Number of found documents: 443
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Generování těkavých specií přechodných kovů pro analytickou atomovou spektrometrii se zaměřením na účinnost generování, prekoncentraci, identitu těkavých specií a studium mechanismu generování
Musil, Stanislav
2018 - Czech
Předkládaný soubor 8 publikovaných prací a jednoho patentu se věnuje právě této problematice. Zaměřili jsme se na studium mechanismu generování a identifikaci těkavých specií v plynné fázi při generovaní Ag1, Au3 a Cu9 s detekcí AAS. Pomocí přístrojů pro charakterizaci velikosti částic aerosolu a transmisní elektronové mikroskopie jsme identifikovali nanočástice těchto kovů v plynné fázi. Keywords: volatile species; atomic absorption spectrometry; generation of volatile species Available on request at various institutes of the ASCR
Generování těkavých specií přechodných kovů pro analytickou atomovou spektrometrii se zaměřením na účinnost generování, prekoncentraci, identitu těkavých specií a studium mechanismu generování

Předkládaný soubor 8 publikovaných prací a jednoho patentu se věnuje právě této problematice. Zaměřili jsme se na studium mechanismu generování a identifikaci těkavých specií v plynné fázi při ...

Musil, Stanislav
Ústav analytické chemie, 2018

Evaluation of the 33 synthesized nitrophenol-based markers of isoelectic point
Duša, Filip; Moravcová, Dana; Šlais, Karel
2018 - English
33 nitrophenol-based compounds, which absorb at ultraviolet as well as visible wavelengths, were selected as candidates for marking isoelectric points (pI) over the pH range from 3 to 10. The evaluation and selection of the candidate structures included structure-based calculations of acid-base properties. The selected compounds were further tested experimentally using capillary isoelectric focusing. The experimental analysis excluded two compounds due to producing double peaks during the analysis. Overall, 31 novel compounds were identified as suitable pI markers. Keywords: nitrophenol-based markers; isoelectic point; capillary isoelectric focusing Fulltext is available at external website.
Evaluation of the 33 synthesized nitrophenol-based markers of isoelectic point

33 nitrophenol-based compounds, which absorb at ultraviolet as well as visible wavelengths, were selected as candidates for marking isoelectric points (pI) over the pH range from 3 to 10. The ...

Duša, Filip; Moravcová, Dana; Šlais, Karel
Ústav analytické chemie, 2018

Chromatographic separation of aflatoxin analogues
Moravcová, Dana; Planeta, Josef; Lunerová, K.; Duša, Filip; Šesták, Jozef; Kubíček, J.; Horká, Marie
2018 - English
Three short particle-packed columns (50 x 2.1 mm) were compared for the rapid and efficient chromatographic separation of aflatoxin G1, G2, B1 and B2 analogues. Keywords: aflatoxin; HPLC; C18 stationary phase Fulltext is available at external website.
Chromatographic separation of aflatoxin analogues

Three short particle-packed columns (50 x 2.1 mm) were compared for the rapid and efficient chromatographic separation of aflatoxin G1, G2, B1 and B2 analogues.

Moravcová, Dana; Planeta, Josef; Lunerová, K.; Duša, Filip; Šesták, Jozef; Kubíček, J.; Horká, Marie
Ústav analytické chemie, 2018

Arduino-based pressure-driven flow controller for droplet microfluidics
Přikryl, Jan; Křivánková, Jana; Hlaváček, Antonín
2018 - English
Droplet-based microfluidic systems bear significant value in an extremely wide range of applications due to its remarkable advantages, nevertheless, their technical demands on precise flow control are high. Here, we present lab-built Arduino-based flow controller fulfilling needs of droplet microfluidics to easily and effectively automate the system. As an additional required accessory, CNC-milled component for vials pressurizing was presented. Keywords: droplet microfluidics; microfluidic systems; pressure regulator Fulltext is available at external website.
Arduino-based pressure-driven flow controller for droplet microfluidics

Droplet-based microfluidic systems bear significant value in an extremely wide range of applications due to its remarkable advantages, nevertheless, their technical demands on precise flow control are ...

