Number of found documents: 545
Published from to

Copper complexes with triazoles
Jaklová Dytrtová, Jana; Jakl, M.
2020 - English
Triazoles are artificial chemicals used as fungicides as well as for pharmaceutical treatment. However, their reactivity is highly influenced by the presence of other chemicals. Especially, the presence of copper cations changes the reactivity of triazole by theoretically unexpected way. We have studied the interactions of the triazole ring with copper cations to help explain the reactivity of triazoles as a group. Keywords: triazoles; Cu(I); Cu(II); mass spectrometry; ESI-MS; complexes Available at various institutes of the ASCR
Copper complexes with triazoles

Triazoles are artificial chemicals used as fungicides as well as for pharmaceutical treatment. However, their reactivity is highly influenced by the presence of other chemicals. Especially, the ...

Jaklová Dytrtová, Jana; Jakl, M.
Ústav organické chemie a biochemie, 2020

Separation of triazoles from real samples with capillary electrophoresis
Kovač, Ishak; Jakl, M.; Šolínová, Veronika; Jaklová Dytrtová, Jana
2020 - English
The CE has become one of the advantageous tools in fungicides analysis in complex matrices due to its simplicity and separation efficiency. The separation of a group of thee triazole (i.e. penconazole, tebuconazole, and cyproconazole) fungicides was achieved with CD-MEKC with anionic Sg-CD as a selector at pH=4,8. The background electrolyte consisted of TRIS phosphate buffer (50 mmol/L) and 15 mmol/L SDS. The separation was performed on uncoated fused silica capillary with 500/425 mm (total/effective) length under -15 kV separation voltage. Achieved LOD values with this method were: 0,73, 1,88, 0,60, 1,18 (umol/L) for penconazole, tebuconazole, cyproconazole A and B respectively. Keywords: capillary electrophoresis; penconazole; tebuconazole; cyproconazole; γ-cyclodextrin Available at various institutes of the ASCR
Separation of triazoles from real samples with capillary electrophoresis

The CE has become one of the advantageous tools in fungicides analysis in complex matrices due to its simplicity and separation efficiency. The separation of a group of thee triazole (i.e. ...

Kovač, Ishak; Jakl, M.; Šolínová, Veronika; Jaklová Dytrtová, Jana
Ústav organické chemie a biochemie, 2020

Tebuconazole and its behaviour in the presence of magnesium
Jakl, M.; Jaklová Dytrtová, Jana
2020 - English
Tebuconazole is a fungicide frequently used in agriculture. Its possible impact to (non-)target species is influenced by its presence. Moreover, the presence of triazoles in soil has an impact to bioavailability of nutrients. This study brings the information potentially useful in the evaluation of tebuconazole fate in the environment. The studies based on the electrospray gas phase experiments provide an estimation of the tebuconazole ability to create complexes with magnesium. Keywords: triazoles; Mg(II); mass spectrometry; ESI-MS; complexes Available at various institutes of the ASCR
Tebuconazole and its behaviour in the presence of magnesium

Tebuconazole is a fungicide frequently used in agriculture. Its possible impact to (non-)target species is influenced by its presence. Moreover, the presence of triazoles in soil has an impact to ...

Jakl, M.; Jaklová Dytrtová, Jana
Ústav organické chemie a biochemie, 2020

Localization of double and triple donds positions in fatty acids methylesters by HPLC/APCI-MS2
Horká, Petra; Vrkoslav, Vladimír; Cvačka, Josef
2019 - Czech
Poloha a počet dvojných vazeb v alifatickém řetězci ovlivňuje fyzikální, chemické a biologické vlastnosti lipidů, avšak jednoznačné určení poloh těchto násobných vazeb je problematické. V roce 2012 byla publikována metoda kapalinové chromatografie s chemickou ionizací za atmosférického tlaku s hmotnostní detekcí (HPLC/APCI-MS) [1] vhodná pro analýzu polohy dvojných vazeb využívající tvorby molekulových aduktů [M + C3H5N]+. při APCI za přítomnosti acetonitrilu. Methylestery mastných kyselin (FAMEs) byly analyzovány HPLC/APCI-MS2 se 100% acetonitrilem jako mobilní fází. Při APCI docházelo v plynné fázi k tvorbě reaktivních částic, vznikajících ze složek mobilní fáze, které se vázaly na násobné vazby v alifatickém řetězci FAMEs za vzniku aduktu [M + C3H5N]+.. Kolizně indukovanou disociací (CID) aduktu [M + C3H5N]+., se získaly diagnostické fragmenty určující polohu (polohy) násobných vazeb. Zmíněná metoda byla evaluována pro běžně analyzované polynenasycené FAMEs s tradiční polohu dvojných vazeb (methylene-interrupted). Keywords: acetonitrile-related adducts; multiple bond localization Available at various institutes of the ASCR
Localization of double and triple donds positions in fatty acids methylesters by HPLC/APCI-MS2

Poloha a počet dvojných vazeb v alifatickém řetězci ovlivňuje fyzikální, chemické a biologické vlastnosti lipidů, avšak jednoznačné určení poloh těchto násobných vazeb je problematické. V roce 2012 ...

