Journal
ANALYTICA CHIMICA ACTA
Volume 650, Issue 1, Pages 49-53Publisher
ELSEVIER
DOI: 10.1016/j.aca.2009.02.029
Keywords
Insulin; Carbon nanotubes; Electrocatalysis; Proteolysis
Categories
Funding
- NSFC [20675044]
- National Basic Research Program of China [2007CB310500]
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The carbon nanotubes (CNTs) assisted strategy has been proposed for insulin sensing and insulin proteolysis analysis. Experiments demonstrated that this strategy could be used for trace insulin determination with a low detection limit 7.75 ng mL(-1) (S/N = 3) and a detection range from 20 ng mL-1 to 400 ng mL-1. Both biocompatibility and intrinsic conductivity of pristine CNTs enabled them to act an excellent biosensing platform for the realization of direct electrochemistry and electrocatalysis of insulin. Compared with the present methods, the proposed strategy could realize the trace insulin detection without electrode modifications. It is more convenient and simpler than those based on the chemically modified electrodes. This method also made the CNTs as the indicator for insulin proteolysis analysis so that the biological process could be studied by electron microscope, electrochemical methods and digital camera. CNTs obtained after the proteolysis showed the same capabilities as the pristine ones in electrochemical signal enhancement and could participate in the bio-circle repeatedly. (C) 2009 Elsevier B.V. All rights reserved.
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