Papers by marzanna kurzawa
Materials, Oct 20, 2022
This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
Cosmetics, Aug 2, 2022
This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
Materials, Oct 20, 2022
This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
Current Issues in Pharmacy and Medical Sciences, Jul 1, 2012
A sen si tive and re pro duci ble chro ma tographic method was de vel oped and vali dated for the... more A sen si tive and re pro duci ble chro ma tographic method was de vel oped and vali dated for the quan ti fi ca tion of doxycy cline hy drochlo ride in vet eri nary prod uct-Doxycy clinum 50%. The analy sis was per formed on HPLC (Shi madzu) ap pa ra tus with di ode ar ray de tec tor. The sepa ra tion was pro vided with C18 col umn (4.6mm×100 mm, 3 μm par ti cle size) at mo bile phase flow rate 1ml/min and de tec tion at 254 nm. The method was tested in the range 50-150% nomi nal DOXY con cen tra tion re sult ing good line ar ity with cor re la tion co ef fi cient r=0.9999. The es ti mated LOD and LOQ elabo rated method amounted to 0.46 and 1.55 mg/L. The re cov ery val ues were from 99.70 to 100.9% with RSD 0.78%. It was con firmed that the rea gents used for test ing of sam ples and sol vents do not in ter fere with the ac tive sub stance. Moreo ver, the sig nifi cant in flu ence of tem pera ture and flow rate on the re ten tion time was as cer tained. The car ried out re search dem on strates that the method is vali dated and the ob tained re sults are ac cu rate and re produci ble. The elabo rated method can be suit able to rou tine analy sis in qual ity con trol labo ra tory.
Cosmetics, Aug 2, 2022
This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
Cosmetics, Dec 5, 2022
This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
Current Issues in Pharmacy and Medical Sciences, Jul 1, 2012
A sen si tive and re pro duci ble chro ma tographic method was de vel oped and vali dated for the... more A sen si tive and re pro duci ble chro ma tographic method was de vel oped and vali dated for the quan ti fi ca tion of doxycy cline hy drochlo ride in vet eri nary prod uct-Doxycy clinum 50%. The analy sis was per formed on HPLC (Shi madzu) ap pa ra tus with di ode ar ray de tec tor. The sepa ra tion was pro vided with C18 col umn (4.6mm×100 mm, 3 μm par ti cle size) at mo bile phase flow rate 1ml/min and de tec tion at 254 nm. The method was tested in the range 50-150% nomi nal DOXY con cen tra tion re sult ing good line ar ity with cor re la tion co ef fi cient r=0.9999. The es ti mated LOD and LOQ elabo rated method amounted to 0.46 and 1.55 mg/L. The re cov ery val ues were from 99.70 to 100.9% with RSD 0.78%. It was con firmed that the rea gents used for test ing of sam ples and sol vents do not in ter fere with the ac tive sub stance. Moreo ver, the sig nifi cant in flu ence of tem pera ture and flow rate on the re ten tion time was as cer tained. The car ried out re search dem on strates that the method is vali dated and the ob tained re sults are ac cu rate and re produci ble. The elabo rated method can be suit able to rou tine analy sis in qual ity con trol labo ra tory.
European Food Research and Technology, Feb 25, 2016
Anti-nutritional components such as: oxalates, thiocyanates and phytic acid were determined in 20... more Anti-nutritional components such as: oxalates, thiocyanates and phytic acid were determined in 20 plants samples originated from Traditional Chinese Medicine and Ayurveda (e.g.,
Cosmetics, Dec 5, 2022
This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
Pharmaceutica Analytica Acta, 2012
A capillary isotachophoretic method (cITP) using three electrolyte systems for determination of p... more A capillary isotachophoretic method (cITP) using three electrolyte systems for determination of promethazine, thioridazine and chlorpromazine hydrochlorides in pharmaceutical preparations was demonstrated. Proposed systems were characterised by linearity range 5-100 mg/L with R 2 in all cases were higher than 0.999. The elaborated method was tested on pharmaceutical preparations. The recovery values were from 96.5% to 101.3%. The proposed isotachophoretic method is simple with acceptable precision and accuracy and can be suitable for routine analysis of studied biological active compounds.
European Food Research and Technology, Feb 25, 2016
Anti-nutritional components such as: oxalates, thiocyanates and phytic acid were determined in 20... more Anti-nutritional components such as: oxalates, thiocyanates and phytic acid were determined in 20 plants samples originated from Traditional Chinese Medicine and Ayurveda (e.g.,
Materials, Feb 9, 2023
This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
Materials, Feb 9, 2023
This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
Synthetic Metals, May 1, 1995
The aim of this work was to determine the effects of substituting the thiophene aromatic hydrogen... more The aim of this work was to determine the effects of substituting the thiophene aromatic hydrogen atom in the 4-position in poly(3-alkylthiophene) (P3AT) by a nitro group (-N02) , Or by a chlorine atom (-CI) in a highly dispersed state of polymer. The feature of such substituted polymers is lower conductivity in comparison with the initial polymer. Modified P3ATs remain semiconducting in character. The nitration and chlorination of P3ATs take place mainly in the 4-position of the thiophene ring. The rates of both processes increase with an increase in the chain length of the alkyl side group.
