Number of found documents: 4039
Published from to

On UV-Vis Spectroelectrochemistry of Luteolin-7-O-Glucoside
Castano, A.; Sokolová, Romana; Degano, I.
2019 - English
The UV-Vis spectroelectrochemical cell containing an optically transparent platinum net used as the working electrode was tested in two regimes of electrochemical measurement, cyclic voltammetry and chronoamperometry, respectively. A three electrode setup used silver quasi reference electrode and platinum electrode serving as a counter electrode. The calibration of the spectroelectrochemical cell was performed for one-electron oxidation processes as well as for two-electron oxidations. The spectral changes during the oxidation of luteolin-7-O-Glucoside gave the information about the electroactive chromophores in molecule. Resulted spectra were compared with luteolin. The identification of products of oxidation was done by complementary analytical techniques HPLC-DAD and HPLC-ESI-MS/MS. Keywords: spectroelectrochemistry; oxidation; luteolin; antioxidants Available in digital repository of the ASCR
On UV-Vis Spectroelectrochemistry of Luteolin-7-O-Glucoside

The UV-Vis spectroelectrochemical cell containing an optically transparent platinum net used as the working electrode was tested in two regimes of electrochemical measurement, cyclic voltammetry and ...

Castano, A.; Sokolová, Romana; Degano, I.
Ústav fyzikální chemie J. Heyrovského, 2019

Electrochemical Enzymatic Biosensors for Determination of Catecholamines in Flow Systems\n
Josypčuk, Bohdan; Barek, J.; Josypčuk, Oksana
2019 - English
Several biosensors (BS) based on flow enzymatic mini-reactors containing a mesoporous silica powder covered by enzyme laccase or tyrosinase were used for determination of L-DOPA, dopamine, noradrenaline, and adrenaline. The silica powder of MCM-41 with covalently bonded laccase was found to be the best reactor filling for the detection of catecholamines. Relative current response of such BS was 100 % for dopamine, 32.1 % for L-DOPA, 26.2 % for noradrenaline, and 0.71 % for adrenaline. The practical applicability of Lac-MCM41 biosensor was successfully verified by the determination of dopamine and noradrenaline in medical solutions for infusions. Keywords: Enzymatic biosensor; Catecholamines; Flow analysis Available on request at various institutes of the ASCR
Electrochemical Enzymatic Biosensors for Determination of Catecholamines in Flow Systems\n

Several biosensors (BS) based on flow enzymatic mini-reactors containing a mesoporous silica powder covered by enzyme laccase or tyrosinase were used for determination of L-DOPA, dopamine, ...

Josypčuk, Bohdan; Barek, J.; Josypčuk, Oksana
Ústav fyzikální chemie J. Heyrovského, 2019

Optimization of photochemical vapor generation of nickel with ICP-MS detection
Šoukal, Jakub; Musil, Stanislav
2019 - English
Photochemical vapor generation of Ni has been investigated in detail using ICP-MS as the detector. Keywords: photochemical vapor generation; nickel; ICP-MS Available in digital repository of the ASCR
Optimization of photochemical vapor generation of nickel with ICP-MS detection

Photochemical vapor generation of Ni has been investigated in detail using ICP-MS as the detector.

Šoukal, Jakub; Musil, Stanislav
Ústav analytické chemie, 2019

Preparation and Activity on Unsupported Hydrotreating Catalysts.
Moravčík, Jan; Gulková, Daniela; Kaluža, Luděk
2019 - English
The aim of the present work is to investigate reactivity of precursors of CoMo and NiMo catalysts (molar ratio 0.3- Co/(Co-iMo) ol'Co or Ni) in aqueous solution with intention to prepare high surface area (ST) sulfides. Keywords: catalysts; hydrodesulfurization; aqueous solution Available in digital repository of the ASCR
Preparation and Activity on Unsupported Hydrotreating Catalysts.

The aim of the present work is to investigate reactivity of precursors of CoMo and NiMo catalysts (molar ratio 0.3- Co/(Co-iMo) ol'Co or Ni) in aqueous solution with intention to prepare high surface ...

