16905305 |
Kim N, Park IS, Kim DK: High-sensitivity detection for model organophosphorus and carbamate pesticide with quartz crystal microbalance-precipitation sensor. Biosens Bioelectron. 2007 Mar 15;22(8):1593-9. Epub 2006 Aug 14. The effect of acetylcholinesterase (AChE) immobilization over the surface of a quartz crystal microbalance (QCM), by chemisorption of the AChE thiolated with a heterobifunctional cross-linker, sulfo-succinimidyl-6-[3-(2-pyridyldithio) propionamido] hexanoate, and carboxyl-amine coupling of AChE to 3-mercaptopropionic acid self-assembled monolayer, on the responses of a batch-type QCM-precipitation sensor was compared, resulting in a better sensitivity and binding efficiency in the former method. When an inhibition study with the developed sensor was undertaken at the optimized AChE immobilization with varying concentrations of a model organophosphorus pesticide EPN and carbamate one carbofuran, a sensitive detection for them was possible with the limit of detection corresponding to 1.55 x 10 (-8) and 1.30 x 10 (-9) M, respectively. |
32(0,1,1,2) |