Direct electrochemistry of hemoglobin and myoglobin at didodecyldimethylammonium bromide-modified powder microelectrode and application for electrochemical detection of nitric oxide

Hemoglobin (Hb) and myoglobin (Mb) were immobilized at the didodecyldimethylammonium bromide (DDAB)-modified powder microelectrode (PME) to fabricate Hb-DDAB-PME and Mb-DDAB-PME. Direct electrochemistry of Hb and Mb were achieved on the DDAB-modified PME. The formal potential was -0.224V for Hb and -0.212V for Mb (vs. SCE). The apparent surface concentration of Hb and Mb at the electrode surface was 2.83 x 10(-8) and 9.94 x 10(-8) Mol cm(-2). The Hb-DDAB-PME and Mb-DDAB-PME were successfully applied for measurement of NO in vitro. The anodic current peaks for NO oxidation at +0.7 V and the cathodic current peaks for NO reduction at -0.85V on the CV curves were obtained on the modified electrodes. For detection of NO at +0.7 V, the sensitivity is 3.31 mA mu M-1 cm(-2) for Hb-DDAB-PME and 0.6 mA mu M-1 cm(-2) for Mb-DDAB-PME. The detection limit is 5 nM for Hb-DDAB-PME and 9 nM for Mb-DDAB-PME. The linear response range is 9-100 and 28-330 nM for Hb- and Mb-modified PME, respectively. For the electrochemical detection of NO at -0.85 V by using Hb-DDAB-PME, the detection sensitivity is 39.56 mu A mu M-1 cm(-2); the detection limit is as low as 0.2 mu M; and the linear response range is 1.90-28.08 mu M. (c) 2007 Elsevier B.V. All rights reserved.