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pubmed-article:16430853pubmed:dateCreated2006-2-20lld:pubmed
pubmed-article:16430853pubmed:abstractTextA bilayer of the polyelectrolytes poly(dimethyldiallylammonium chloride) (PDDA) and poly(sodium 4-styrenesulfonate) (PSS) was formed on a 3-mercapto-1-propanesulfonic-acid-modified Au electrode. Subsequently, multiwall carbon nanotubes (MWCNTs) wrapped by positively charged PDDA were assembled layer-by-layer with negatively charged glucose oxidase (GOx) onto the PSS-terminated bilayer. Electrochemical impedance spectroscopy and atomic force microscopy were adopted to monitor the regular growth of the PDDA-MWCNTs/GOx bilayers. Using GOx as a model enzyme, the assembled multilayer membranes showed some striking features such as the adsorbed form of GOx on individual MWCNT, uniformity, good stability, and electrocatalytic activity toward oxygen reduction. Based on the consumption of dissolved oxygen during the oxidation process of glucose catalyzed by the immobilized GOx, a sensitive amperometric biosensor was developed for the detection of glucose up to 5.0 mM with a detection limit of 58 microM. The sensitivity increased with increasing sensing layers up to five bilayers. Ascorbic acid and uric acid did not cause any interference due to the use of a low operating potential. The present method showed high reproducibility for the fabrication of carbon-nanotubes-based amperometric biosensors.lld:pubmed
pubmed-article:16430853pubmed:languageenglld:pubmed
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pubmed-article:16430853pubmed:statusMEDLINElld:pubmed
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pubmed-article:16430853pubmed:issn0003-2697lld:pubmed
pubmed-article:16430853pubmed:authorpubmed-author:JuHuangxianHlld:pubmed
pubmed-article:16430853pubmed:authorpubmed-author:ZhaoHongtaoHlld:pubmed
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pubmed-article:16430853pubmed:volume350lld:pubmed
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pubmed-article:16430853pubmed:pagination138-44lld:pubmed
pubmed-article:16430853pubmed:dateRevised2006-11-15lld:pubmed
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pubmed-article:16430853pubmed:year2006lld:pubmed
pubmed-article:16430853pubmed:articleTitleMultilayer membranes for glucose biosensing via layer-by-layer assembly of multiwall carbon nanotubes and glucose oxidase.lld:pubmed
pubmed-article:16430853pubmed:affiliationKey Laboratory of Analytical Chemistry for Life Science (Ministry of Education of China), Department of Chemistry, Nanjing University, People's Republic of China.lld:pubmed
pubmed-article:16430853pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:16430853pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed