AbstractThe review systematizes information on nanostructured materials used in solid-phase extraction (SPE) and its modern versions. The main attention is paid to the consideration of nanostructured analogues of MCM-41 and SBA-15 both in classical SPE and modern versions of solid-phase microextraction, matrix solid-phase dispersion microextraction, dispersive solid-phase extraction, and magnetic SPE

AbstractA review of methods for thermal desorption from concentrators in portable rapid gas chromatographs of the EKhO series for injecting samples of organic substances into a gas chromatographic column depending on the volatility range of substances in the samples is presented. Sample injection techniques without manual operations in EKhO instruments are considered. The principles of sample injection

AbstractIonic liquids based on quaternary ammonium cations—tetrahexylammonium dioctyl sulfosuccinate (THADOSS) and tetrabutylammonium dioctyl sulfosuccinate—were synthesized in situ by mixing aqueous solutions of salts yielding the cation and anion components of the ionic liquid. The ionic liquids were tested for the extraction of heavy metal ions from aqueous solutions. The Cd(II), Co(II), Cu(II)

AbstractDetermination of the total content (сΣ) of similar analytes recalculated to a standard substance Xst is a commonly used but a metrologically incorrect measuring procedure, leading to significant systematic errors (B-type uncertainty). Interval estimate сΣ (Vershinin et al., 2016) is an alternative method that does not require recalculation to Xst and, in contrast to calculating total indices

AbstractTwo simple UV spectrophotometric approaches were developed for the estimation of teriflunomide in both the drug substance and its pharmaceutical dosage form, even in the presence of its two main impurities (namely, A and B). Both approaches involve manipulation of ratio spectra in the range of 200–400 nm using impurity B as a divisor. The first approach involves the dual-wavelength ratio spectra

AbstractA novel naphthalene-based Schiff base ligand (SBL) was synthesized by the condensation of naphthalene-1-8-diamine with 4-dimethylaminobenzaldehyde as a colorimetric probe for the selective detection of Fe3+ ions in ethanol solution. The UV-Vis spectroscopic technique was employed to study the sensing ability of the probe SBL for Fe3+ ions, which was monitored in ethanol solution (pH 4). The

AbstractThe non-destructive control of levofloxacin, non-steroidal anti-inflammatory drugs, acetylsalicylic acid, and vinpocetine in medicines by their intrinsic fluorescence and diffuse reflectance of near-IR radiation using a smartphone and a 3D-printed device is proposed. Blister packs and tablet shells slightly reduce the intensity of the diffuse reflectance signal at a wavelength of 850 nm and

AbstractThe sorption of ion associates of acidic azo dyes, sulfonazo and Congo red, with Dimedrol on polyurethane foams is studied depending on pH, phase contact time, and component ratio. A method for determining Dimedrol in medicinal products is developed based on its sorption as ion associates with dyes and subsequent detection on the sorbent surface by diffuse reflectance spectroscopy.

AbstractThe study demonstrates that the interaction of dopamine with fluorescamine can serve as a basis for a fluorescence assay for dopamine using a camera, as the product formed in this interaction exhibits a fluorescence peak in the visible spectral region (485 nm). Fluorescence can be excited with a light-emitting diode emitting in the near-ultraviolet spectral region (395 nm). The reaction should

AbstractThe study examines the impact of chemically active fluorine-containing additives, namely AlF3, ZnF2, and SrF2, on the evaporation behavior of low- and medium-volatile impurity elements from a crater in a direct current arc electrode in the analysis of graphite powder. The results demonstrate that the use of AlF3 and ZnF2 significantly increases the intensity of spectral lines for the analyzed

AbstractA procedure is proposed for separating trace amounts of gallium from the macrocomponents Cr, Mo, W, Ni, and Co to determine gallium using inductively coupled plasma atomic emission spectroscopy in alloys based on nickel and iron (precision nickel alloys, alloyed and high-alloyed steel). Sodium fluoride was used as a precipitant. Optimal conditions for the coprecipitation of gallium on the precipitate

