Abstract: An enzyme-based monitoring system provides the basis for continuous sampling of organophosphate contamination in air. The enzymes butyrylcholinesterase (BuChE) and organophosphate hydrolase (OPH) are stabilized by encapsulation in biomimetic silica nanoparticles, entrained within a packed bed column. The resulting immobilized enzyme reactors (IMERS) were integrated with an impinger-based aerosol sampling system for collection of chemical contaminants in air. The sampling system was operated continuously and organophosphate detection was performed in real-time by single wavelength analysis of enzyme hydrolysis products. The resulting sensor system detects organophosphates based on either enzyme inhibition (of BuChE) or substrate hydrolysis (by OPH). The system proved suitable for detection of a range or organophosphates including paraoxon, demeton-S and malathion. The detection limits of the IMERs for specific organophosphates are presented and discussed.
| Limitations: |
 APPROVED FOR PUBLIC RELEASE |
| Description: |
Journal article |
| Pages: |
22 |
| Report Date: |
DEC 2006 |
| Contract Number: |
F0863703C6006 |
| Report Number: |
A173464 |
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