Full-text resources of PSJD and other databases are now available in the new Library of Science.
Visit https://bibliotekanauki.pl
Preferences help
Polish version English version Language
enabled [disable] Abstract
Number of results

Results found: 4

Number of results on page
first rewind previous Page / 1 next fast forward last

Search results

help Sort By:

help Limit search:
first rewind previous Page / 1 next fast forward last
1
Content available remote

Retention, separation selectivity and system efficiency of selected basic psychotropic drugs on different RPLC columns

100%
Petruczynik A., Wróblewski K., Dzioba K., Waksmundzka-Hajnos M.
Open Chemistry
|
2015
|
vol. 13
|
issue 1
EN
Retention parameters of psychotropic drug standards were determined on different columns, i.e., Octadecyl silica, Phenyl, Phenyl-Hexyl, Polar Reverse Phase, Pentafluorophenyl, and Cyanopropyl using aqueous eluent systems containing methanol or acetonitrile as organic modifiers, acetate buffer at pH 3.5 and addition of silanol blocker − diethylamine (DEA). The retention, separation selectivity, and sequence of elution were different when using eluents containing various organic modifiers. The significant differences were observed in retention parameters with a change of the used stationary phase. The various properties of stationary phases resulted in differences in analyte retention, peaks shape, systems efficiency and separation selectivity. The best shape of peaks were on Cyanopropyl (CN) column and the highest efficiency for most investigated psychotropic drugs were obtained on Phenyl-Hexyl and Polar RP columns.
2
Content available remote

Retention behavior of selected alkaloids in Reversed Phase micellar chromatographic systems

100%
Petruczynik A., Noster G., Waksmundzka-Hajnos M.
Current Issues in Pharmacy and Medical Sciences
|
2015
|
vol. 28
|
issue 2
126-130
EN
In this work, the effects of sodium dodecyl sulfate (SDS) concentrations on retention, separation selectivity, peak shapes and systems efficiency were investigated. Herein, the retention data for 11 alkaloids were determined on an RP18 silica column with mobile phases containing methanol as organic modifier, with acetate buffer at pH 3.5, and, subsequently, with the addition of sodium dodecyl sulfate (SDS). The results of this study indicate that the retention of alkaloids decreases with the increase of SDS concentration in the mobile phase. The increase of SDS concentration, however, leads to the significantly improvement of peak symmetry and the increase of theoretical plate number in all cases. The best system efficiency for most of the investigated alkaloids was obtained in a mobile phase containing 0.1 M SDS, while most symmetrical peaks were obtained through the addition of 0.3 M of SDS to the mobile phase.
3
Content available remote

Radical scavenging activity of extruded corn gruels with addition of linden inflorescence

76%
Oniszczuk A., Oniszczuk T., Wójtowicz A., Wojtunik K., Kwaśniewska A., Waksmundzka-Hajnos M.
Open Chemistry
|
2015
|
vol. 13
|
issue 1
EN
Antioxidant activity is one of the most desirable properties of natural compounds. Among these substances are phenolic compounds which exhibit excellent antiradical activity. The main aim of the present study was determination of the free radical scavenging activity of gruels with 5, 10 and 20% addition of linden inflorescence. The studies were based on two methods: TLC-bioautographic assay and spectrophotometric analysis using DPPH (2,2-diphenyl-1-picrylhydrazyl radical). The obtained results indicate that the radical scavenging properties of the extracts are positively correlated with the content of phenolic compounds in gruels and that a high-temperature extrusion process does not deactivate antioxidant polyphenolic compounds.
4
Content available remote

GC-MS fingerprints of mint essential oils

64%
Hawrył M. A., Skalicka-Woźniak K., Świeboda R., Niemiec M., Stępak K., Waksmundzka-Hajnos M., Hawrył A., Szymczak G.
Open Chemistry
|
2015
|
vol. 13
|
issue 1
EN
Essential oils from eleven Mentha species were obtained by Deryng hydrodistillation and analysed by GC–MS: 44 compounds were identified. The most abundant were menthone, isomenthone, menthol, carvone, piperitone oxide, D-limonene and eucalyptol. Chemometric similarity measures and principal component analysis were calculated, allowing comparisons based on secondary metabolite content. The fingerprints may be helpful in chemotaxonomy.
first rewind previous Page / 1 next fast forward last
JavaScript is turned off in your web browser. Turn it on to take full advantage of this site, then refresh the page.