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: 5

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

Search results

Search:
in the keywords:  LC-MS
help Sort By:

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

Kinetics and mechanism of solid state imidapril hydrochloride degradation and its degradation impurities identification

100%
Regulska K., Stanisz B.
Open Chemistry
|
2013
|
vol. 11
|
issue 5
754-762
EN
A detailed stability testing of solid state imidapril hydrochloride (IMD) was performed and its degradation products were identified. The analysis was conducted according to ICH guidelines Q1A(R2). Pure IMD samples were exposed to stress conditions of elevated temperature and relative humidity (T = 363 K, RH = 76.4%) in order to accelerate degradation. The regular loss of IMD content with time, and the formation of two degradation impurities were observed. The appropriate reaction rate constants k (for IMD degradation and for the formation of product I and II) were calculated using Prout-Tompkins equation. The obtained degradation products were separated and identified by means of LC-MS technique. Based on the obtained m/z values, the masses and the structures of the formed degradation impurities were established. Also IMD degradation scheme was constructed. It was demonstrated that under the applied analytical conditions, IMD degradation follows an autocatalytic reaction model with the rate constant k = (4.764 ± 0.34)×10 −6 s −1 and with the parallel formation of two degradation products: imidaprilat and the diketopiperazine derivative. The obtained experimental results are in agreement with IMD degradation pathways proposed theoretically. [...]
2
Content available remote

Analytical methods to differentiate Romanian amber and Baltic amber for archaeological applications

100%
Teodor E., Liţescu S., Neacşu A., Truică G., Albu C.
Open Chemistry
|
2009
|
vol. 7
|
issue 3
560-568
EN
The study aims to establish several definite criteria which will differentiate Romanian amber and Baltic amber to certify the local or Baltic origin of the materials found in archaeological sites on the Romanian territory, by using light microscopy and performing analytical methods, such as Fourier transform infrared spectroscopy-variable angle reflectance and liquid chromatography with mass spectrometry detection. Experiments especially by Fourier transformed infrared spectroscopy, were applied to a wide range of samples with controlled origin. The methods were optimised and resulted in premises to apply the techniques to analysis of the archaeological material. [...]
3
Publication available in full text mode
Content available

Mass Spectrometric Detection of New Betalains in Mammillaria Flowers

88%
Szot D., Starzak K., Skopińska A., Wybraniec S.
Zeszyty Naukowe Towarzystwa Doktorantów Uniwersytetu Jagiellońskiego. Nauki Ścisłe
|
2015
|
issue 10
189-196
EN
Betacyanins are natural, red-violet betalain pigments which can be found in plenty of plants of the Cactaceae family. The Mammillaria is the widest genus of the Cactaceae family of which fruit was examined for betacyanins contents. As a result of the investigation, a new pigment structure, mammillarinin, was identified. Heretofore, no betacyanins of Mammillaria coronata flowers has been extensively studied. In this report, the results of betacyanin analysis by LC-DAD-ESI-MS/MS in the flower extract are presented.
4
Publication available in full text mode
Content available

Comparison of Phenolic Profile and In Vitro Antioxidant Capacity of Sorbus domestica L. Leaf Samples from Poland and Croatia

75%
Rutkowska M., Dubicka M., Olszewska M. A.
Acta Biologica Cracoviensia s. Botanica
|
2019
|
vol. 61
|
issue 1
5
Publication available in full text mode
Content available

REDUCTION OF SELECTED BETACYANINS

75%
SZOT D., STARZAK K., SKOPIŃSKA A., WYBRANIEC S.
Zeszyty Naukowe Towarzystwa Doktorantów Uniwersytetu Jagiellońskiego. Nauki Ścisłe
|
2014
|
issue 8
265-273
EN
Betacyanins are conjugates of betalamic acid and glycosylated cyclo-DOPA which bring about the creation of a specific chromophoric system, the 1,7-dia- zaheptamethin chain. Betanin, a betacyanin pigment from red beet (Beta vulga- ris L.), as well as its decarboxylated derivatives were subjected to reduction with the use of NaBH4. The pigment structures contain a vinyl linker which is postu- lated to be protonated during reaction with NaBH4. In this study, 17-decarboxy- betanin and 2,17-bidecarboxy-betanin were obtained from betanin, which had been previously isolated from red beet root (Beta vulgaris L.). Purified pigments were tested in the presence of the reduction reagent while looking for the prod- ucts of the reaction identified by LC-MS.
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.