AbstractThe method of atmospheric pressure laser plasma ionization (APLPI) was investigated to address the task of the rapid detection of physiologically active substances in urine. Urine samples were collected from patients undergoing treatment in hospitals in Moscow. The study demonstrated that the APLPI method, combined with high-resolution mass spectrometry, enables the detection of all analytes

AbstractCoatings for the inner walls of quartz capillaries were obtained using cationic high-molecular-weight chitosan with a degree of deacetylation of 95%. The dependence of the electroosmotic flow velocity on the pH of the background electrolyte was studied and the stability of the coatings under the influence of various solvents was assessed. The results were compared with those for another cationic

AbstractThe following versions of the electrophoretic determination of carbohydrates after derivatization are considered: reductive amination with p-aminobenzoic acid ethyl ester and condensation with 1-phenyl-3-methyl-5-pyrazolone. The derivatization products were separated by capillary zone electrophoresis and in the micellar mode and their characteristics were compared. Reductive amination followed

AbstractThe chromatographic retention of neutral polar compounds (alcohols, ketones, carboxylic acids, carbohydrates, and sweeteners) and compounds in the ionized form (mono- and dibasic organic acids) on cation exchange columns packed with sulfonated poly(styrene-divinylbenzene) having crosslinking degrees of 8% (Nautilus-IE) and 10% (Sevko AA) is studied in ion exclusion chromatography. Using 5 mM

AbstractThe principal aim of this investigation is to improve the precision and accuracy of quantifying sugars, such as glucose, sucrose, and fructose, through the utilization of hydrophilic interaction liquid chromatography (HILIC) with charged aerosol detection (CAD) in Pueraria tuberosa, a plant renowned for its pharmacological properties. Refractive index detectors are commonly employed to determine

AbstractThe results of formation of a calibration concentration of equilibrium toluene vapor under field conditions using the single batch extraction method are presented. A method for the current correction of calibration of a gas chromatograph was substantiated taking into account light flux instability of an electrodeless vacuum ultraviolet lamp of photoionization detector.

AbstractA method is developed for immobilizing a binary gold–palladium (Au–Pd) system on the surface of a glassy carbon (GC) electrode coated with reduced graphene oxide (rGO). Using rGO as a matrix for the inclusion of the Au–Pd binary system significantly enhanced its catalytic activity for the electrooxidation of tetracycline. This improvement is attributed to an increased dispersity of the deposit

AbstractA highly sensitive square-wave adsorptive anodic stripping voltammetric method is described for the determination of ribavirin in its pharmaceutical formulations and human blood serum, utilizing a carbon paste electrode. The peak current was significantly enhanced due to the strong adsorptive properties of the drug at the electrode surface. The optimal procedural parameters were: frequency

AbstractSoils on forest lands are likely characterized by high organic matter content and a diversity of nutrients. Thus, differentiating forest soils from different sites of origin is a challenging task. This study aims to assess the variability of 163 forest soils based on two easily measured physiochemical properties: soil color and pH. The soil samples were collected from 11 different sites across

AbstractThe review describes the current state of research into the analysis of sulfur-containing compounds in crude oils and their refined products by various methods of chromatography and mass spectrometry. However, the absence of universal analysis methods necessitates employing a diverse array of techniques to detect specific groups of sulfur containing compounds (SCCs).

AbstractAmphibian skin secretion provides the primary defense for frogs against various threats, including predators and pathogens. The composition of this secretion, which is rich in peptides, is unique to each amphibian species and may serve as a taxonomic biomarker, not only for frog species but also for their populations. In this study, we sequenced the components of the skin peptidome of frogs

AbstractAmong the numerous applications of 3D printing technology in chemistry, data visualization is one of the most unusual as people are typically accustomed to the idea that digital data exist in a purely abstract form. Gas chromatography—mass spectrometry (GC-MS) data are unsuitable for 3D printing without preliminary data processing, as neighboring extracted ion chromatograms merge into a single

AbstractThe isotopic composition of pedogenic carbonates offers valuable insights into the paleoenvironments in which they formed. However, the analysis of these carbonates is complicated by the simultaneous presence of soil organic matter (SOM) alongside inorganic carbon (IC), the removal of which is a labor-intensive process. Previous research into the influence of organic matter on the isotope analysis