Horká, Petra; Vrkoslav, Vladimír; Cvačka, Josef
Ústav organické chemie a biochemie, 2019

Structural characterization of fatty acids with triple bond and unusual double bond positions by HPLC/APCI-MS2
Horká, Petra; Vrkoslav, Vladimír; Cvačka, Josef
2019 - English
Fatty acid methyl esters (FAMEs) were analyzed by reversed-phase HPLC coupled to atmospheric pressure chemical ionization (APCI) mass spectrometry. Acetonitrile was used as mobile phase. The gas-phase reactions of acetonitrile and unsaturated FAMEs in the APCI source provided [M + C3H5N]+• adducts. Subsequent MS/MS analysis of these ions gave diagnostic fragments. The formation and fragmentation of the acetonitrile-related adducts were utilized for the structural characterization of FAME with isolated double bonds in (Z)-9,19-hexacosadienoic acid methyl ester, FAME with conjugated double bonds in (Z)-9,11-octadecadienoic acid methyl ester and FAME with a triple bond in 9-octadecynoic acid methyl ester. Keywords: acetonitrile-related adducts; acetylenic lipids; multiple bond localization; mass spectrometry Available at various institutes of the ASCR
Structural characterization of fatty acids with triple bond and unusual double bond positions by HPLC/APCI-MS2

Fatty acid methyl esters (FAMEs) were analyzed by reversed-phase HPLC coupled to atmospheric pressure chemical ionization (APCI) mass spectrometry. Acetonitrile was used as mobile phase. The gas-phase ...

Horká, Petra; Vrkoslav, Vladimír; Cvačka, Josef
Ústav organické chemie a biochemie, 2019

Fotoionizace a fotoaktivace v MS
Cvačka, Josef
2019 - Czech
Keywords: photoionization; photoactivation; mass spectrometry Available at various institutes of the ASCR
Fotoionizace a fotoaktivace v MS

Cvačka, Josef
Ústav organické chemie a biochemie, 2019

Method optimization for simultaneous separation of six triazole fungicides in HPLC
Kovač, Ishak; Martín Miján, P.; Del Sol Vega Alegre, M.; Dejmková, H.; Jaklová Dytrtová, Jana; Schwarzová, K.
2019 - English
Triazole pesticides are widely used in agriculture against fungi pathogens. Their application is not restricted on just one member of the group, more importantly, the application is usually carried out in the mixture of two or more triazoles. Hence, this work focuses on simultaneous separation and detection of six triazole fungicides: penconazole, tebuconazole, propiconazole, cyproconazole, fenbuconazole, and difenoconazole. Two different columns were tested with different parameters for isocratic and gradient elution in HPLC with UV detector. On Purospher Reverse Phase-18 column with gradient elution isomers of triazoles cyproconazole and propiconazole were successfully separated. However, on this column, there was an overlap of some triazoles. In contrast, the isocratic elution on Kromasil Eternity-5-PhenylHexyl column showed sufficient separation capabilities. In further research, chiral separation of triazoles will be considered using capillary electrophoresis. Keywords: capillary electrophoresis; HPLC; triazole pesticides Available at various institutes of the ASCR
Method optimization for simultaneous separation of six triazole fungicides in HPLC

Triazole pesticides are widely used in agriculture against fungi pathogens. Their application is not restricted on just one member of the group, more importantly, the application is usually carried ...

Kovač, Ishak; Martín Miján, P.; Del Sol Vega Alegre, M.; Dejmková, H.; Jaklová Dytrtová, Jana; Schwarzová, K.
Ústav organické chemie a biochemie, 2019

Využití tenkovrstvé chromatografie v analýze lipidů
Cvačka, Josef
2019 - Czech
Keywords: TLC; lipids analysis Available at various institutes of the ASCR
Využití tenkovrstvé chromatografie v analýze lipidů

Cvačka, Josef
Ústav organické chemie a biochemie, 2019

Úvod do vysokorozlišující MS
Cvačka, Josef
2019 - Czech
Keywords: mass spectrometry Available at various institutes of the ASCR
Úvod do vysokorozlišující MS

Cvačka, Josef
Ústav organické chemie a biochemie, 2019

Aldrithiol-2 as a new derivatization agent for double bond localization in unsaturated compounds by mass spectrometry
Strmeň, Timotej; Cvačka, Josef
2019 - English
A new method for localizing double bonds in lipids using derivatization with 2,2'-clipyridyl disulfide (Aldrithio-2) and electrospray ionization mass spectrometry (EST-MS) is presented. The derivatization introduces a permanent charge to the molecules. When collisionally activated, the derivatives provide diagnostic peaks useful for establishing the position of the original double bond. Since permanent charge of the derivative significantly increases the detectability of analytes, the method works well also for of very low polarity like hydrocarbons. Keywords: aldrithiol-2; double bond; electrospray; lipids; mass spectrometry Available at various institutes of the ASCR
Aldrithiol-2 as a new derivatization agent for double bond localization in unsaturated compounds by mass spectrometry

A new method for localizing double bonds in lipids using derivatization with 2,2'-clipyridyl disulfide (Aldrithio-2) and electrospray ionization mass spectrometry (EST-MS) is presented. The ...

Strmeň, Timotej; Cvačka, Josef
Ústav organické chemie a biochemie, 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