Moravčík, Jan; Gulková, Daniela; Kaluža, Luděk
Ústav chemických procesů, 2019

On-line simultaneous determination of ammonia/ammonium in ambient air
Čapka, Lukáš; Mikuška, Pavel
2019 - English
Presented paper describes methods for on-line determination of gaseous ammonia and particulate ammonium in ambient air. Keywords: ammonia; ammonium; CGU-ACTJU sampler Available in digital repository of the ASCR
On-line simultaneous determination of ammonia/ammonium in ambient air

Presented paper describes methods for on-line determination of gaseous ammonia and particulate ammonium in ambient air.

Čapka, Lukáš; Mikuška, Pavel
Ústav analytické chemie, 2019

LIBS assessment of spatial photon-upconversion nanoparticle distribution in model plants (R. sativus and L. minor)
Modlitbová, P.; Novotný, K.; Hlaváček, Antonín; Pořízka, P.; Kaiser, J.
2019 - English
In the present study, radish (Raphanus sativus L.) and common duckweed (Lemna minor L.) were treated with an aqueous dispersion of carboxylated silica-coated photon-upconversion nanoparticles containing rare-earth elements (Y, Yb, and Er). The total content of rare earths and their bioaccumulation factors were determined in the root, hypocotyl, and leaves of R. sativus after 72 hours, and in L. minor fronds after 168 hours. In R. sativus, translocation factors were determined as the ratio of rare earths content in hypocotyl versus roots and in leaves versus hypocotyl. The lengths of the root and hypocotyl in R. sativus, as well as the frond area in L. minor were monitored as toxicity end points. To distinguish rare-earth bioaccumulation patterns, two-dimensional maps of elemental distribution in the whole R. sativus plant and in L. minor fronds were obtained by using laser-induced breakdown spectroscopy with a lateral resolution of 100 μm. Obtained results revealed that the tested nanoparticles became adsorbed on L. minor fronds and R. sativus roots, and got transferred from roots through the hypocotyl into leaves in R. sativus. Our results show that bioaccumulation patterns and spatial distribution of rare earths in nanoparticle-treated plants differ from those of positive control (the mixture of YCl3, YbCl3, and ErCl3). Keywords: photonupconversion nanoparticles; luminescent nanomaterials; bioaccumulation Available in digital repository of the ASCR
LIBS assessment of spatial photon-upconversion nanoparticle distribution in model plants (R. sativus and L. minor)

In the present study, radish (Raphanus sativus L.) and common duckweed (Lemna minor L.) were treated with an aqueous dispersion of carboxylated silica-coated photon-upconversion nanoparticles ...

Modlitbová, P.; Novotný, K.; Hlaváček, Antonín; Pořízka, P.; Kaiser, J.
Ústav analytické chemie, 2019

Oxidation and Reduction of Selected 1,10-Phenantrolines
Wantulok, J.; Sokolová, Romana; Nycz, J. E.; Degano, I.
2019 - English
Derivatives of 1,10-phenanthroline (Phen) are well-known bident ligands which had a lot of interesting applications thanks to their coordination abilities. Selected 1,10-phenanthroline compounds were studied by electrochemical methods. Depending on their different substituents were observed several oxidation and reduction voltammetric peaks. The study involves also in situ spectroeletrochemistry, infrared spectroscopy and identification of products by HPLC-DAD and HPLC-ESI MS/MS. Keywords: electrochemistry; oxidation mechanism; reduction mechanism Available on request at various institutes of the ASCR
Oxidation and Reduction of Selected 1,10-Phenantrolines

Derivatives of 1,10-phenanthroline (Phen) are well-known bident ligands which had a lot of interesting applications thanks to their coordination abilities. Selected 1,10-phenanthroline compounds were ...

