期刊
BIOELECTROCHEMISTRY
卷 77, 期 2, 页码 139-144出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.bioelechem.2009.08.001
关键词
PAMAM-Au; Inhibition; Carbofuran; Sensor
资金
- National Natural Science Foundation of China [20675032, 20475017]
- Science and Technology Commission of Shanghai Municipality [06dz05824]
- Shanghai Rising-Star program [06QH14004]
In this paper. an acetylcholinesterase (AChE)/dendrimers polyamidoamine (PAMAM)-Au/Carbon nanotubes (CNTs) multilayer modified electrode based on LbL self-assembled technique was employed in the detection of carbofuran in samples. The configuration of the nanostructure on the electrode provided a favorable environment to the immobilization of AChE. The modified films also improved the electrocatalytic characteristics and electron transfer speed between the films and the surface of electrode. The PAMAM-Au nanoparticles were characterized by SEM and UV-VIS methods. A set of experimental conditions were also optimized for the detection of the pesticides. A linear response over carbofuran concentration in the range of 4.8 x 10(-9) M to 0.9 x 10(-7) M was exhibited with a detection limit of 4.0 x 10(-9) M. The biosensor showed high sensitivity, good stability and reproducibility with promising application. (c) 2009 Elsevier B.V. All rights reserved.
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