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As a first step in a project whose aim is to implement near infrared (NIR) analysis of animal feed on the farm, the present work has examined the possibility of transferring undried grass silage calibrations for dry matter, crude protein, and neutral detergent fiber from a dispersive laboratory NIR instrument (Foss NIRSystem 6500) to a diode array on-site NIR instrument (Zeiss Corona 45 visNIR 1.7)...
A new pretreatment method, solid-phase extraction combined with supramolecular solvents, was proposed for the first time for extraction of diclofenac (DIC) and mefenamic acid (MEF) from urine and water samples. Supramolecular solvent (SUPRAS) is a nano-structured liquid, generated from the amphiphiles through a sequential self-assembly process occurring on two scales, molecular and nano. SUPRAS tested...
The excitation and luminescence spectra of Eu(III) extracted with pivaloyltrifluoroacetone (HA) and/or 2,2′-bipyridyl (B) into CHCl3 were measured. The data were compared to those obtained in an HA/CHCl3 solution into which EuA3 or EuA3B was dissolved. The results are summarized as follows: (1) The degree of HA influence on the luminescence intensity differs in the two systems; in the HA/CHCl3-dissolved...
The paper proposes a simple approach for the preconcentration of carboxylated single-walled carbon nanotubes and their determination in river water samples. The method is based on a microliquid–liquid extraction into an ionic liquid (bmim PF6) in the presence of a cationic surfactant (CTAC). 10μL of the ionic liquid phase are microfiltrated by using a home-made filtration device having a small diameter...
A novel stationary phase based on benzimidazole modified silica was prepared and evaluated as reversed-phase and anion-exchange mixed-mode stationary phase for high performance liquid chromatography (HPLC). Using the phase, polycyclic aromatic hydrocarbons, phthalates, anilines and phenols were respectively separated depending on formation of different types of chemical bonds like hydrogen bonding,...
In this study, gas chromatography (GC) coupled to triple quadrupole tandem mass spectrometry (MS/MS) operated in electron ionisation mode (EI) has been shown to be an effective tool for the (ultra)trace analysis of several representative brominated flame retardants (BFRs) including polybrominated diphenyl ethers (PBDEs), pentabromotoluene (PBT), pentabromoethylbenzene (PBEB), etc. in complex food...
Herein, an electrochemical platform was employed for the detection of protein. Fe2O3 was electrochemically deposited on graphene modified glassy carbon electrode surface. Electrodeposition conditions, such as temperature, and time, were optimized for controlling morphologies and electrochemical activities of Fe2O3. Negatively charged lysozyme-binding aptamer (LBA) was immobilized on positively charged...
Heparin, a highly sulfated polydispersed glycosaminoglycan (GAG), is the most widespread clinical anticoagulant; it binds antithrombin III (AT), a member of serine proteinases superfamily, accelerating its antagonist effect on blood coagulation. The binding interaction with AT is an important aspect in characterization of physicochemical properties of GAGs. With the aim at profiling several clinical...
Extracts from Himalayan herb Dicranostigma lactucoides containing alkaloid chelirubine have been used for centuries in Chinese herbal medicine. We have found a new utilization for the alkaloid: it can be used as a DNA fluorescent probe showing blue (free form) and red (intercalated to DNA) luminescence emission after irradiation by near-UV light. Besides quantification of DNA (LOD=6ngml−1) it can...
Protein phosphorylation is one of the most important post-translational modifications. Due to the dynamic nature and low stoichiometry of the protein phosphorylation, enrichment of phosphopeptides from proteolytic mixtures is necessary prior to their characterization by mass spectrometry. In this work, we synthesized Fe3O4@mesoporous TiO2 magnetic microspheres with core–shell structure and large surface...
There is a significant interest in determining the effects of nanomaterials on the environment and human health. Part or all of the toxicity attributed to silver nanoparticles (nAg) may be due to the release of free silver (Ag+). Therefore, it is necessary to have techniques that will allow the precise determination of free Ag+ within suspensions of nAg particles. Among the different methods used...
A highly efficient and environmentally friendly sample preparation method termed ionic liquid-based ultrasound-assisted emulsification microextraction (IL-USAEME) combined with high performance liquid chromatography has been developed for the determination of four fungicides (azoxystrobin, diethofencarb, pyrimethanil and kresoxim-methyl) in water samples. In this novel approach, ionic liquid (IL)...
A non-enzymatic electrochemical method was developed for glucose detection using a glassy carbon electrode modified with platinum nanoflowers supported on graphene oxide (PtNFs-GO). PtNFs-GO was synthesized using a nontoxic, rapid, one-pot and template-free method. Low-cost, green solvent ethanol acted as the reductant, and the advanced and effective 2D carbon material-GO nanosheet acted as the stabilizing...
The electrocatalytic activity of cobalt(II)–phthalocyanine immobilized in a carbon paste electrode for citric acid oxidation under a diffusion-controlled electrochemical process was employed to develop a selective flow injection amperomettric analysis method. Under optimized conditions, rapid and reliable determinations of citric acid (65 samples per hour) were achieved for analyses of commercial...
A new wet-chemical approach to prepare surface-enhanced Raman scattering (SERS)-active substrates with pitaya-like silver nanostructures (PSNs) was proposed. It has been found that the morphology of as-prepared products is dependent on the reaction parameters. PSNs exhibit a high detection sensitivity of surface-enhanced Raman scattering for Rhodamine 6G (R6G) with a limit of detection of 1.0×10−13...
Sampling is an important part of any measurement process and is therefore recognized as an important contributor to the measurement uncertainty. A reliable estimation of the uncertainty arising from sampling of fuels leads to a better control of risks associated with decisions concerning whether product specifications are met or not. The present work describes and compares the results of three empirical...
Polycyclic aromatic hydrocarbons are ubiquitous compounds, well-known to be carcinogenic, which can reach the food in different ways. Thus the analysis of such compounds has always been of great importance. The aim of the present review, is not only to give an overview of the most recent sample preparation and analytical approaches (such as pressurized liquid extraction, solid-phase microextraction,...
Polyaniline (PANi) patterns on flexible substrate are fabricated for biomolecule detection from live cells. PANi patterns are prepared by inkjet printing on polyethylene terephthalate film. Subsequently, arginine–glycine–aspartate (RGD) peptide is immobilized on the PANi pattern to selectively adhere cells. Rat pheochromocytoma PC12 cells are cultured on the RGD–immobilized PANi pattern, and patterned...
Chromium (CrVI) in water can be determined by adsorptive catalytic cathodic stripping voltammetry in the presence of diethylenetriaminepentaacetic acid (DTPA) and nitrate on the hanging mercury drop electrode (HMDE). Predominately CrVI is detected and the water is UV-digested to convert all Cr to CrVI prior to analysis. We develop here an alternative to the HMDE by using a silver amalgam electrode...
The fluorescence spectroscopy technique is an accurate method and has great utility in the interpretation of complex systems based on several emission bands. An interpretation of the system requires determination of the number, positions and intensities of the spectral components. In this work, the emission spectra of the synthesized ZnSe complex coated with O-phosphorylethanolamine (ZnSe-PEA), both...
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