Metodika identifikace zdrojů znečišťování pomocí PMF pro strategické rozhodování při ochraně ovzduší – aktualizace 2023
Horník, Štěpán; Sýkora, Jan; Pokorná, Petra
2023 - Czech Předkládaná metodika navrhuje využití spektroskopie nukleární magnetické rezonance (NMR) jako další analytické techniky pro identifikaci sloučenin v atmosférických aerosolech. Tato technika umožňuje výrazně zvýšit počet stanovovaných látek a tfm i případný počet markerů, které lze následně ve spojení s jinými metodami využít pro identifikaci zdrojů znečištění ovzduší pomocí pokročilé statistické analýzy. Mezi markery stanovované pomocí\nNMR spektroskopie náleží různé organické kyseliny, sulfonové kyseliny nebo sacharidy, které jsou charakteristické pro příslušné zdroje znečištění. Aktualizovaná metodika také představuje identifikaci biogenního zdroje, který předcházející metodiky nedokázaly stanovit. The presented methodology proposes utilizatíon of the spectroscopy of nuclear magnetic resonance (NMR) as another analytical technique for the identification of compounds in atmospheric aerosols. This technique makes significantly increases the number of deterined substances and thus a number of possible markers, which can be subsequently used together with other methods to identify sources of air pollution using advanced statistical\nanalysis. Among the markers determined by NMR spectroscopy there are several organic and sulfonic acids or carbohydrates, wich are characteristic for relevant sources of air pollution. The updated methodology also shows the identification of a biogenic source that previous methodologies were not able to determine. Keywords: NMR spectroscopy; atmospheric aerosols; markers Available on request at various institutes of the ASCR Metodika identifikace zdrojů znečišťování pomocí PMF pro strategické rozhodování při ochraně ovzduší – aktualizace 2023

Předkládaná metodika navrhuje využití spektroskopie nukleární magnetické rezonance (NMR) jako další analytické techniky pro identifikaci sloučenin v atmosférických aerosolech. Tato technika umožňuje ...

Horník, Štěpán; Sýkora, Jan; Pokorná, Petra
Ústav chemických procesů, 2023

Zoologické dny Brno 2023: sborník abstraktů z konference 9.-10. února 2023
Bryja, Josef; Horsák, M.; Horsáková, V.
2023 - Czech Keywords: zoology; conference Fulltext is available at external website. Zoologické dny Brno 2023: sborník abstraktů z konference 9.-10. února 2023

Bryja, Josef; Horsák, M.; Horsáková, V.
Ústav biologie obratlovců, 2023

Elektrochemické studium pH závislých redoxních vlastností komplexů mědi s aza-makrocyklickými ligandy
Koláčná, Lucie; Maďar, M.; Kubíček, V.; Ludvík, Jiří
2023 - Czech Molekulární elektronika je progresivní směr moderní materiálové chemie. Zabývá se vývojem\nelektronických prvků na úrovni jedné molekuly. Nejdůmyslnější molekulární elektroniku\nnajdeme v přírodě v podobě metaloenzymů. Jedním ze směrů výzkumu jejich modelů jsou\nkomplexy různě substituovaných azamakrocyklů. Předností těchto molekul je jejich stabilita a\ndobře definovaná syntéza. Investigated Cu(II) complexes are based on plain or cross-bridged cyclam. The\nelectrochemically inactive cyclam was modified by carboxylate, phosphonate, or phenolate\npendant arms. Cu(II) represents the main redox center of the complexes. Modification of the\nligand causes a changed pattern of complex redox response in buffered aqueous solution.\nIrreversible Cu(II) reduction results in complex decomposition to amalgamated copper and\nligand in excess. After Cu(0) electrochemical in situ re-oxidation, copper and ligand are recomplexed.\nComplexes undergo isomerization, accelerated by increasing the temperature. The\ninfluence of pH on complex isomerization and the reversibility of its reduction was described. Keywords: cyclam; Cu(II) complexes; pendant arms Available on request at various institutes of the ASCR Elektrochemické studium pH závislých redoxních vlastností komplexů mědi s aza-makrocyklickými ligandy

Molekulární elektronika je progresivní směr moderní materiálové chemie. Zabývá se vývojem\nelektronických prvků na úrovni jedné molekuly. Nejdůmyslnější molekulární elektroniku\nnajdeme v přírodě v ...