Polyhedron, 2018
Au(III) chloride compounds with 7,8-benzoquinoline (bqn)-[Au(bqn)Cl 3 ] and [Au(bqn*)Cl 2 ] (bqn*... more Au(III) chloride compounds with 7,8-benzoquinoline (bqn)-[Au(bqn)Cl 3 ] and [Au(bqn*)Cl 2 ] (bqn* being deprotonated, at the C(10) carbon, monoanionic form of bqn) were studied by 1 H-13 C, 1 H-15 N HMQC and HMBC-NMR. 1 H, 13 C and 15 N coordination shifts were discussed in relation to the molecular structures, revealing characteristic variability patterns. Analogous NMR measurements were performed for the new (bqnH +) 2 (AuCl 4-)Clsalt, studied also by single crystal X-ray diffraction. All compounds exhibited fluorescence.
Polyhedron, 2018
Au(III) chloride compounds with 7,8-benzoquinoline (bqn)-[Au(bqn)Cl 3 ] and [Au(bqn*)Cl 2 ] (bqn*... more Au(III) chloride compounds with 7,8-benzoquinoline (bqn)-[Au(bqn)Cl 3 ] and [Au(bqn*)Cl 2 ] (bqn* being deprotonated, at the C(10) carbon, monoanionic form of bqn) were studied by 1 H-13 C, 1 H-15 N HMQC and HMBC-NMR. 1 H, 13 C and 15 N coordination shifts were discussed in relation to the molecular structures, revealing characteristic variability patterns. Analogous NMR measurements were performed for the new (bqnH +) 2 (AuCl 4-)Clsalt, studied also by single crystal X-ray diffraction. All compounds exhibited fluorescence.
Chemical Papers, Dec 9, 2016
Mycotoxins and selected hazardous alkaloids in the medicinal plants (Panax ginseng, Angelica sine... more Mycotoxins and selected hazardous alkaloids in the medicinal plants (Panax ginseng, Angelica sinensis, and Withania somnifera) and dietary supplements were determined. Purine alkaloids were found in majority of samples; however, isoquinoline alkaloids were less abundant than indole. The predominant alkaloids appear to be caffeine (purine group), harman (indole group) and berberine (isoquinoline). Examined medicinal plants and dietary supplements were contaminated by mycotoxins (especially ochratoxin A 1.72-5.83 lg kg-1), and many species of mold (e.g. Cladosporium, Eurotium, Aspergillus, Rhizopus, Penicillium). MTT cytotoxicity tests revealed that plant and supplements extracts exhibited medium or high cytotoxicity (only Dong quai-low). Moreover, antioxidant activity, total phenolics content and selected phytochemicals were analyzed by spectrophotometric and chromatographic methods. Quercetin and rutin were predominant flavonols (1.94-9.51 and 2.20-7.28 mg 100 g-1 , respectively). Analysis of phenolic acids revealed-gallic acid, as the most abundant, except Panax ginseng, where ferulic acid was prevailing. The results were analyzed by chemometric methods (cluster analysis, ANOVA).
Chemical Papers, Dec 9, 2016
Mycotoxins and selected hazardous alkaloids in the medicinal plants (Panax ginseng, Angelica sine... more Mycotoxins and selected hazardous alkaloids in the medicinal plants (Panax ginseng, Angelica sinensis, and Withania somnifera) and dietary supplements were determined. Purine alkaloids were found in majority of samples; however, isoquinoline alkaloids were less abundant than indole. The predominant alkaloids appear to be caffeine (purine group), harman (indole group) and berberine (isoquinoline). Examined medicinal plants and dietary supplements were contaminated by mycotoxins (especially ochratoxin A 1.72-5.83 lg kg-1), and many species of mold (e.g. Cladosporium, Eurotium, Aspergillus, Rhizopus, Penicillium). MTT cytotoxicity tests revealed that plant and supplements extracts exhibited medium or high cytotoxicity (only Dong quai-low). Moreover, antioxidant activity, total phenolics content and selected phytochemicals were analyzed by spectrophotometric and chromatographic methods. Quercetin and rutin were predominant flavonols (1.94-9.51 and 2.20-7.28 mg 100 g-1 , respectively). Analysis of phenolic acids revealed-gallic acid, as the most abundant, except Panax ginseng, where ferulic acid was prevailing. The results were analyzed by chemometric methods (cluster analysis, ANOVA).
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Papers by marzanna kurzawa