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Biosens Bioelectron. 2007 Mar 15;22(8):1593-9. Epub 2006 Aug 14.

High-sensitivity detection for model organophosphorus and carbamate pesticide with quartz crystal microbalance-precipitation sensor.

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Korea Food Research Institute, San 46-1, Baekhyun-dong, Bundang-gu, Songnam-si, Kyonggi-do 463-746, Republic of Korea.


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.

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