AbstractA new approach has been proposed to determining dibenzothiophenes in diesel fuels by HPLC-MS/MS with electrospray ionization. The developed method is based on the preliminary derivatization of the target compounds through their interaction with aliphatic alcohols in the presence of trifluoromethanesulfonic acid, resulting in the formation of fixed-charge derivatives. These derivatives undergo

AbstractTo improve the accuracy of determining low (ng/g) concentrations of noble metals (Au, Pd, Pt, Rh, Ru, and Ir) in geological samples, we experimentally assessed mass spectral overlapping due to certain rock components. It was found that the ion exchange separation of the matrix does not eliminate the interferences from Zr, Hf, and Ta oxides, and in some cases, the complete removal of these elements

AbstractKraft (sulfate) lignin is a large-scale by-product of the pulp and paper industry and a promising renewable raw material for the production of a wide range of chemicals and materials with high added value. One of the main directions of valorization of technical lignin is conversion into low-molecular-weight phenolic products using various depolymerization methods. To solve the problems of operational

AbstractThe oxidation of hydroquinone with hydrogen peroxide in the presence of catalytic amounts of FeSO4 results in complex mixtures of oligomers. The average composition of these products is determined by the molar ratio of reagents and varies from (C6H4O4)n at the hydroquinone to hydrogen peroxide ratio 1 : 3 to (C6H4O6)n at the ratio 1 : 5. A characteristic feature of MALDI mass spectra for polymers

AbstractA sample containing microparticles of two different uranium materials with distinct uranium isotopic compositions was analyzed during an international experiment. Mass spectrometric analysis of 25 particles revealed that, within the measurement error, six particles had an isotopic composition consistent with that of the first material, and three particles were consistent with the second material

AbstractStudying the chemical composition of snow as an indicator of atmospheric pollution at high latitudes is crucial for understanding the transport processes of pollutants in the atmosphere and assessing the anthropogenic impact on Arctic ecosystems. This study proposes a method for detecting and quantifying semi-volatile micropollutants in snow by combining stir-bar sorptive extraction (SBSE)

AbstractA new approach to detecting dibenzothiophene-5,5-dioxides by soft mass spectrometry methods has been developed. This method involves the chemical modification of target compounds with phenols in the presence of trifluoroacetic anhydride to form organic salts. The cations of these salts are easily desorbed under matrix-assisted laser desorption/ionization (MALDI) conditions and extracted by

AbstractDiarylheptanoids (DAH) are a class of phenolic secondary plant metabolites possessing a wide range of biological activities and pronounced antioxidant properties. This study proposes an original approach to the rapid screening of diarylheptanoids in plant extracts, based on surface-assisted laser desorption/ionization (SALDI) mass spectrometry on target plates with carbon nanocoating and cationization

AbstractThe results of measurements of 235U/238U isotope ratios in microparticles of a reference material performed by Cameca IMS-4f and Cameca IMS 1280-HR mass spectrometers are compared. Twenty-eight particles of various shapes and sizes and also one spherical uranium oxide particle approximately 0.6 μ in size were analyzed by both instruments. These particles were selected based on a preliminary

AbstractThis work is devoted to the analysis of the results obtained during the separation of the mass spectra of apamin and its complex after the deutero-hydrogen substitution of these molecules when leaving the electrospray ion source. The goal of the work was to determine the origin of the structural components identified in apamin and its complex. The separation method assumes that the substitution

AbstractAn ion optical analysis of a static mass analyzer, based on a second-order focusing magnetic mirror, was conducted while accounting for aberrations caused by the movement of ions outside the mean plane of the mass analyzer. As part of this study, an optimization algorithm was developed for the four-dimensional acceptance of the mass analyzer at a fixed resolution, formulated within the framework

AbstractPotato, like other Solanaceae plants, have a small family of eukaryotic translation initiation factors 4E (eIF4E), including four proteins eIF4E-1, eIF4E-2, eIF(iso)4E, and the novel cap-binding protein (nCBP). These factors play roles in the process of the post-transcriptional regulation of gene expression. The eIF4Es are also used by numerous RNA viruses to synthesize their proteins. The