A selective nitric oxide nanocomposite biosensor based on direct electron transfer of microperoxidase: Removal of interferences by co-immobilized enzymes.
Summary of "A selective nitric oxide nanocomposite biosensor based on direct electron transfer of microperoxidase: Removal of interferences by co-immobilized enzymes."
A highly selective nitric oxide (NO) biosensor was developed by immobilizing microperoxidase (MP) onto the MWCNT-poly-5,2':5',2â€³-terthiophene-3'-carboxylic acid (PTTCA) nanocomposite. Catalase (CAS) and superoxide dismutase (SOD) co-immobilized on the probe successfully protected the interferences of H(2)O(2) and O(2)(-) during NO detection. The nanocomposite layer showed the direct electron transfer processes of the immobilized CAS, SOD, and MP simultaneously at -0.11/+0.04, -0.33/-0.27, and -0.47/-0.40V vs. Ag/AgCl. Au nanoparticles (AuNPs) were electrodeposited on a glassy carbon surface to enhance the sensitivity of the sensor probe. The layers of CAS/SOD/MP/MWCNT-PTTCA/AuNPs were characterized using SEM, XPS, and QCM. The CAS/SOD/MP/MWCNT-PTTCA/AuNPs probe showed an excellent performance in the electrocatalytic reduction of NO which was attributed to the heme group of MP. Experimental conditions affecting the sensitivity of the biosensor were optimized in terms of pH, temperature, and applied potential. The dynamic range of NO analysis was from 1.0 to 40Î¼M with the detection limit of 4.3Â±0.2nM. The reliability of biosensor was examined for the determination of NO released from the real samples of rat liver, stomach (AGS), and intestinal (HT-29) cancer cells.
Department of Chemistry and Institute of BioPhysio Sensor Technology, Pusan National University, Busan 609-735, South Korea.
This article was published in the following journal.
Name: Biosensors & bioelectronics
- PubMed Source: http://www.ncbi.nlm.nih.gov/pubmed/20864332
- DOI: http://dx.doi.org/10.1016/j.bios.2010.08.070
Medical and Biotech [MESH] Definitions
A free radical gas produced endogenously by a variety of mammalian cells, synthesized from ARGININE by NITRIC OXIDE SYNTHASE. Nitric oxide is one of the ENDOTHELIUM-DEPENDENT RELAXING FACTORS released by the vascular endothelium and mediates VASODILATION. It also inhibits platelet aggregation, induces disaggregation of aggregated platelets, and inhibits platelet adhesion to the vascular endothelium. Nitric oxide activates cytosolic GUANYLATE CYCLASE and thus elevates intracellular levels of CYCLIC GMP.
Nitric Oxide Synthase
An NADPH-dependent enzyme that catalyzes the conversion of L-ARGININE and OXYGEN to produce CITRULLINE and NITRIC OXIDE.
Nitric Oxide Synthase Type I
A CALCIUM-dependent, constitutively-expressed form of nitric oxide synthase found primarily in NERVE TISSUE.
Nitric Oxide Synthase Type Iii
A CALCIUM-dependent, constitutively-expressed form of nitric oxide synthase found primarily in ENDOTHELIAL CELLS.
Nitric Oxide Synthase Type Ii
A CALCIUM-independent subtype of nitric oxide synthase that may play a role in immune function. It is an inducible enzyme whose expression is transcriptionally regulated by a variety of CYTOKINES.
Nitric oxide has been known to play a significant role in the pathophysiology of various disorders of the body. Despite its very short half-life, nitric oxide is known to modulate various neurotransmi...
While the super fluorescence quenching capacity of graphene and graphene oxide (GO) has been extensively employed to develop fluorescent sensors, their own unique fluorescence and its potential for ch...
Preservation of meat with nitrite or nitrate has become important to mankind in controlling meat spoilage and in producing safe and palatable meat products with good keeping properties even at ambient...
The quenched fluorescent intensity of a copper(ii) complex, 1, of a fluorescent ligand, in degassed methanol or aqueous (buffered at pH 7.2) solution, was found to reappear on exposure to nitric oxide...
The concentrations of nitric oxide are decreased in airways of patients with cystic fibrosis. The reasons for this nitric oxide deficiency are incompletely understood but may include reduced productio...
The purpose of the study is to determine if inhaled nitric oxide, a potent and selective pulmonary vasodilator, is beneficial in patients with acute pulmonary embolism causing increased ri...
This blinded, placebo-controlled study will administer inhaled nitric oxide to patients undergoing liver transplantation. The purpose of the study is to test if inhaled nitric oxide preven...
A minimum of 100 patients will be enrolled in the study to demonstrate which diagnostic treatment (oxygen or nitric oxide) is most capable of identifying patients with a reactive pulmonary...
The purpose of this study is to determine whether inhaled nitric oxide is an effective treatment for microcirculatory dysfunction and acute organ system failure in the early stage of sepsi...
The purpose of this study is to look at the long term consequences of prematurity in infants treated with inhaled nitric oxide (iNO) while in the neonatal intensive care unit.