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Two conventional Zn(II) polyvinyl chloride (PVC) membrane electrodes have been prepared and characterized. They were based on dibenzo-24-crown-8 (DBC) as a neutral carrier, dioctyl phthalate (DOP) as a plasticizer, and potassium tetrakis (p-chlorophenyl) borate, KTpClPB or the halogen-free ionic liquid, tetraoctylammonium dodecylbenzene sulfonate [TOA][DBS] as an additive. The use of ionic liquid...
We report here the preparation of high-magnetization Fe 3 O 4 @SiO 2 @TiO 2 nanoparticles for solid phase extraction of trace amounts of Cd(II), Cr(III), Mn(II) and Cu(II) from environmental waters. The prepared nanoparticles were characterized by scanning electron micrograph (SEM) and transmission electron microscopy (TEM). The high-magnetization nanoparticles carrying...
A novel electrochemical biosensing device that integrates an immunochromatographic test strip and a screen-printed electrode (SPE) connected to a portable electrochemical analyzer was presented for rapid, sensitive, and quantitative detection of disease-related biomarker in human blood samples. The principle of the sensor is based on sandwich immunoreactions between a biomarker and a pair of its antibodies...
A simple and high sensitive technique based on three phase hollow fiber liquid phase microextraction (HF-LPME), optimized by using a four-variable experimental design and response surface methodology was performed to evaluate dextromethorphan hydrobromide (DEX) and chloropheniramine maleate (CLP) simultaneously in human plasma. The influence of source phase pH, HCl concentration of acceptor phase,...
A fully automated microextraction by packed sorbents (MEPS) coupled with large volume injection gas chromatography–mass spectrometry (GC–MS) has been developed for the determination of eight polycyclic aromatic hydrocarbons (PAHs) in environmental water samples. Naphthalene (Nap), pyrene (Pyr), anthracene, acenaphthylene, phenanthrene, fluoranthene (Flr), fluorene and acenaphthene were the PAHs studied...
Fluorine was determined via the rotational molecular absorption line of aluminum mono fluoride (AlF) generated in C 2 H 2 /N 2 O flame at 227.4613nm using a high-resolution continuum source flame atomic absorption spectrophotometer (HR-CS-FAAS). The effects of AlF wavelength, burner height, fuel rate (C 2 H 2 /N 2 O) and amount of Al on the accuracy,...
Bacterial food poisoning is an ever-present threat that can be prevented with proper care and handling of food products. A disposable electrochemical immunosensor for the simultaneous measurements of common food pathogenic bacteria namely Escherichia coli O157:H7 (E. coli), campylobacter and salmonella were developed. The immunosensor was fabricated by immobilizing the mixture of anti-E. coli, anti-campylobacter...
A new and simple cold vapor generation technique utilizing microwave irradiation coupled with atomic fluorescence spectrometry is developed for the speciation analysis of mercury in biological and geological samples. In the presence of formic acid, inorganic mercury (Hg 2+ ) and total mercury (both Hg 2+ and methylmercury (MeHg)) can be converted to mercury cold vapor (Hg 0 ...
A novel biocompatible nanocomposite prepared by Mg 2 Al–Cl layered double hydroxide (LDH) and ionic liquid (IL) 1-carboxyl-methyl-3-methylimidazolium tetrafluoroborate was used as the matrix for the immobilization of myoglobin (Mb). The IL-LDH-Mb composite was characterized by UV–vis adsorption spectroscopy and the results indicated that Mb retained its native structure in the IL-LDH nanocomposite...
Affinity capillary electrophoresis is a powerful analytical tool to extract quantitative information about the binding properties of different interacting systems. The use of LIF detection makes the technique suitable for screening strong binding interactions. The non-equilibrium electrophoretic separations of pre-equilibrated mixtures of ligand and receptor are generally used for such strong molecular...
The electrical explosion of Fe wire in air produced nanoparticles containing the binary mixture of magnetite (Fe 3 O 4 ) and maghemite (γ-Fe 2 O 3 ). The phase identification of magnetite and maghemite by the conventional X-ray diffraction method is not a simple matter because both have the same cubic structure and their lattice parameters are almost identical. Here,...
An automated pressurized liquid extraction (PLE) method followed by Power Prep™ clean-up was developed for organochlorinated pesticide (OCP) and polychlorinated biphenyl (PCB) analysis in environmental marine samples of fish, squid, bivalves, shells, octopus and shrimp. OCPs and PCBs were simultaneously determined in a single chromatographic run using gas chromatography–mass spectrometry-negative...
A simple, rapid and efficient method for the preconcentration of methadone was developed using dispersive liquid–liquid microextraction (DLLME) followed by high performance liquid chromatography with ultra violet detection (HPLC–UV). The extraction method is based on the fast injection of a mixture of extracting and disperser solvents into the aqueous solution to form a cloudy ternary component solvent...
A united method for speciation analysis of Se (IV) and Se (VI) in environmental water samples was developed using nano-sized TiO 2 colloid as adsorbent and hydride generation atomic fluorescence spectrometry (HG-AFS) as determination means. When the pH values of bulk solution were between 6.0 and 7.0, successful adsorption onto 1mL nano-sized TiO 2 colloid (0.2%) was achieved for more...
Traditional ensemble regression algorithms such as BAgging Partial Least Squares (BAPLS) and BOosting Partial Least Squares (BOPLS) do not perform very well in the data set that is relatively small or contaminated by random noise. To make the method robust and improve its prediction ability, inspired from bias–variance–covariance decomposition, we propose an improved ensemble partial least squares...
We report here a highly sensitive electrochemical sensing platform for Ag + detection based on Ag + -induced conformational change of cytosine-rich single stranded DNA C-rich ssDNA probe and the controlled assembly of MWCNTs. In the protocol, the gold electrode was first modified with a dense 16-mercaptohexadecanoic acid self-assembled monolayer (MHA/SAM). The hydrophobic MHA/SAM isolated...
A general bioanalytical platform for biosensor applications was developed based on three-dimensional ordered macroporous (3DOM) gold film modified electrodes using lactate oxidase (LOx) as a case study, within the framework of developing approaches of broad applicability. The electrode was electrochemically fabricated with an inverted opal template, making the surface area of the 3DOM gold electrode...
1,8-Dihydroxyanthraquinone (DHAQ) can form an inclusion complex with β-cyclodextrin(β-CD) in aqueous media, which can be employed to solubilize and stabilize the DHAQ in water. With the assistance of ammonia, the supramolecular DHAQ–β-CD complex showed a selective chromogenic behavior toward Cu 2+ ions by changing the color of the solution from citrus red to purple red, which could be easily...
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