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Application of capillary electrophoresis in forensic science: Analysis of fireworks
Eliáš, Milan; Maier, V.; Knob, R.
2012 - English
In all samples of fireworks, K+, Na+, Ca2+ and Mg2+ ions were proved and quantified by the method of capillary zone electrophoresis using water solution of 10 mM 4-aminopyridine, titrated with hydroxyisobutyric acid to the pH 4.3, as background electrolyte and indirect UV-absorption detection at 200 nm. Pb2+ or Ba2+ ions were proved in few samples. The other selected inorganic cations were not proved in any sample of selected fireworks. NH4+ ions were not detected in any pre-blast samples, but they were established in some post-blast (glazed tiles) samples.
Keywords:
capillary zone electrophoresis; metal cations; fireworks
Available at various institutes of the ASCR
Application of capillary electrophoresis in forensic science: Analysis of fireworks
In all samples of fireworks, K+, Na+, Ca2+ and Mg2+ ions were proved and quantified by the method of capillary zone electrophoresis using water solution of 10 mM 4-aminopyridine, titrated with ...
Open-tubular capillary electrochromatography with bare gold nanoparticles-based stationary phase applied to separation of trypsin digested proteins
Mikšík, Ivan; Lacinová, Kateřina; Zmatlíková, Zdeňka; Sedláková, Pavla; Král, V.; Sýkora, D.; Řezanka, P.; Kašička, Václav
2012 - English
Open-tubular capillary electrochromatography (OT-CEC) using bare gold nanoparticles-based stationary phase has been applied to separation of tryptic peptide fragments of native and glycated proteins, bovine serum albumin and human transferrin. OT-CEC with bare gold nanoparticles stationary phase was found to be a suitable technique for separation of complex peptide mixtures originating from enzymatic (tryptic) digestion of native and glycated bovine serum albumin and human transferrin, and for glycation studies of these proteins.
Keywords:
open-tubular capillary electrochromatography; gold nanoparticles; glycation of proteins
Available at various institutes of the ASCR
Open-tubular capillary electrochromatography with bare gold nanoparticles-based stationary phase applied to separation of trypsin digested proteins
Open-tubular capillary electrochromatography (OT-CEC) using bare gold nanoparticles-based stationary phase has been applied to separation of tryptic peptide fragments of native and glycated proteins, ...
Separation and determination of isoelectric points of GnRH peptides by capillary electrophoresis in conventional and carrier ampholytes-based background electrolytes
Šolínová, Veronika; Poitevin, M.; Barth, Tomislav; Peltre, G.; Kašička, Václav
2012 - English
Two mixtures of human and salmon gonadotropin releasing hormone (GnRH) derived peptides were successfully separated by capillary zone electrophoresis (CZE) in six classical buffer-based BGEs and by carrier ampholytes-based capillary electrophoresis (CABCE) in the same number carrier ampholytes-based isoelectric BGEs of the same or close pH values. In addition, from the pH dependence of peptide electrophoretic mobilities, the isolectric points of separated peptides were determined.
Keywords:
capillary zone electrophoresis; carrier ampholytes; GnRH peptides
Available at various institutes of the ASCR
Separation and determination of isoelectric points of GnRH peptides by capillary electrophoresis in conventional and carrier ampholytes-based background electrolytes
Two mixtures of human and salmon gonadotropin releasing hormone (GnRH) derived peptides were successfully separated by capillary zone electrophoresis (CZE) in six classical buffer-based BGEs and by ...
Capillary electrophoretic chiral analysis and estimation of helix inversion barrier of helquats using randomly sulfated cyclodextrins as chiral selectors
Kašička, Václav; Koval, Dušan; Sázelová, Petra; Severa, Lukáš; Adriaenssens, Louis; Vávra, Jan; Teplý, Filip
2012 - English
Capillary electrophoresis in acidic sodium phosphate background electrolyte, pH 2.4, with randomly sulfated alpha-, beta- and gamma-cyclodextrins as chiral selectors was employed for fast, high-resolution separation of enantiomers of a series of 24 helquats, a new class of N-heteroaromatic dicationic helicene-like species. The developed CE methodology will be utilized in the further investigation of helquats, e.g., in evaluation of their preparative enantioresolution procedures, in monitoring of their racemization and determination of interconversion barrier of helquat enantiomers.
