Design and Use of a General Capturing Surface in Optical Biosensor Analysis of Sulphamethazine in Milk
| Autor: | Catarina Bergstrom, Åse Sternesjö, Stefan Lofas, Peter Bjurling |
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| Rok vydání: | 1999 |
| Předmět: | |
| Zdroj: | Food and Agricultural Immunology. 11:329-338 |
| ISSN: | 1465-3443 0954-0105 |
| DOI: | 10.1080/09540109999717 |
| Popis: | A new optical biosensor assay, based on a general capturing surface, for detection of the antimicrobial agent sulphamethazine (SMZ) was evaluated and compared with a previously described biosensor assay. At the general surface, the immobilisation is thought to be independent of type of analyte. Monoclonal antibodies against a small molecule (hapten H1) were immobilised and used to capture a conjugate between H1 and SMZ. Polyclonal SMZ antibodies were added to the milk sample and the amount of antibodies bound to the surface was in inverse proportion to the SMZ concentration in the milk sample. The detection limit of the new assay was 0.5 microg kg -1 and within-assay repeatability was 2.4%. This is in agreement with previous results obtained when SMZ was directly immobilised on the surface. Incurred samples from SMZ-treated cows were analysed, and non-specific binding was studied by analyses of individual cow's milk. The advantages of the new assay format include analyte-independent immobilisation and reg... |
| Databáze: | OpenAIRE |
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