Amperometric nitric oxide biosensor based on the immobilization of hemoglobin on a nanometer-sized gold colloid modified Au electrode

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Title: Amperometric nitric oxide biosensor based on the immobilization of hemoglobin on a nanometer-sized gold colloid modified Au electrode
Author(s): Gu, Hai-Ying; Yu, Ai-Min; Yuan, Su-Su; Chen, Hong-Yuan
Abstract: A novel reagentless NO biosensor based on hemoglobin (Hb) immobilized on nanometer-sized gold colloid particles associated with a cysteamine monolayer on gold electrode surface was presented. The experimental optimization was studied in detail. The immobilized Hb displayed an excellent electrocatalytic response to NO. The electrocatalytic currents were proportional to the NO concentration from 1.2 x 10(-8) to 5.0 x 10(-6) M and the detection limit was as low as 4.0 x 10(-9) M (S/N = 3) with good stability. Arginine, ascorbate, nitrite, uric acid, epinephrine and cystine didn't interfere with the determination of NO. The Michaelis-Menten constant (K-m) was determined to be 0.19 mM. This resulting biosensor has been applied to the direct determination of trace NO in raw blood.
Publication type: Journal article
Source: Analytical Letters, Vol. 35, no. 4 (2002), pp. 647-661
Publication year: 2002
FOR Code(s): 0301 Analytical Chemistry
Keyword(s): Adsorption; Gold colloid; Haemoglobin; Horseradish peroxidase; Microsensors; Monolayer films; Nickel; Nitric oxide; Reagentless biosensors; Reduction; Surfaces; Voltammetry
Publisher: Marcel Dekker (now an imprint of Taylor & Francis)
ISSN: 0003-2719
Publisher URL: http://dx.doi.org/10.1081/AL-120003167
Peer reviewed