Přikryl, Jan; Křivánková, Jana; Hlaváček, Antonín
Ústav analytické chemie, 2018

Rapid fabrication of microextraction devices for direct determination of basic drugs in dried blood spots
Ryšavá, Lenka; Přikryl, Jan; Dvořák, Miloš; Malá, Zdeňka; Kubáň, Pavel
2018 - English
A 3D-printed cutter was designed for rapid fabrication of supported liquid membrane (SLM) extraction devices compatible with injection system of commercial capillary electrophoresis (CE) instrument. Low cost and single use microextraction devices were fabricated from polypropylene micropipette tips with high precision (dimension variances ≤ 3% RSD). Practical applicability of the microextraction devices was examined by in-line coupling of SLM extractions to CE for direct analysis of four model basic drugs in dried blood spot extracts. Excellent repeatability of the hyphenated technique was achieved (RSD ≤ 7.6%), transfer of analytes across the SLM ranged from 23 to 73% and limits of detection were as low as 0.07 μg/mL. Keywords: supported liquid membrane (SLM); capillary electrophoresis; microextraction devices Fulltext is available at external website.
Rapid fabrication of microextraction devices for direct determination of basic drugs in dried blood spots

A 3D-printed cutter was designed for rapid fabrication of supported liquid membrane (SLM) extraction devices compatible with injection system of commercial capillary electrophoresis (CE) instrument. ...

Ryšavá, Lenka; Přikryl, Jan; Dvořák, Miloš; Malá, Zdeňka; Kubáň, Pavel
Ústav analytické chemie, 2018

Determination of permeability of ulra-fine lead oxide aerosols through military filters
Kellnerova, E.; Večeřa, Zbyněk; Kellner, J.; Zeman, T.; Hylak, Č.
2018 - English
Military filters introduced in the Army of the Czech Republic are most commonly used when working with combat equipment and weapons and in manoeuvring activities in the terrain with the use of explosives or chemical warfare agents. During such activities, a large number of pollutants in the form of nanoparticles are released. Nanoparticles, irrespective of their chemical composition, are classified as carcinogenic to humans and therefore it is necessary to eliminate them from the air. Military filters, especially the combined ones, which contain a filtration as well as sorption component, are most widely used and are designed for the widest range of pollutants. However, the current methodology to evaluate the effectiveness of military filters does not fix a duty to monitor the ability of the filters to capture relevant pollutants across the whole range of sizes. The paper evaluates the efficiency of selected types of military filters using the methodology and instrumentation introduced in the accredited laboratories of the Institute of Analytical Chemistry of the Academy of Sciences of the Czech Republic. The testing has been carried out simultaneously with two concentrations of ultra-fine aerosols containing lead oxide nanoparticles ranging in size from 7.6 nm to 299.6 nm. It is an aerosol, the physicochemical and toxicological properties of which are known. During the work the basic parameters of permeability of aerosols tested by filters have been evaluated, especially: size and number of particles in front of and behind the filter, the efficiency and penetration of nanoparticles by the filter. Keywords: nanoparticle; filter; efficiency; health safety Available at various institutes of the ASCR
Determination of permeability of ulra-fine lead oxide aerosols through military filters

Military filters introduced in the Army of the Czech Republic are most commonly used when working with combat equipment and weapons and in manoeuvring activities in the terrain with the use of ...

Kellnerova, E.; Večeřa, Zbyněk; Kellner, J.; Zeman, T.; Hylak, Č.
Ústav analytické chemie, 2018

Maximizing efficiency of field-amplified electrokinetic injection of weak bases for enantioselective capillary electrophoresis with sulfated cyclodextins
Šesták, Jozef; Thormann, W.
2018 - English
The optimal conditions for field-amplified electrokinetic injection of cations followed by their separation based on the stereoselective interaction with sulfated cyclodextrins are discussed. Results show that addition of a short water plug together with a short plug free of cyclodextrins and with a buffer concentration similar to the BGE greatly increase the injection efficiency. Keywords: capillary electrophoresis; cyclodextrins Fulltext is available at external website.
Maximizing efficiency of field-amplified electrokinetic injection of weak bases for enantioselective capillary electrophoresis with sulfated cyclodextins

The optimal conditions for field-amplified electrokinetic injection of cations followed by their separation based on the stereoselective interaction with sulfated cyclodextrins are discussed. Results ...

