Search results for: Grzegorz Schroeder

Items from 1 to 20 out of 191 results

article

Comparison of Cadmium Cd²⁺ and Lead Pb²⁺ Binding by Fe₂O₃@SiO₂‐EDTA Nanoparticles – Binding Stability and Kinetic Studies

Amanda Kulpa, Jacek Ryl, Grzegorz Skowierzak, Adrian Koterwa, more

This study describes the synthesis and characterization of ethylenediaminetetraacetic acid (EDTA) functionalized magnetic nanoparticles of 20 nm in size – Fe₃O₄@SiO₂‐EDTA – which were used as a novel magnetic adsorbent for Cd(II) and Pb(II) binding in aqueous medium. These nanoparticles were obtained in two‐stage synthesis: covering by tetraethyl orthosilicate and functionalization with EDTA derivatives...

article

The Application of the Microwave Plasma Ionization Source in Ambient Mass Spectrometry

Maria Guć, Edward Reszke, Michał Cegłowski, Grzegorz Schroeder

Plasma Chemistry and Plasma Processing > 2019 > 39 > 4 > 1001-1017

A new direct-current microwave argon plasma source was designed and constructed for use in mass spectrometry. Solid samples and analytes on solid materials were examined by means of mass spectrometry. The microwave source was used to generate argon plasma allowing the ionization of analyte particles thermally released from the heated crucible whose temperature could be regulated from 100 to 250 °C...

article

Dendrimer-functionalized halloysite nanotubes for effective drug delivery

Joanna Kurczewska, Michał Cegłowski, Beata Messyasz, Grzegorz Schroeder

Applied Clay Science > 2018 > 153 > C > 134-143

Halloysite nanotubes functionalized with polyamidoamine dendrimer were prepared and characterized. The material studied was applied as a carrier of three model therapeutic compounds - chlorogenic acid, ibuprofen and salicylic acid. It showed higher adsorption capacity for the drugs studied (123.16mg/g for chlorogenic acid; 182.72mg/g for ibuprofen; 39.52mg/g for salicylic acid) compared to raw halloysite...

article

The principles of a new method, MNF-3D, for concentration of magnetic particles in three-dimensional space

Ryszard Krzyminiewski, Bernadeta Dobosz, Grzegorz Schroeder, Joanna Kurczewska

Measurement > 2017 > 112 > C > 137-140

The paper describes a new method, Magnetic Nanoparticles Focusing 3D (MNF-3D), for focusing of magnetic particles at any point in a three-dimensional space 3D in aqueous solutions. The method is based on a rotating magnet system and it uses a special configuration of a rotating magnetic field around a sample. The magnetic field is generated by four permanent neodymium magnets to focus magnetite particles...

article

Valuable natural products from marine and freshwater macroalgae obtained from supercritical fluid extracts

Beata Messyasz, Izabela Michalak, Bogusława Łęska, Grzegorz Schroeder, more

Journal of Applied Phycology > 2018 > 30 > 1 > 591-603

The biologically active compounds (fatty acids, pigments, phenolics, and flavonoid content) were studied in supercritical fluid extracts from the biomass of marine (Ulva clathrata, Cladophora glomerata, Polysiphonia fucoides, and their multi-species mixture) and freshwater (C. glomerata) macroalgae. Different extraction techniques were used in order to compare differences in the biologically active...

article

The dynamics of functionalized magnetite nanoparticles in various solutions studied by ESR method

Bernadeta Dobosz, Ryszard Krzyminiewski, Joanna Kurczewska, Grzegorz Schroeder

Materials Chemistry and Physics > 2017 > 198 > C > 297-302

The article shows the influence of different solvents and coatings on the physical properties of magnetite nanoparticles functionalized with a nitroxide radical - 4-Amino-2,2,6,6-tetramethylpiperidine-N-oxyl. The nanoparticles studied were coated with chitosan or methoxypolyethylene glycol, and dissolved in water, toluene or chloroform. The samples studied were measured using electron spin resonance...