Wantulok, J.; Sokolová, Romana; Nycz, J. E.; Degano, I.
Ústav fyzikální chemie J. Heyrovského, 2019

Chronopotentiometry of Papain Modified by Ruthenium Complexes
Nováková Lachmanová, Štěpánka; Pospíšil, Lubomír; Talbi, B.; Salmain, M.; Hromadová, Magdaléna
2019 - English
Catalytic hydrogen evolution reaction is one of known effects observed during the electrochemical studies of proteins. Constant current chronopotentiometric stripping technique is suitable tool for the study of catalytic hydrogen evolution reaction due to the formation of peak H. This contribution compares the catalytic behaviour of nonmodified papain and its artificial derivatives prepared by the interaction of organometallic complexes of ruthenium with free sulfhydryl group of protein. The comparison of the chronopotentiometric behaviour of papain and its derivatives would help to better understand the catalytic hydrogen evolution reaction in these derivatives. Keywords: papain; ruthenium organometallic complexes; artificial metalloproteins; catalytic hydrogen evolution reaction Available on request at various institutes of the ASCR
Chronopotentiometry of Papain Modified by Ruthenium Complexes

Catalytic hydrogen evolution reaction is one of known effects observed during the electrochemical studies of proteins. Constant current chronopotentiometric stripping technique is suitable tool for ...

Nováková Lachmanová, Štěpánka; Pospíšil, Lubomír; Talbi, B.; Salmain, M.; Hromadová, Magdaléna
Ústav fyzikální chemie J. Heyrovského, 2019

NMR Aerosolomics as a Tool to Distinguish Various Types of Aerosol Samples.
Horník, Štěpán; Schwarz, Jaroslav; Ždímal, Vladimír; Sýkora, Jan
2019 - English
In the recent study, the summer and winter aerosol samples were analyzed using NMR aerosolomics approach. The samples were collected in Prague-Suchdol during summer 2008 and winter 2009 in two different particle size fractions - PM2.5 and PM 10. Around 50 compounds were identified in each aerosol spectrum owing to the comprehensive library. The profile of 86 identified compounds, which were identified in the samples altogether, served as an input data for statistical analysis. Multivariate statistical analysis clearly discriminates the two groups studied. Furthermore, it is possible to determine the most significant compounds. Keywords: atmospheric aerosols; organic compounds; analysis Available in a digital repository NRGL
NMR Aerosolomics as a Tool to Distinguish Various Types of Aerosol Samples.

In the recent study, the summer and winter aerosol samples were analyzed using NMR aerosolomics approach. The samples were collected in Prague-Suchdol during summer 2008 and winter 2009 in two ...

Horník, Štěpán; Schwarz, Jaroslav; Ždímal, Vladimír; Sýkora, Jan
Ústav chemických procesů, 2019

NMR Aerosolomics as a Tool to Distinguish Various Types of Aerosol Samples.
Horník, Štěpán; Schwarz, Jaroslav; Ždímal, Vladimír; Sýkora, Jan
2019 - English
In the recent study, the summer and winter aerosol samples were analyzed using NMR aerosolomics approach. The samples were collected in Prague-Suchdol during summer 2008 and winter 2009 in two different particle size fractions - PM2.5 and PM 10. Around 50 compounds were identified in each aerosol spectrum owing to the comprehensive library. The profile of 86 identified compounds, which were identified in the samples altogether, served as an input data for statistical analysis. Multivariate statistical analysis clearly discriminates the two groups studied. Furthermore, it is possible to determine the most significant compounds. Keywords: atmospheric aerosols; organic compounds; analysis Available in a digital repository NRGL
NMR Aerosolomics as a Tool to Distinguish Various Types of Aerosol Samples.

In the recent study, the summer and winter aerosol samples were analyzed using NMR aerosolomics approach. The samples were collected in Prague-Suchdol during summer 2008 and winter 2009 in two ...

Horník, Štěpán; Schwarz, Jaroslav; Ždímal, Vladimír; Sýkora, Jan
Ústav chemických procesů, 2019

About project

NRGL provides central access to information on grey literature produced in the Czech Republic in the fields of science, research and education. You can find more information about grey literature and NRGL at service web

Send your suggestions and comments to nusl@techlib.cz

Provider

http://www.techlib.cz

Facebook

Other bases