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Wyniki wyszukiwania dla: ANALYTICAL CHEMISTRY
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Distinction of clenbuterol intake from drug or contaminated food of animal origin in a controlled administration trial – the potential of enantiomeric separation for doping control analysis
PublikacjaThe differentiation of clenbuterol abuse and unintentional ingestion by contaminated meat is crucial with respect to the valuation of an adverse analytical finding in human sports doping control. The proportion of the two enantiomers of clenbuterol may serve as potential discriminating parameter. For the determination of the individual enantiomers, specific methods were developed and validated for the different matrices under investigation...
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A Comparative Numerical Simulation Study of Turbulent Non-premixed CO/H2/N2 Syngas Jet Flames
PublikacjaIn the present work, numerical simulations of turbulent non-premixed syngas flame have been performed in Reynolds-Averaged Naver-Stokes turbulence approach using four turbulence-chemistry interaction models. To this aim, we used assumed beta PDF approach, Steady Laminar Flamelet model, Eddy Dissipation Concept and Partially Stirred Reactor model. Numerical results are compared and analysed with respect to two experiments from the...
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Unraveling Energy Transfer and Fluorescence Quenching Dynamics in Biomolecular Complexes: A Comprehensive Study of Imiquimod-Rifampicin Interaction.
PublikacjaIn nature, numerous biomolecules are implicated in charge transfer (CT) and energy transfer (ET) mechanisms crucial for fundamental processes such as photosynthesis. Unveiling these mechanisms is pertinent to multiple disciplines including chemistry, engineering and biochemistry. This letter presents a study involving two molecules forming a model system with efficient ET properties. Specifically, their complex exhibits dark quenching...
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Rainwater chemistry composition in Bellsund: Sources of elements and deposition discrepancies in the coastal area (SW Spitsbergen, Svalbard)
PublikacjaDiscrepancies in rainfall chemistry in Bellsund were found to be influenced by the orographic barrier and related to the variability in the inflow of air masses as well as to the distance of sampling sites from the sea and thus the extent of sea spray impact. This study covers measurements of rainfall (P) and air temperature (T), physicochemical parameters (pH, specific electrolytic conductivity (SEC), major ions (Cl , NO3 , SO4...
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Critical factors for the performance of chip array-based electrical detection of DNA for analysis of pathogenic bacteria
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Detection of DNA Replication Intermediates after Two-Dimensional Agarose Gel Electrophoresis Using a Fluorescein-Labeled Probe
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Gene-based identification of bacterial colonies with an electric chip
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Detection of bacteriophage infection and prophage induction in bacterial cultures by means of electric DNA chips
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Nuclear Activation Methods in the Estimation of Environmental Pollution and the Assessment of the Industrial Plant Impact on the Citizens of Gdansk (Poland)
PublikacjaNeutronowa Analiza Aktywacyjna została wykorzystana do oceny stanu jakości powietrza atmosferycznego na podstawie badań analitycznych stopnia kumulacji zanieczyszczeń nieorganicznych w mchu torfowca, a także składu wód opadowych. Ponadto przedstawiono wyniki badań dotyczących szacowania ryzyka zawodowego pracowników zakładów przemysłowych na podstawie analizy próbek materiału biologicznego pobranego od osób narażonych.
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Comparison of different extraction techniques of polychlorinated biphenyls from sediments samples.
PublikacjaIn this work, problems that may occur during determination of trace levels of polychlorinated biphenyls in sediment samples are described. Main error sources are connected with extraction of analytes prior to final determination. During model studies, polychlorinated biphenyls have been extracted from sedimentreference material (METRANAL 2) with the use of different solvents (dichloromethane, hexsane, and toluene); the process...
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Calibration in Metrological Approach
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Reactions of NO2 with chromium(III) complexes with histamine and pyridoxamine ligands studied by the stopped-flow technique
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Influence of the Extraction Conditions on the Antifungal Properties of Walnut Green Husk Isolates
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Quantitative structure–retention relationships of ionic liquid cations in characterization of stationary phases for HPLC
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Different detection and stacking techniques in capillary electrophoresis for metabolomics
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Picomolar analysis of flavins in biological samples by dynamic pH junction-sweeping capillary electrophoresis with laser-induced fluorescence detection
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Solid-Phase Microextraction for the Determination of Inorganic Ions: Applications and Possibilities
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The simultaneous detection of food dyes from different samples in a 96-well plate by spectrophotometry
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Application of an iron-based porphyrinic metal–organic framework for removal of warfarin from aqueous solutions
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Rapid and sensitive determination of acrylamide in potato crisps using reversed-phase direct immersion single drop microextraction-gas chromatography
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Recent developments in the determination of residual solvents in pharmaceutical products by microextraction methods
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Determination of nicotine in saliva, urine and wastewater samples using tantalum metal organic framework pipette tip micro-solid phase extraction
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Salt saturated single-drop microextraction of malondialdehyde from human plasma before its determination by gas chromatography
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Molecularly imprinted stir bar sorptive extraction coupled with atomic absorption spectrometry for trace analysis of copper in drinking water samples
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Developing a New Micro Cloud Point Extraction Method for Simultaneous Preconcentration and Spectrophotometric Determination of Uranium and Vanadium in Brine
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Simultaneous Removal of Heavy Metals from Wastewater Using Modified Sodium Montmorillonite Nanoclay
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Room temperature ionic liquid-based dispersive liquid–liquid microextraction of uranium in water samples before spectrophotometric determination
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Molecularly Imprinted Polymers for Stir Bar Sorptive Extraction: Synthesis, Characterization, and Application
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Determination of mefenamic acid in urine and pharmaceutical samples by HPLC after pipette-tip solid phase microextraction using zinc sulfide modified carbon nanotubes
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Determination of (S)-warfarin using an activated screen printed gold electrode modified with gold nanoparticles and an enantioselective molecularly imprinted polymer
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Application of Box–Behnken design in the optimization of a simple graphene oxide/zinc oxide nanocomposite-based pipette tip micro-solid phase extraction for the determination of Rhodamine B and Malachite green in seawater samples by spectrophotometry
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Rapid and sensitive determination of fluoride in toothpaste and water samples using headspace single drop microextraction-gas chromatography
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Potential Aluminium(III)- and Gallium(III)-selective Optical Sensors Based on Porphyrazines
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Ultrasensitive internally quenched substrates of human cathepsin L
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Design and synthesis of new substrates of HtrA2 protease
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Novel internally quenched substrate of the trypsin-like subunit of 20S eukaryotic proteasome
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Surface plasmon resonance imaging biosensor for cathepsin G based on a potent inhibitor: Development and applications
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The new fluorogenic substrates of neutrophil proteinase 3 optimized in prime site region
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A new proteinase 3 substrate with improved selectivity over human neutrophil elastase
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Do we need a catalyst in the determination of dissolved organic carbon in environmental samples?