article

Halloysite nanotubes as carriers of vancomycin in alginate-based wound dressing

Joanna Kurczewska, Paulina Pecyna, Magdalena Ratajczak, Marzena Gajęcka, more

Saudi Pharmaceutical Journal > 2017 > 25 > 6 > 911-920

The influence of an inorganic support – halloysite nanotubes – on the release rate and biological activity of the antibiotic encapsulated in alginate-based dressings was studied. The halloysite samples were loaded with approx. 10wt.% of the antibiotic and then encapsulated in Alginate and Gelatin/Alginate gels. The material functionalized with aliphatic amine significantly extended the release of...

article

Molecularly imprinted polymer as drug delivery carrier in alginate dressing

Joanna Kurczewska, Michał Cegłowski, Paulina Pecyna, Magdalena Ratajczak, more

Materials Letters > 2017 > 201 > C > 46-49

Vancomycin was used as a template to obtain a molecularly imprinted polymer. The polymer imprinted with the antibiotic was encapsulated in alginate matrix to obtain a potential antibacterial wound dressing. The amount of vancomycin released in the first 24h after application of the double barrier system decreased with respect to that released from the polymer without the alginate from 87% to 47%....

article

Physico-chemical characterization of formulations containing endomorphin-2 derivatives

Anna Olejnik, Alicja Kapuscinska, Grzegorz Schroeder, Izabela Nowak

Amino Acids > 2017 > 49 > 10 > 1719-1731

In this study semisolid formulations containing AcYPFF (N-acetyl-Tyr-Pro-Phe-Phe-NH₂) tetrapeptide were obtained and characterized in terms of rheology, stability by multiple light scattering and particle size distribution by laser diffraction. Additionally, the release studies of tetrapeptide from formulations obtained were performed. The influence of different factors such as semisolid and membrane...

article

The influence of surface modification, coating agents and pH value of aqueous solutions on physical properties of magnetite nanoparticles investigated by ESR method

Bernadeta Dobosz, Ryszard Krzyminiewski, Joanna Kurczewska, Grzegorz Schroeder

Journal of Magnetism and Magnetic Materials > 2017 > 429 > C > 203-210

The article presents the results of electron spin resonance (ESR) studies for aqueous solutions of functionalized superparamagnetic iron(II,III) oxide nanoparticles. The samples studied differed in type of organic ligands at the magnetite surface, type of coating agent and pH value of aqueous solutions. The ESR spectra of the samples were obtained at room temperature and at 230K. The field cooling...

article

Molecularly imprinted polymers as selective adsorbents for ambient plasma mass spectrometry

Michał Cegłowski, Marek Smoluch, Edward Reszke, Jerzy Silberring, more

Analytical and Bioanalytical Chemistry > 2017 > 409 > 13 > 3393-3405

The application of molecularly imprinted polymers (MIPs) as molecular scavengers for ambient plasma ionization mass spectrometry has been reported for the first time. MIPs were synthesized using methacrylic acid as functional monomer; nicotine, propyphenazone, or methylparaben as templates; ethylene glycol dimethacrylate as a cross-linker; and 2,2′-azobisisobutyronitrile as polymerization initiator...

article

Magnetic mesoporous silica Fe3O4@SiO2@meso-SiO2 and Fe3O4@SiO2@meso-SiO2-NH2 as adsorbents for the determination of trace organic compounds

Dawid Lewandowski, Michał Cegłowski, Marek Smoluch, Edward Reszke, more

Microporous and Mesoporous Materials > 2017 > 240 > C > 80-90

Magnetic nanoparticles, Fe₃O₄@SiO₂@meso-SiO₂ and Fe₃O₄@SiO₂@meso-SiO₂-NH₂, have been prepared and used as adsorbents for the detection of trace organic compounds. Selected organic acids and bases were adsorbed from their solutions onto the surface of suspended magnetic solids. Adsorbents were then attracted by ferrite magnets immersed in the solutions and transferred to the mass spectrometer, where...