Keywords:
helquat chiral analysis; capillary electrophoresis; sulfated cyclodextrins
Available at various institutes of the ASCR
Capillary electrophoretic chiral analysis and estimation of helix inversion barrier of helquats using randomly sulfated cyclodextrins as chiral selectors
Capillary electrophoresis in acidic sodium phosphate background electrolyte, pH 2.4, with randomly sulfated alpha-, beta- and gamma-cyclodextrins as chiral selectors was employed for fast, ...
Chiral analysis of beta-alanyl-D,L-tyrosine and its derivatives by capillary electrophoresis with 2-hydroxypropyl-beta-cyclodextrin stereoselector
Sázelová, Petra; Šolínová, Veronika; Schimperková, Tereza; Mášová, Alice; Jiráček, Jiří; Kašička, Václav
2012 - English
A new capillary electrophoretic method was developed for separation of enantiomers of antimicrobial dipeptide betha-Ala-D,L-Tyr and its derivatives using 50 mM Tris-phosphate, pH 2.50, as background electrolyte and 2-hydroxypropyl-betha-cyclodextrin at concentrations 20 – 60 mg/mL as chiral selector. In addition, association constants of complexes of the enatiomers of dipeptide betha-Ala-D,L-Tyr and its derivatives with 2-hydroxypropyl-betha-cyclodextrin chiral selector were determined.
Keywords:
capillary zone electrophoresis; antimicrobial peptides; chiral analysis
Available at various institutes of the ASCR
Chiral analysis of beta-alanyl-D,L-tyrosine and its derivatives by capillary electrophoresis with 2-hydroxypropyl-beta-cyclodextrin stereoselector
A new capillary electrophoretic method was developed for separation of enantiomers of antimicrobial dipeptide betha-Ala-D,L-Tyr and its derivatives using 50 mM Tris-phosphate, pH 2.50, as background ...
Does oxidation make the organic aerosol coatings more hydrophilic? Insight from molecular dynamics study of oxidized surfactant monolayers
Roeselová, Martina; Khabiri, Morteza; Cwiklik, Lukasz
2012 - English
Organic compounds are ubiquitous in atmospheric aerosols. The morphology and structure of the organic phase affect the optical properties of the aerosols, their heterogeneous reactivity as well as their ability to nucleate cloud droplets and ice particles. It is commonly assumed that atmospheric oxidative ageing of the organic material, leading to the formation of polar groups such as carbonyl (=O), hydroxyl (-OH) and carboxylic acid (-COOH), will render the aerosol particle surfaces increasingly more hydrophilic, hence, able to take up more water. Field measurements have shown that a large fraction of the organic material found in aerosols are surface active compounds, such as fatty acids and lipids(Tervahattu, 2002 and 2005). An inverted micelle structure, with an aqueous core surrounded by an organic surfactant layer, has thus been proposed for aqueous aerosols, both marine and continental (Donaldson, 2006). While recent experiments suggest the existence of more complex structures, such as organic inclusions and surfactant lenses (Dennis-Smither, 2012), a monolayer (ML) of surface active organics on an aqueous subphase (the so called Langmuir monolayers) represents the basic model system used in laboratory studies aimed at elucidating the effect of oxidative processes on structural properties of organic coatings on aerosol particles. In our previous work, we used molecular dynamics computer simulations to study the structure and stability of oxidized phospholipid MLs (Khabiri, 2012). In this contribution, we employed the molecular dynamics simulation technique to investigate – with atomistic resolution – structural changes occuring in a fatty acid ML upon moderate degree of oxidation.
Keywords:
atmospheric aerosols; organic coatings; hydrophilic; hydrophobic; oxidation
Available at various institutes of the ASCR
Does oxidation make the organic aerosol coatings more hydrophilic? Insight from molecular dynamics study of oxidized surfactant monolayers
Organic compounds are ubiquitous in atmospheric aerosols. The morphology and structure of the organic phase affect the optical properties of the aerosols, their heterogeneous reactivity as well as ...
