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Potassium-doped carbon nanotubes toward the direct electrochemistry of cholesterol oxidase and its application in highly sensitive cholesterol biosensor

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Title: Potassium-doped carbon nanotubes toward the direct electrochemistry of cholesterol oxidase and its application in highly sensitive cholesterol biosensor
Authors: Li, Xiao-Rong1, Xu, Jing-Juan xujj@nju.edu.cn, Chen, Hong-Yuan1
Source: Electrochimica Acta. Oct2011, Vol. 56 Issue 25, p9378-9385. 8p.
Subjects: Potassium, Semiconductor doping, Carbon nanotubes, Electrochemical sensors, Oxidases, Cholesterol, Oxidation-reduction reaction, Spectrophotometry
Abstract: Abstract: We demonstrate herein a newly developed serum total cholesterol biosensor by using the direct electron transfer of cholesterol oxidase (ChOx), which is based on the immobilization of cholesterol oxidase and cholesterol esterase (ChEt) on potassium-doped multi-walled carbon nanotubes (KMWNTs) modified electrodes. The KMWNTs accelerate the electron transfer from electrode surface to the immobilized ChOx, achieving the direct electrochemistry of ChOx and maintaining its bioactivity. As a new platform in cholesterol analysis, the resulting electrode (ChOx/KMWNTs/GCE) exhibits a sensitive response to free cholesterol, with a linear range of 0.050–16.0μmolL−1 and a detection limit of 5.0nmolL−1 (S/N=3). Coimmobilization of ChEt and ChOx (ChEt/ChOx/KMWNTs/GCE) allows the determination of both free cholesterol and esterified cholesterol. The resulting biosensor shows the same linear range of 0.050–16.0μmolL−1 for free cholesterol and cholesteryl oleate, with the detection limit of 10.0 and 12.0nmolL−1 (S/N=3), respectively. The concentrations of total (free and esterified) cholesterol in human serum samples, determined by using the techniques developed in the present study, are in good agreement with those determined by the well-established techniques using the spectrophotometry. [Copyright &y& Elsevier]
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Database: Engineering Source
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Abstract:Abstract: We demonstrate herein a newly developed serum total cholesterol biosensor by using the direct electron transfer of cholesterol oxidase (ChOx), which is based on the immobilization of cholesterol oxidase and cholesterol esterase (ChEt) on potassium-doped multi-walled carbon nanotubes (KMWNTs) modified electrodes. The KMWNTs accelerate the electron transfer from electrode surface to the immobilized ChOx, achieving the direct electrochemistry of ChOx and maintaining its bioactivity. As a new platform in cholesterol analysis, the resulting electrode (ChOx/KMWNTs/GCE) exhibits a sensitive response to free cholesterol, with a linear range of 0.050–16.0μmolL−1 and a detection limit of 5.0nmolL−1 (S/N=3). Coimmobilization of ChEt and ChOx (ChEt/ChOx/KMWNTs/GCE) allows the determination of both free cholesterol and esterified cholesterol. The resulting biosensor shows the same linear range of 0.050–16.0μmolL−1 for free cholesterol and cholesteryl oleate, with the detection limit of 10.0 and 12.0nmolL−1 (S/N=3), respectively. The concentrations of total (free and esterified) cholesterol in human serum samples, determined by using the techniques developed in the present study, are in good agreement with those determined by the well-established techniques using the spectrophotometry. [Copyright &y& Elsevier]
ISSN:00134686
DOI:10.1016/j.electacta.2011.08.020