article

Fluoro-substituted 2-formylphenylboronic acids: Structures, properties and tautomeric equilibria

Kornelia Kowalska, Agnieszka Adamczyk-Woźniak, Patrycja Gajowiec, Błażej Gierczyk, more

Journal of Fluorine Chemistry > 2016 > 187 > C > 1-8

Four isomeric fluoro-2-formylphenylboronic acids were synthesized and characterized by ¹H, ¹³C, ¹⁹F and ¹⁷O NMR. Molecular and crystal structure of two compounds was determined by single crystal XRD method. pK_a values of all the isomers have been determined by spectrophotometric method and compared with the results for the corresponding benzoxaboroles as well as fluoro- and formylphenylboronic acids...

article

Electro‐oxidation of diclofenac in methanol as studied by high‐performance liquid chromatography/electrospray ionization mass spectrometry

Rafał Frański, Maciej Zalas, Błażej Gierczyk, Grzegorz Schroeder

Rapid Communications in Mass Spectrometry > 30 > 13 > 1662 - 1666

article

Diffusion of functionalized magnetite nanoparticles forced by a magnetic field studied by EPR method

Bernadeta Dobosz, Ryszard Krzyminiewski, Grzegorz Schroeder, Joanna Kurczewska

Current Applied Physics > 2016 > 16 > 5 > 562-567

The article shows the influence of time of the inhomogeneous magnetic field application and the type of coverage on the behavior of functionalized magnetite nanoparticles. TEMPO-functionalized and polymer-coated nanoparticles (Fe₃O₄@PEG) in water solution were subjected to a magnetic field for 1, 2 and 4 min, while the same nanoparticles mixed with bovine serum for 1 and 2 min. TEMPO-functionalized...

article

FAPA mass spectrometry of designer drugs

Marek Smoluch, Blazej Gierczyk, Edward Reszke, Michal Babij, more

Talanta > 2016 > 146 > Complete > 29-33

Application of a flowing atmospheric-pressure afterglow ion source for mass spectrometry (FAPA-MS) for the analysis of designer drugs is described. In this paper, we present application of FAPA MS for identification of exemplary psychotropic drugs: JWH-122, 4BMC, Pentedrone, 3,4-DNNC and ETH-CAT. We have utilized two approaches for introducing samples into the plasma stream; first in the form of a...

article

Flowing atmospheric pressure afterglow combined with laser ablation for direct analysis of compounds separated by thin-layer chromatography

Michał Cegłowski, Marek Smoluch, Edward Reszke, Jerzy Silberring, more

Analytical and Bioanalytical Chemistry > 2016 > 408 > 3 > 815-823

A thin-layer chromatography-mass spectrometry (TLC-MS) setup for characterization of low molecular weight compounds separated on standard TLC plates has been constructed. This new approach successfully combines TLC separation, laser ablation, and ionization using flowing atmospheric pressure afterglow (FAPA) source. For the laser ablation, a low-priced 445-nm continuous-wave diode laser pointer, with...

article

Will the use of double barrier result in sustained release of vancomycin? Optimization of parameters for preparation of a new antibacterial alginate-based modern dressing

Joanna Kurczewska, Paulina Sawicka, Magdalena Ratajczak, Marzena Gajęcka, more

International Journal of Pharmaceutics > 2015 > 496 > 2 > 526-533

The aim of this research was to prepare and characterize an alginate-based wound dressing containing vancomycin immobilized at the silica surface. The silica samples functionalized with amine, diol and carboxylic acid groups were loaded with 7.8, 5.7 and 7.1wt.% of the antibiotic respectively. The immobilized drug was encapsulated in alginate or gelatin/alginate gels and the average concentration...

