Detection of staphylococcal enterotoxin A (SEA) at picogram level by a capacitive immunosensor
| Autor: | Jongjit Jantra, Panote Thavarungkul, Punnee Asawatreratanakul, Booncharoen Wongkittisuksa, Chusak Limsakul, Proespichaya Kanatharana |
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| Rok vydání: | 2011 |
| Předmět: |
Detection limit
Orange juice Environmental Engineering Chromatography Meat Analytical chemistry Hydrochloric acid Food Contamination General Medicine Contamination Staphylococcal enterotoxin A Electric Capacitance Dilution Beverages chemistry.chemical_compound Enterotoxins chemistry Electrode Food Microbiology Biosensor Electrodes Immunosorbent Techniques |
| Zdroj: | Journal of environmental science and health. Part A, Toxic/hazardous substancesenvironmental engineering. 46(6) |
| ISSN: | 1532-4117 |
| Popis: | This work presents the use of a flow injection capacitive immunosensor to detect staphylococcal enterotoxin A (SEA). The study was based on the direct detection of a capacitance change due to the binding between SEA and anti-SEA immobilized on a gold electrode. The optimal regeneration solution, flow rate, sample volume and buffer conditions were studied. Under the optimum conditions, this label-free biosensor provided linearity between 1 × 10(-12) g L(-1) and 1 × 10(-8) g L(-1) of SEA and the limit of detection was 1 × 10(-12) g L(-1) which was much lower than the infectious dose (0.5 × 10(-6) - 1 × 10(-6) g L(-1)). Using the regeneration solution of, 15.0 mM glycine-HCl pH 2.20, to break the binding between SEA and the immobilized anti-SEA enabled the electrode to be reused up to 39 times. This technique was applied to analyze SEA in liquid and solid food samples. Any matrix effect can be eliminated by simple dilution. SEA contamination was found in three samples, iced tea with milk (28 ± 1 ng L(-1)), orange juice (113 ± 6 ng L(-1)) and fried chicken (1.1 ± 0.2 ng g(-1)); however, the concentrations were much lower than the infectious dose. The proposed method would be useful for rapid screening of SEA in various matrices. |
| Databáze: | OpenAIRE |
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