Šesták, Jozef; Thormann, W.
Ústav analytické chemie, 2018

A New evaluation of combined antitumor effects of natural and synthetic nuclear retinoid receptor ligands in human breast carcinoma cells
Strouhalová, Dana; Laštovičková, Markéta; Bobál, P.; Macejová, D.; Mosná, B.; Brtko, J.; Bobálová, Janette
2018 - English
This work represents the study of the effects of biologically active ligands of nuclear retinoid X receptors, triorganotin compounds, on proteomic profile of MDA-MB-231 cells. We focused primarily on tributyl/phenyltin derivatives that suggest the combined antitumor effect when they are used with natural nuclear retinoid receptor ligand all-trans retinoic acid (ATRA). Proteomic strategies connected to PDQuest evaluation were applied in this study. Some specific proteins with tumor process association were chosen for more detail study. Our findings indicate that selected triorganotins derivatives resulted to significantly reduced level of studied proteins belonging to metabolic pathway or to other cellular processes as apoptosis or epithelial–mesenchymal transition. In the case of vimentin, the key protein of EMT process, the silencing was set up by triorganotin compounds and significantly enhanced by combination with ATRA. This additive effect on downregulation can result from the potential engagement of RXR/RAR heterodimer, considering co-addition of both partner ligands of mentioned heterodimer to the treatment. Keywords: nuclear retinoid X receptors; triorganotin compounds; breast carcinoma cells Fulltext is available at external website.
A New evaluation of combined antitumor effects of natural and synthetic nuclear retinoid receptor ligands in human breast carcinoma cells

This work represents the study of the effects of biologically active ligands of nuclear retinoid X receptors, triorganotin compounds, on proteomic profile of MDA-MB-231 cells. We focused primarily on ...

Strouhalová, Dana; Laštovičková, Markéta; Bobál, P.; Macejová, D.; Mosná, B.; Brtko, J.; Bobálová, Janette
Ústav analytické chemie, 2018

Speciation analysis of As and Hg in biological material
Petry-Podgórska, Inga; Matoušek, Tomáš; Migašová, M.; Zemanová, Veronika; Pavlík, Milan; Pavlíková, D.; Kratzer, Jan
2018 - English
This work was focused on an analysis of arsenic in selected plants and mercury in hair. A combination of HPLC and ICP-MS was used for analysis of biological tissues extracts. The\nspeciation analysis of low molecular arsenic and mercury species like inorganic iAs3+ and iAs5+, methylarsenic and dimethylarsenic forms was carried out with hydride generation (HG)\ntechnique, arsenic peptides and inorganic mercury (iHg2+) and its methylated form (MHg+) - with reverse phase (RP) chromatography and detected by ICP-MS. Keywords: mercury; arsenic; speciation Fulltext is available at external website.
Speciation analysis of As and Hg in biological material

This work was focused on an analysis of arsenic in selected plants and mercury in hair. A combination of HPLC and ICP-MS was used for analysis of biological tissues extracts. The\nspeciation analysis ...

Petry-Podgórska, Inga; Matoušek, Tomáš; Migašová, M.; Zemanová, Veronika; Pavlík, Milan; Pavlíková, D.; Kratzer, Jan
Ústav analytické chemie, 2018

Synthetic approaches for new labeling tags facilitating glycan analysis
Čmelík, Richard; Křenková, Jana; Foret, František
2018 - English
This study is focused on the synthesis of labels based on the pyrene core bearing several ionizable quaternary amines and the efficient carbonyl-reactive group, such as primary amine or hydrazine. Keywords: labeling; organic synthesis; glycan Fulltext is available at external website.
Synthetic approaches for new labeling tags facilitating glycan analysis

This study is focused on the synthesis of labels based on the pyrene core bearing several ionizable quaternary amines and the efficient carbonyl-reactive group, such as primary amine or hydrazine.

Čmelík, Richard; Křenková, Jana; Foret, František
Ústav analytické chemie, 2018

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