article

Fluorescence properties of riboflavin-functionalized mesoporous silica SBA-15 and riboflavin solutions in presence of different metal and organic cations

Dawid Lewandowski, Grzegorz Schroeder, Mirosław Sawczak, Tadeusz Ossowski

Journal of Physics and Chemistry of Solids > 2015 > 85 > C > 56-61

Riboflavin was covalently linked to mesoporous SBA-15 silica surface via grafting technique. Then fluorescence properties of the system obtained were analyzed in the presence of several metal and organic cations. Both quenching and strengthening of fluorescence as well as significant changes in the maximum fluorescence wavelength were observed. The results were compared with absorption and fluorescence...

article

The tetrapeptide N-acetyl-Pro-Pro-Tyr-Leu in skin care formulations—Physicochemical and release studies

Anna Olejnik, Grzegorz Schroeder, Izabela Nowak

International Journal of Pharmaceutics > 2015 > 492 > 1-2 > 161-168

Recently there has been a growth of interest in the novel skin care formulations containing active ingredients such as low molecular weight peptides. In this paper we present new skincare formulations such as hydrogels, oil-in-water emulsions and water-in-oil emulsion containing a tetrapeptide (N-acetyl-Pro-Pro-Tyr-Leu). These formulations were characterized in terms of physicochemical parameters...

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PM5 CALCULATION (19)
1H NMR (18)
ESI MS (13)
MASS SPECTROMETRY (13)
FT-IR (12)
LASALOCID (11)
COSY (10)
13C NMR (9)
COMPLEXES (8)
HETCOR (8)
LASALOCID ESTER (8)
SUPRAMOLECULAR CHEMISTRY (8)
ADSORPTION (7)
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SI-PODAND (6)
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1 3 C NMR (5)
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INFONA - science communication portal

Search results for: Grzegorz Schroeder

Comparison of Cadmium Cd²⁺ and Lead Pb²⁺ Binding by Fe₂O₃@SiO₂‐EDTA Nanoparticles – Binding Stability and Kinetic Studies

The Application of the Microwave Plasma Ionization Source in Ambient Mass Spectrometry

Dendrimer-functionalized halloysite nanotubes for effective drug delivery

The principles of a new method, MNF-3D, for concentration of magnetic particles in three-dimensional space

Valuable natural products from marine and freshwater macroalgae obtained from supercritical fluid extracts

The dynamics of functionalized magnetite nanoparticles in various solutions studied by ESR method

Halloysite nanotubes as carriers of vancomycin in alginate-based wound dressing

Molecularly imprinted polymer as drug delivery carrier in alginate dressing

Physico-chemical characterization of formulations containing endomorphin-2 derivatives

The influence of surface modification, coating agents and pH value of aqueous solutions on physical properties of magnetite nanoparticles investigated by ESR method

Molecularly imprinted polymers as selective adsorbents for ambient plasma mass spectrometry

Magnetic mesoporous silica Fe3O4@SiO2@meso-SiO2 and Fe3O4@SiO2@meso-SiO2-NH2 as adsorbents for the determination of trace organic compounds

Fluoro-substituted 2-formylphenylboronic acids: Structures, properties and tautomeric equilibria

Electro‐oxidation of diclofenac in methanol as studied by high‐performance liquid chromatography/electrospray ionization mass spectrometry

Diffusion of functionalized magnetite nanoparticles forced by a magnetic field studied by EPR method

FAPA mass spectrometry of designer drugs

Flowing atmospheric pressure afterglow combined with laser ablation for direct analysis of compounds separated by thin-layer chromatography

Will the use of double barrier result in sustained release of vancomycin? Optimization of parameters for preparation of a new antibacterial alginate-based modern dressing

Fluorescence properties of riboflavin-functionalized mesoporous silica SBA-15 and riboflavin solutions in presence of different metal and organic cations

The tetrapeptide N-acetyl-Pro-Pro-Tyr-Leu in skin care formulations—Physicochemical and release studies

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