Virtual electrochemical nitric oxide analyzer using copper, zinc superoxide dismutase immobilized on carbon nanotubes in polypyrrole matrix

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• 作者：Thangamuthu Madasamy^a ; Manickam Pandiaraj^a ; Murugesan Balamurugan^a ; Santosh Karnewar^c ; Alby Robson Benjamin^d ; Krishna Arun Venkatesh^b ; Kanagavel Vairamani^b ; Srigiridhar Kotamraju^c ; Chandran Karunakaran^a ; ^{ckaru2000@gmail.com}
• 关键词：Copper ; zinc superoxide dismutase ; Endothelial cells ; Exhaled breath ; Electrochemical nitric oxide analyzer ; Home-made potentiostat ; Virtual instrument
• 刊名：Talanta
• 出版年：2012
• 出版时间：15 October, 2012
• 年：2012
• 卷：100
• 期：Complete
• 页码：168-174
• 全文大小：775 K

文摘

In this work, we have designed and developed a novel and cost effective virtual electrochemical analyzer for the measurement of NO in exhaled breath and from hydrogen peroxide stimulated endothelial cells using home-made potentiostat. Here, data acquisition system (NI MyDAQ) was used to acquire the data from the electrochemical oxidation of NO mediated by copper, zinc superoxide dismutase (Cu,ZnSOD). The electrochemical control programs (graphical user-interface software) were developed using LabVIEW 10.0 to sweep the potential, acquire the current response and process the acquired current signal. The Cu,ZnSOD (SOD1) immobilized on the carbon nanotubes in polypyrrole modified platinum electrode was used as the NO biosensor. The electrochemical behavior of the SOD1 modified electrode exhibited the characteristic quasi-reversible redox peak at the potential, +0.06 V vs. Ag/AgCl. The biological interferences were eliminated by nafion coated SOD1 electrode and then NO was measured selectively. Further, this biosensor showed a wide linear range of response over the concentration of NO from 0.1 ¦ÌM to 1 mM with a detection limit of 0.1 ¦ÌM and high sensitivity of 1.1 ¦ÌA ¦ÌM^?1. The electroanalytical results obtained here using the developed virtual electrochemical instrument were also compared with the standard cyclic voltammetry instrument and found in agreement with each other.