Mussel adhesive protein-based whole cell array biosensor for detection of organophosphorus compounds
- Mussel adhesive protein-based whole cell array biosensor for detection of organophosphorus compounds
- 서정현; 김창섭; 최봉혁[최봉혁]; 임근배[임근배]; 차형준[차형준]
- RECOMBINANT ESCHERICHIA-COLI; AMPEROMETRIC MICROBIAL BIOSENSOR; NERVE AGENTS; METHYL PARATHION; PERIPLASMIC SECRETION; MYTILUS-EDULIS; HYDROLASE; IMMOBILIZATION; ELECTRODE; PESTICIDES
- Issue Date
- ELSEVIER ADVANCED TECHNOLOGY
- BIOSENSORS & BIOELECTRONICS, v.41, pp.199 - 204
- A whole cell array biosensor for the efficient detection of neurotoxic organophosphate compounds (OPs) was developed through the immobilization of recombinant Escherichia coli cells containing periplasmic-expressing organophosphorus hydrolase (OPH) onto the surface of a 96-well microplate using mussel adhesive protein (MAP) as a microbial cell-immobilizing linker. Both the paraoxon-hydrolyzing activity and fluorescence microscopy analyses demonstrated that the use of MAP in a whole cell biosensor increased the cell-immobilizing efficiency and enhanced the stability of immobilized cells compared to a simple physical adsorption-based whole cell system. Scanning electron microscopic analyses also showed that the E. coli cells were effectively immobilized on the MAP-coated surface without any pretreatment steps. The whole cell array biosensor system, prepared using optimal MAP coating (50 mu g/cm(2)) and cell loading (4 OD600), detected paraoxon levels as low as 5 mu M with high reproducibility, and its quantitative detection range was similar to 5-320 mu M. The MAP-based whole cell array biosensor showed a good long-term stability for 28 day with 80% retained activity and a reusability of up to 20 times. In addition, paraoxon in tap water was also successfully detected without a reduction in sensitivity. Our results indicate that the proposed MAP-based whole cell array system could be used as a potential platform for a stable and reusable whole cell biosensor. (C) 2012 Elsevier B.V. All rights reserved.
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