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Methods for quantifying lysophosphatidic acid in body fluids: A review
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Solid phase extraction and sequential elution for pre-concentration of traces of Mn and Zn in analysis of honey by flame atomic absorption spectrometry
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The application of isotopically labeled analogues for the determination of small organic compounds by GC/MS with selected ion monitoring
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Application of single drop extraxtion (SDE) gas chromatography method for the determination of carbonyl compounds in spirits and vodkas
PublikacjaW pracy przedstawiono metodę oznaczania związków karbonylowych w spirytusach i wódkach, wykorzystującą do izolacji i wzbogacania technikę mikroekstrakcji do pojedynczej kropli (SDE)po derywatyzacji analitów O-(2,3,4,5,6-pentafluorobenzylo)hydroksylaminą. Określono optymalne parametry izolacji i wzbogacania aldehydów z roztworów alkoholowych (objętość próbki, objętość kropli, zawartość alkoholu, temperaturę i czas ekstrakcji)....
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A multi-analytical approach to the characterization of natural organic dyestuffs and inorganic substrates present in the 19th-century artistic oil paints manufactured by a French art materials supplier Richard Aines
PublikacjaThis paper presents a comprehensive analysis of artistic paints produced in the 19th century by a French art materials supplier Richard Ain`es. Improved mild extraction with hydrofluoric acid enabled the observation of intact organic dyes. Reversed-phase liquid chromatography with diode-array and mass spectrometry detection was utilised for the identification of 35 dyes present in yellow and red paint samples, and in selected plant...
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A rapid dispersive liquid–liquid microextraction of antimicrobial onion organosulfur compounds in animal feed coupled to gas chromatography-mass spectrometry
PublikacjaA rapid analytical procedure is proposed for determining two antimicrobial onion organosulfur compounds, propyl disulfide (PDS) and propyl propane thiosulfonate (PTSO), in animal feed. The use of PTSO as a natural ingredient in animal feed is allowed due to its antimicrobial activity against pathogenic organisms. Two analytical methodologies using gas chromatography coupled to mass spectrometry (GC-MS) are compared. After the extraction...
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Determination of parent and methylated polycyclic aromatic hydrocarbons in water samples by dispersive liquid–liquid microextraction–two dimensional gas chromatography–time-of-flight mass spectrometry
PublikacjaPolycyclic aromatic hydrocarbons (PAHs) are contaminants frequently found in environmental waters. Owing to their toxic effects, it is important to develop analytical methodologies that allow their fast and reliable determination. Dispersive liquid–liquid microextraction (DLLME) allows a quick extraction of analytes with little organic solvent consumption. The best results regarding sample preparation are obtained when 40 mL of...
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Comparison of High Performance Liquid Chromatography Methods with Different Detectors for Determination of Steroid Hormones in Aqueous Matrices
PublikacjaThis paper presents the development and comparison of procedures for the qualitative and quantitative determination of five estrogenic compounds (17-a-ethynylestradiol, estrone, estradiol, estriol, and progesterone) in drinking water and wastewater samples. Five extraction columns and two disks were tested for their efficiency. The C18 columns were superior on the basis of cost for solid phase extraction of drinking water or sewage....
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A simple modification to improve the accuracy of methylation-sensitive restriction enzyme quantitative polymerase chain reaction
PublikacjaDNA digestion with endonucleases sensitive to CpG methylation such as HpaII followed by polymerase chain reaction (PCR) quantitation is commonly used in molecular studies as a simple and inexpensive solution for assessment of region-specific DNA methylation. We observed that the results of such analyses were highly overestimated if mock-digested samples were applied as the reference.We determined DNA methylation levels in several...
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Solid phase microextraction–comprehensive twodimensional gas chromatography–time-of-flight mass spectrometry: a new tool for determining PAHs in airport runoff water samples
Publikacjafundamental aspect of airport operations is the pollution caused by airport runoff waters. Polycyclic aromatic hydrocarbons (PAHs) are one of the most important groups of xenobiotics which are commonly found in runoff water originating from airports. Only very limited data on the analysis of airport runoff water have been published until now. Therefore, a reliable and accurate analytical method based on headspace solid-phase microextraction...