development and fundamental studies
- Creator
- Fogel, Ronen
- Creator
- Mashazi, Philani N
- Creator
- Nyokong, Tebello
- Creator
- Limson, Janice
- Subject
- To be catalogued
- Date Issued
- 2007
- Date
- 2007
- Type
- text
- Type
- article
- Identifier
- http://hdl.handle.net/10962/271204
- Identifier
- vital:54521
- Identifier
- xlink:href="https://doi.org/10.1016/j.bios.2007.03.012"
- Description
- One of the challenges in electrochemical biosensor design is gaining a fundamental knowledge of the processes underlying immobilisation of the molecules onto the electrode surface. This is of particular importance in biocomposite sensors where concerns have arisen as to the nature of the interaction between the biological and synthetic molecules immobilised. We examined the use of the Quartz Crystal Microbalance with Dissipation (QCM-D) as a tool for fundamental analyses of a model sensor constructed by the immobilisation of cobalt(II) phthalocyanine (TCACoPc) and glucose oxidase (GOx) onto a gold-quartz electrode (electrode surface) for the enhanced detection of glucose. The model sensor was constructed in aqueous phase and covalently linked the gold surface to the TCACoPc, and the TCACoPc to the GOx, using the QCM-D. The aqueous metallophthalocyanine (MPc) formed a multi-layer over the surface of the electrode, which could be removed to leave a monolayer with a mass loading that compared favourably to the theoretical value expected. Analysis of frequency and dissipation plots indicated covalent attachment of glucose oxidase onto the metallophthalocyanine layer. The amount of GOx bound using the model system compared favourably to calculations derived from the maximal amperometric functioning of the electrochemical sensor (examined in previously-published literature, Mashazi, P.N., Ozoemena, K.I., Nyokong, T., 2006. Electrochim. Acta 52, 177–186), but not to theoretical values derived from dimensions of GOx as established by crystallography. The strength of the binding of the GOx film with the TCACoPc layer was tested by using 2% SDS as a denaturant/surfactant, and the GOx film was not found to be significantly affected by exposure to this. This paper thus showed that QCM-D can be used in order to model essential processes and interactions that dictate the functional parameters of a biosensor.
- Format
- computer
- Format
- online resource
- Format
- application/pdf
- Format
- 1 online resource (7 pages)
- Format
- Publisher
- Elsevier
- Language
- English
- Relation
- Biosensors and Bioelectronics
- Relation
- Fogel, R., Mashazi, P., Nyokong, T. and Limson, J., 2007. Critical assessment of the quartz crystal microbalance with dissipation as an analytical tool for biosensor development and fundamental studies: metallophthalocyanine–glucose oxidase biocomposite sensors. Biosensors and Bioelectronics, 23(1), pp.95-101
- Relation
- Biosensors and Bioelectronics volume 23 number 1 p. 95 2007 1873-4235
- Rights
- Publisher
- Rights
- Use of this resource is governed by the terms and conditions of the Elsevier Terms and Conditions Statement (https://www.elsevier.com/legal/elsevier-website-terms-and-conditions)
- Rights
- Closed Access
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Collections
Mashazi, Philani N (Associate Prof)
Limson, Janice (Prof)
Nyokong, Tebello (Distinguished Professor)
RU DST/NRF SARChI for Medicinal Chemistry and Nanotechnology
RU Department of Chemistry
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