Layer-by-layer assembled DNA functionalized single-walled carbon nanotube hybrids for arsenic(III) detection

• Published in: Electrochemistry communications Vol. 10; no. 6; pp. 872 - 875
• Main Authors: Liu, Yaxiong, Wei, Wanzhi
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 01.06.2008; Amsterdam Elsevier Science; New York, NY
• Subjects: Biological and medical sciences; Biosensors; Biotechnology; DNA biosensor; DNA functionalized single-walled carbon nanotube hybrids; Fundamental and applied biological sciences. Psychology; In a nearly physiological pH environment; Methods. Procedures. Technologies; Redox process; The detection of arsenic(III); Various methods and equipments; Redox process; In a nearly physiological pH environment; DNA biosensor; The detection of arsenic(III); DNA functionalized single-walled carbon nanotube hybrids; Physiological condition; Self-assembled layer; Phosphates; Oxidation reduction; Arsenic; DNA functionalized single-walled carbon nanotube hybrids;DNA biosensor;In a nearly physiological pH environment;Redox process;The detection of arsenic(###); Ammonium(diallyl dimethyl) polymer; Carbon nanotubes; Buffer solution; Carbon; Electrochemical detector; Electrodes; Polyelectrolyte; Singlewalled nanotube; Functionalization; Biosensor; Mixed multilayer; DNA; Detection; Electrochemical reaction; Glassy state; Modified material
• ISSN: 1388-2481; 1873-1902
• DOI: 10.1016/j.elecom.2008.03.013

Based on layer-by-layer assembled DNA functionalized single-walled carbon nanotube hybrids, a DNA biosensor for the detection of arsenic(III) in a nearly physiological pH environment was developed. The redox process between arsenic(III) and arsenic(0) on the biosensor was proved. The growth of those hybrids on glassy carbon electrode was monitored by detecting arsenic(III). The arsenic(III) current on the biosensor was similar over a broad pH range (3.0–8.0) and the limit of detection ( S/ N = 3) was 0.05 μg L −1 at pH 7.0. The biosensor can be reused up to 16 times.