Koláčná, Lucie; Maďar, M.; Kubíček, V.; Ludvík, Jiří
Ústav fyzikální chemie J. Heyrovského, 2023

Determination of Selected Natural Psychoactive Substances in Organic Matrices at 3D Printed Electrodes
Choińska-Mlynarczyk, Marta; Šestáková, Ivana; Navrátil, Tomáš
2023 - English Psilocybin and its derivative psilocin are popular psychoactive substances both as experimental\ntreatments in clinical trials and as illicit drugs. Their potential ability to influence the human\nbrain entails the need for a fast, inexpensive, selective, and sensitive method of their\ndetermination. The aim of our study was the development of new 3D-printed electrodes which\nfulfill these demands and are useful for medical, toxicological, and forensic purposes.\nSuccessful development allows determining in real matrices (human plasma and dried\nmushrooms) concentrations of the order of 1 μmol dm-3.\n Keywords: natural psychoactive substances; 3D-printed electrodes; psilocin; psilocybin Available on request at various institutes of the ASCR Determination of Selected Natural Psychoactive Substances in Organic Matrices at 3D Printed Electrodes

Psilocybin and its derivative psilocin are popular psychoactive substances both as experimental\ntreatments in clinical trials and as illicit drugs. Their potential ability to influence the ...

Choińska-Mlynarczyk, Marta; Šestáková, Ivana; Navrátil, Tomáš
Ústav fyzikální chemie J. Heyrovského, 2023

Utilization of electrochemically induced cleavage of various sulfonimides
Salvadori, Karolína
2023 - English In this work, we describe the unexpected electrochemical cleavage of sulfonimides, providing a direct pathway to corresponding sulfonamides. For this purpose, 16 substances were synthesized and tested, reflecting the influence of different electron effects of -SO2Ph-R substituents, and the impact of the number of nosyl units present in molecules. In the case of octakis-nosylated calixarenes, the electrochemical cleavage via direct potential-controlled electrolysis was compared with conventional organic synthetic procedures. After electrolysis, all prepared sulfonamides were isolated in excellent yields. Keywords: sulfonimides; green chemistry procedures; electrochemisty Available in a digital repository NRGL Utilization of electrochemically induced cleavage of various sulfonimides

In this work, we describe the unexpected electrochemical cleavage of sulfonimides, providing a direct pathway to corresponding sulfonamides. For this purpose, 16 substances were synthesized and ...

Salvadori, Karolína
Ústav chemických procesů, 2023

Green approach for the preparation of biosourced ionic liquids and the study of their thermodynamic properties\n
Souvenir Zafindrajaona, Mahasoa-Salina
2023 - English This presentation will address a green approach to the synthesis of ionic liquids qualified as biosourced (monocatenar or bolaform systems) from specific agro-resources, according to several principles of green chemistry. As these solvents could be used to solubilize lignocellulosic biomass and/or extract bioactive compounds (from plant sourcing), the physicochemical characteristics (density, viscosity and heat capacity) of pure ILs or mixtures of IL/water must be determined. Preliminary results concerning this last point will be presented. Keywords: biosourced ionic liquids; lignocellulosic biomass; thermodynamic properties Available in a digital repository NRGL Green approach for the preparation of biosourced ionic liquids and the study of their thermodynamic properties\n

This presentation will address a green approach to the synthesis of ionic liquids qualified as biosourced (monocatenar or bolaform systems) from specific agro-resources, according to several ...

