ABSTRACT
A novel and sensitive electrochemical sensor based on porous pseudo-carbon paste electrode (PPCPE) for paracetamol detection is described. It was demonstrated that PPCPE exhibits a high selectivity and sensitivity toward paracetamol in comparison with polypyrrole modified carbon paste electrode (PCPE), carbon nanotube modified carbon paste electrode (CNTPE) and carbon paste electrode (CPE), and a detection limit as low as 0.005 mM was obtained.
Subject(s)
Acetaminophen/analysis , Biosensing Techniques/instrumentation , Electrochemistry/instrumentation , Electrodes , Transducers , Equipment Design , Equipment Failure Analysis , PorosityABSTRACT
The photoluminescence properties of europium (III) ions and its complex with 2,2'-bipyridine, [Eu(bpy)2]3+, encapsulated in the hexagonal mesoporous material HMS are reported. X-ray diffraction spectra, ICP analysis, IR spectra, N2 adsorption measurements, and the photoluminescence spectra were used to characterize the corresponding impregnated samples. All the impregnated HMS samples exhibit the typical photoluminescence properties of Eu3+ when excited with a xenon lamp. These results show that HMS is an efficient host lattice for the photoluminescence of the europium (III) ions bound to an appropriate ligand.
Subject(s)
Europium/chemistry , Organometallic Compounds/chemistry , Zeolites/chemistry , Luminescence , Nanostructures , Nanotechnology , Spectroscopy, Fourier Transform Infrared , X-Ray DiffractionABSTRACT
An anodic stripping voltammetric method for the determination of cardiac troponin I (cTnI) at a MCM-41 mesoporous material modified carbon paste electrode (MCM-MCPE) was investigated. The test was based on the dual monoclonal antibody "sandwich" principle using colloidal gold as a labeled substrate. Four main steps were carried out to obtain the analytical signal, i.e. electrode preparation, immunoreaction, silver enhancement, and anodic stripping voltammetric detection. The anodic stripping peak current increased linearly with the concentration of cTnI over the range of 0.8-5.0ng/ml. A detection limit of 0.5ng/ml was obtained. The established method was applied to detect cTnI in acute myocardial infarction (AMI) samples using routine enzyme-linked immunoadsorbent assay (ELISA) for comparison analysis, and good results were obtained.
