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Development of a rapid low cost fluorescent biosensor for the detection of food contaminants
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Radiology, Oncology and Radiation Science, Biomedical Radiation Sciences.
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2013 (English)In: Biosensors & bioelectronics, ISSN 0956-5663, E-ISSN 1873-4235, Vol. 41, no 1, 96-102 p.Article in journal (Refereed) Published
Abstract [en]

A prototype fluorescent based biosensor has been developed for the antibody based detection of food related contaminants. Its performance was characterised and showed a typical antibody binding signal of 200-2000. mV, a short term noise of 9.1. mV, and baseline slope of -0.016. mV/s over 4. h. Bulk signal detection repeatability (n=23) and reproducibility (n=3) were less than 2.4%CV. The biosensor detection unit was evaluated using two food related model systems proving its ability to monitor both binding using commercial products and inhibition through the development of an assay. This assay development potential was evaluated by observing the biosensor's performance whilst appraising several labelled antibody and glass slide configurations. The molecular interaction between biotin and an anti-biotin antibody was shown to be inhibited by 41% due to the presence of biotin in a sample. A food toxin (domoic acid) calibration curve was produced, with %CVs ranging from 2.7 to 7.8%, and a midpoint of approximately 17. ng/ml with further optimisation possible. The ultimate aim of this study was to demonstrate the working principles of this innovative biosensor as a potential portable tool with the opportunity of interchangeable assays. The biosensor design is applicable for the requirements of routine food contaminant analysis, with respect to performance, functionality and cost.

Place, publisher, year, edition, pages
2013. Vol. 41, no 1, 96-102 p.
Keyword [en]
Domoic acid, Food contaminants, Low cost, Optical biosensor, Prototype fluorescence biosensor
National Category
Medical and Health Sciences
URN: urn:nbn:se:uu:diva-191975DOI: 10.1016/j.bios.2012.07.081ISI: 000314191300011OAI: oai:DiVA.org:uu-191975DiVA: diva2:600731
Available from: 2013-01-25 Created: 2013-01-15 Last updated: 2013-03-04Bibliographically approved

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