Souvenir Zafindrajaona, Mahasoa-Salina
Ústav chemických procesů, 2023

Cultivation of Limnospira maxima and utilization of its fresh biomass in human nutrition
Vásquez, Claudia
2023 - English This work aims to enhance productivity, efficiency and sustainability of L. maxima cultivation as well as to determine the safe microbiological conditions for the nutritional use of fresh spirulina biomass. Various parameters such as light intensity, light spectral composition, temperature, pH, CO2, and culture media composition can be optimized. A series of experiments were performed to find the most suitable configuration to cultivate L. maxima, defined by cyanobacterium productivity and yield as well as other metabolites production such as phycocyanin (C-PC) and carotenoids. Keywords: Limnospira maxima; fresh biomass; human nutrition Available in a digital repository NRGL Cultivation of Limnospira maxima and utilization of its fresh biomass in human nutrition

This work aims to enhance productivity, efficiency and sustainability of L. maxima cultivation as well as to determine the safe microbiological conditions for the nutritional use of fresh spirulina ...

Vásquez, Claudia
Ústav chemických procesů, 2023

Organic fluorine content and change during thermal treatmen
Hušek, Matěj
2023 - English We have previously described how pyrolysis affected the content of selected PFAS representatives.4,5 However, we could not determine with certainty whether they were merely cleaved or mineralised. Therefore, we focused on the change in organic fluorine content (part of PFAS) and analysed its thermal behaviour in inert (sea sand) and heterogeneous (sewage sludge) material. Keywords: organic fluorine; sewage sludge; thermal treatment Available in a digital repository NRGL Organic fluorine content and change during thermal treatmen

We have previously described how pyrolysis affected the content of selected PFAS representatives.4,5 However, we could not determine with certainty whether they were merely cleaved or mineralised. ...

Hušek, Matěj
Ústav chemických procesů, 2023

Separation of exosomes from polydisperse suspension in microfluidic devices
Paříková, Anna
2023 - English The work included fine-tuning the experimental methodology, writing an in-house code for exosome tracking based on a one-way\napproach, and performing a parametric study to investigate the separation potential of the microdevice as a function of channel geometry, flow rate, and viscosity. Preliminary results show that viscoelasticmicrofluidics can be used as an alternative to conventional e xosome separation techniques. Keywords: separation techniques; exosomes; microfluidic devices Available in a digital repository NRGL Separation of exosomes from polydisperse suspension in microfluidic devices

The work included fine-tuning the experimental methodology, writing an in-house code for exosome tracking based on a one-way\napproach, and performing a parametric study to investigate the separation ...

Paříková, Anna
Ústav chemických procesů, 2023

Application of In situ TR Spectroelectrochemical Techniques in Determination of Redox Mechanism of Bioactive Compounds
Sokolová, Romana; Jiroušková, Eliška; Degano, I.; Wantulok, J.; Nycz, J.
2023 - English The electron transfer reactions play an important role in many natural processes. Reactions such as \ndissociation, protonation, and reactions with water and other small molecules often occur in \nbiotransformation. The reaction schemes involving these chemical reactions coupled to the \nelectron transfer can be determined by cyclic voltammetry. Additionally, in \nsitu spectroelectrochemistry can efficiently contribute to the determination of oxidation or \nreduction mechanism. This technique provides information about the electroactive chromophore during \nthe redox process allowing to identification the first reaction intermediates. The final reaction \nproducts were identified by chromatographic techniques. This study represents a key role of TR \nspectroelectrochemistry in the determination of reaction intermediates in the case of \n1,10- phenanthroline derivative substituted by bioactive phenothiazine unit and \ndrug 3- fluorophenmetrazine (2-(3-fluorophenyl)-3-methylmorpholine, 3-FPM). Co pound 3-FPM\nhave recently appeared as the new psychoactive substance in the drug market.\n Keywords: IR spectroelectrochemistry; psychoactive substances; oxidation mechanism Available on request at various institutes of the ASCR Application of In situ TR Spectroelectrochemical Techniques in Determination of Redox Mechanism of Bioactive Compounds

The electron transfer reactions play an important role in many natural processes. Reactions such as \ndissociation, protonation, and reactions with water and other small molecules often occur in ...

Sokolová, Romana; Jiroušková, Eliška; Degano, I.; Wantulok, J.; Nycz, J.
Ústav fyzikální chemie J. Heyrovského, 2023