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A sensor system for the automatic, in-line, determination of chlorite ion is reported. Electroanalytical measurements were performed in electrolyte-free liquids by using an electrochemical probe (EC), which enables in-line detection in high-resistance media such as disinfected water. Cyclic voltammetry scan rate studies suggest that the current arising from the oxidation of chlorite ion at an EC probe...
A Pt layer/Pt disk electrode configuration was used as a scanning electrochemical microscopy (SECM) probe. The glass seal part of the insulator was covered with a Pt layer to form an exposed pseudo reference electrode. In a HEPES-based medium at pH 7.5, the half-wave potential (E 1/2 ) for [Fe(CN) 6 ] 4− oxidation and O 2 reduction measured versus the internal Pt pseudo...
A series of the polymers imprinted with diphenylamine (DPA) and respective non imprinted polymers were synthesized using precipitation polymerization. Synthesized polymers were characterized by Fourier Transform Infra-Red spectroscopy with Total Attenuated Reflectance (FTIR–ATR), Scanning Electron Microscopy (SEM) and equilibrium batch re-binding experiments. Influence of the synthesis conditions,...
The paper presented with qualitative and quantitative analysis of alkaloids in solid-state, using the excitations within the THz-spectroscopic region of 300–30cm −1 (9.00–0.9THz). Series of nine plant flavonoids (FLs) and their mixtures were analyzed both qualitatively and quantitatively. For first time in the literature was reported the quantitative analysis of alkaloids and their mixtures...
Ultrapure water produced by a water purification system is one of the most essential and widely used reagents in laboratories. However, its quality is usually the least well-characterized and often overlooked. Here we investigate the contamination of ultrapure water by bisphenol A (BPA) leached from a polysulfone (PS) ultrafilter in a water purification system. To evaluate the level of BPA in ultrapure...
A microemulsion enhanced electrochemiluminescence (ECL) of luminol-H 2 O 2 was studied with the flow-injection (FI) technique. The results revealed that the microemulsion composed with cetyltrimethylammonium bromide (CTAB), n-butanol, n-heptane and water greatly enhanced the ECL especially in acidic medium. The ECL emission increased for 20 to 2 times in this microemulsion medium over...
A simple, reliable and sensitive method for the simultaneous determination of caffeic acid phenethyl ester (CAPE) and its metabolite caffeic acid (CA) in dog plasma was developed using liquid chromatography tandem mass spectrometry (LC–MS/MS). The sample pretreatment generally involved protein precipitation treatment (PPT) and direct dilution. CAPE and CA were separated with a C18 reversed-phase column...
A stability-indicating capillary zone electrophoresis (CZE) method was validated for the analysis of granulocyte-macrophage colony-stimulating factor (rhGM-CSF) using leuprorelin acetate (LA), as internal standard (IS). A fused-silica capillary (75μm i.d.; effective length, 72cm) was used at 25°C; the applied voltage was 12kV. The background electrolyte solution consisted of 50mM di-sodium hydrogen...
A new method of solidified floating organic drop microextraction (SFODME) combined with electrothermal vaporization (ETV)-inductively coupled plasma mass spectrometry (ICP-MS) was developed for the determination of trace heavy metals in environmental water samples with sodium diethyldithiocarbamate (DDTC) as both chelating reagent in SFODME and chemical modifier in ETV. The factors affecting the microextraction...
We reported a simple and reusable fluorescent sensor for heme proteins based on the electrospun nanofibrous membrane doped with a fluorescent conjugated polymer P. The sensor showed favorable fluorescence sensing performance towards the heme proteins, including hemoglobin (Hb), myoglobin (Mb) and cytochrome c (Cyt c). The surface wettability and sensing performance of the electrospun nanofibrous membrane...
Haloacetic acids (HAAs) are organic pollutants originated from the drinking water disinfection process, which ought to be controlled and minimized. In this work a method for monitoring haloacetic acids (HAAs) in water samples is proposed, which can be used in quality control laboratories using the techniques most frequently available. Among its main advantages we may highlight its automated character,...
Novel ion-selective electrodes (ISEs) based on amino acids have been developed. l-Tryptophan and l-tyrosine, which are amino acids, are employed as ionophores for solvent polymeric membrane electrodes. The proposed ISEs show rapid Nernstian responses for the Cu 2+ ion over the concentration ranges of 3.0×10 −4 –1.0×10 −1 M. These ISEs exhibit comparatively good selectivity...
Deep Raman spectroscopy has been utilized for the standoff detection of concealed chemical threat agents from a distance of 15m under real life background illumination conditions. By using combined time and space resolved measurements, various explosive precursors hidden in opaque plastic containers were identified non-invasively. Our results confirm that combined time and space resolved Raman spectroscopy...
Chitosan, a cationic polysaccharide containing amino and hydroxyl groups, was used to fabricate an electrochemiluminescence (ECL) sensor. In the sensor construction, a glassy carbon electrode (GCE) was first coated by a chitosan film which embedded gold nanoparticles, and then the film was modified by introducing carboxyl groups on the surface, which were used to immobilize tris(2,2′-bipyridyl)ruthenium(II)...
The multi-walled carbon nanotubes (MWNTs) coated quartz wool (MWNTs/QW) prepared by dynamic layer-by-layer self-assembly was used as solid-phase extraction (SPE) absorbent for on-line separation and preconcentration of lysozyme in egg white. The coating procedures were performed continuously in a flow system operated by a set of sequential injection devices. The quartz wool was placed in a microcolumn...
A novel scheme for the fabrication of gold/platinum hybrid functionalized ZnO nanorods (Pt–Au@ZnONRs) and multiwalled carbon nanotubes (MWCNTs) modified electrode is presented and its application for cholesterol biosensor is investigated. Firstly, Pt–Au@ZnONRs was prepared by the method of chemical synthesis. Then, the Pt–Au@ZnONRs suspension was dropped on the MWCNTs modified glass carbon electrode,...
Using a full factorial design the optimization of experimental conditions of enhanced chemiluminescence reaction (ECR) catalyzed by horseradish peroxidase (HRP-C) in the presence of 3-(10′-phenothiazinyl)propane-1-sulfonate (SPTZ) and 4-morpholinopyridine (MORP) as enhancers was performed. The effect of concentrations of SPTZ, hydrogen peroxide, MORP, luminol, and Tris on a ratio of peroxidase-catalyzed...
A novel fluorimetric assay for dopamine using calcein blue (CB) complexed with Fe 2+ ion as a chemical sensor is described. The fluorescence arising from CB of the CB–Fe 2+ complex is quenched by the Fe 2+ ion. When dopamine is added to a solution of the CB–Fe 2+ complex, a dopamine–Fe 2+ complex is formed as the result of a ligand exchange reaction between...
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