Synthesis of conformationally locked carbocyclic nucleosides with norbornane as pseudosugar moiety
Dejmek, Milan; Hřebabecký, Hubert; Šála, Michal; Dračínský, Martin; Nencka, Radim
2011 - English
We describe the chemical synthesis of three novel structural types of conformationally locked carbocyclic nucleosides with norbornane as sugar surrogate. The presented structures bear hydroxymethyl, nucleobase or both in the bridgehead positions of the norbornane pseudosugar and thus adopt three different conformations of the cyclopentane ring – North, South, and East.
Keywords:
norbornane; conformationally locked cyrbocyclic nucleosides
Available at various institutes of the ASCR
Synthesis of conformationally locked carbocyclic nucleosides with norbornane as pseudosugar moiety
We describe the chemical synthesis of three novel structural types of conformationally locked carbocyclic nucleosides with norbornane as sugar surrogate. The presented structures bear hydroxymethyl, ...
3-Fluoro-2-(phosphonomethoxy)propyl hypoxanthine and guanine derivatives as inhibitors of plasmodial hypoxanthine-guanine-xanthine phosphoribosyltransferases
Baszczyňski, Ondřej; Jansa, Petr; Hocková, Dana; Janeba, Zlatko; Dračínský, Martin; Holý, Antonín; Keough, D. T.; de Jersey, J.; Guddat, L. W.
2011 - English
A new methodology for the synthesis of ANPs containing 9-[2-(phosphonoethoxy)ethyl] (PEE) moiety has been developed. FPEP compound containing guanine moiety exhibited inhibition activity against the enzyme in micromolar range without any signs of toxicity.
Keywords:
ANPs; acyclic nucleoside phosphonates; anti-malarial; plasmodium; HGXPRTase
Available at various institutes of the ASCR
3-Fluoro-2-(phosphonomethoxy)propyl hypoxanthine and guanine derivatives as inhibitors of plasmodial hypoxanthine-guanine-xanthine phosphoribosyltransferases
A new methodology for the synthesis of ANPs containing 9-[2-(phosphonoethoxy)ethyl] (PEE) moiety has been developed. FPEP compound containing guanine moiety exhibited inhibition activity against the ...
Enzymatic synthesis of ester prodrugs of DHPA and related compounds by lipases
Blažek, Jiří; Kaiser, M. M.; Zarevúcka, Marie; Králová, B.; Krečmerová, Marcela
2011 - English
An enzymatic method was used for esterification of DHPA and related compounds with vinyl esters and catalyzed by different lipases in non-aqueous media (DMF). Esters of DHPA and other compounds could be synthesized and purified in satisfactory yields.
Keywords:
ester prodrugs; DHPA; lipases; transesterification; vinyl esters
Available at various institutes of the ASCR
Enzymatic synthesis of ester prodrugs of DHPA and related compounds by lipases
An enzymatic method was used for esterification of DHPA and related compounds with vinyl esters and catalyzed by different lipases in non-aqueous media (DMF). Esters of DHPA and other compounds could ...
Piperidine nucleoside phosphonic acid derivatives
Kovačková, Soňa; Dračínský, Martin; Rejman, Dominik
2011 - English
A series of novel phosphonic acid derivatives of piperidine nucleosides was prepared, whereby synthesis of both enantiomeric and diastereomeric derivatives was discussed. Preparation of diphosphate analogs of phosphonic acids derivatives is also described. The prepared nucleotide analogs were tested for their potential biological properties.
Keywords:
piperidine nucleoside; nucleoside phosphonic acids; nucleoside diphosphate analogs; nucleotide analogs
Available at various institutes of the ASCR
Piperidine nucleoside phosphonic acid derivatives
A series of novel phosphonic acid derivatives of piperidine nucleosides was prepared, whereby synthesis of both enantiomeric and diastereomeric derivatives was discussed. Preparation of diphosphate ...
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