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Jan Krzek

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TOP 3
Urszula Hubicka; Maciej Pawłowski; Pawel Zajdel; Paweł Zmudzki; Barbara Zuromska-Witek; Jan Krzek
Separation and characterization of ciprofloxacin, difloxacin, lomefloxacin, norfloxacin, and ofloxacin oxidation products under potassium permanganate treatment in acidic medium by UPLC-MS/MS.
Urszula Hubicka; Jan Krzek; Maria Walczak; Barbara Zuromska-Witek; Marek Zylewski
Kinetic and thermodynamic studies of moxifloxacin hydrolysis in the presence and absence of metal ions in acidic solutions.
Anna Kwiecień; Jan Krzek; Maria Walczak
Stress degradation studies on azithromycin and development of a validated stability-indicating TLC-densitometric method with HPLC/electrospray ionization-MS analysis of degradation products.

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All Publications

2013: Urszula Hubicka; Maciej Pawłowski; Pawel Zajdel; Paweł Zmudzki; Barbara Zuromska-Witek; Jan Krzek
Separation and characterization of ciprofloxacin, difloxacin, lomefloxacin, norfloxacin, and ofloxacin oxidation products under potassium permanganate treatment in acidic medium by UPLC-MS/MS.
Talanta 2013;109():91-100.
2013: Urszula Hubicka; Jan Krzek; Maria Walczak; Barbara Zuromska-Witek; Marek Zylewski
Kinetic and thermodynamic studies of moxifloxacin hydrolysis in the presence and absence of metal ions in acidic solutions.
Acta poloniae pharmaceutica 2013;70(1):59-70.
2012: Anna Kwiecień; Jan Krzek; Maria Walczak
Stress degradation studies on azithromycin and development of a validated stability-indicating TLC-densitometric method with HPLC/electrospray ionization-MS analysis of degradation products.
Journal of AOAC International 2012;95(5):1418-24.
2012: Urszula Hubicka; Jan Krzek; Maria Walczak; Barbara Zuromska-Witek; Marek Zylewski
Kinetic and thermodynamic studies of moxifloxacin hydrolysis in the presence and absence of metal ions in acidic solutions.
Acta poloniae pharmaceutica 2012;69(5):821-31.
2012: Anna Kierszniewska; Jan Krzek
Determination of Se(IV), Cd(II) and Pb(II) ions in homeopathic drugs by inversion voltammetry method.
Acta poloniae pharmaceutica 2012;69(4):611-6.
2012: Malgorzata Starek; Jan Krzek
TLC determination of meloxicam in tablets and after acidic and alkaline hydrolysis.
Acta poloniae pharmaceutica 2012;69(2):225-35.
2012: Urszula Hubicka; Jan Krzek; Maria Walczak; Barbara Żuromska; Marek Żylewski; Daniel Pawłowski
Determination of photostability and photodegradation products of moxifloxacin in the presence of metal ions in solutions and solid phase. Kinetics and identification of photoproducts.
Photochemical & photobiological sciences : Official journal of the European Photochemistry Association and the European Society for Photobiology 2012;11(2):351-7.
2011: Anna Maślanka; Mariusz Stolarczyk; Maria Walczak; Jan Krzek; Agata Głogowska
Stability studies of clonazepam, diazepam, haloperidol, and doxepin with diverse polarities in an acidic environment.
Journal of AOAC International 2011;94(6):1791-9.
2011: Jan Krzek; Joanna Piotrowska
Spectrophotometric determination of bacitracin in bulk drug as dabsyl derivative in a range of visible light.
Acta poloniae pharmaceutica 2011;68(6):853-8.
2010: Malgorzata Starek; Jan Krzek
TLC chromatographic-densitometric assay of ibuprofen and its impurities.
Journal of chromatographic science 2010;48(10):825-9.
2010: R J Ekiert; Jan Krzek; P Talik
Chromatographic and electrophoretic techniques used in the analysis of triazole antifungal agents-a review.
Talanta 2010;82(4):1090-100.
2010: Anna Kwiecień; Urszula Hubicka; Jan Krzek
Determination of retinyl palmitate in ointment by HPLC with diode array detection.
Acta poloniae pharmaceutica 2010;67(5):475-9.
2010: Mariusz Stolarczyk; Anna Maślanka; Anna Apola; Jan Krzek
Analysis of hypotensive compounds occurring in complex agents.
Acta poloniae pharmaceutica 2010;67(5):441-54.
2010: Urszula Hubicka; Jan Krzek; Maria Walczak
Stability of ciprofloxacin and norfloxacin in the presence and absence of metal ions in acidic solution.
Pharmaceutical development and technology 2010;15(5):532-44.
2010: Monika Dabrowska; Jan Krzek
Chiral separation of diastereoisomers of cefuroxime axetil by high-performance thin-layer chromatography.
Journal of AOAC International 2010;93(3):771-7.
2010: Jan Krzek; Joseph Sherma
New planar chromatography-densitometry methods for determination of drug substances and formulations.
Journal of AOAC International 2010;93(3):751-3.
2009: Joanna Gdula-Argasińska; Urszula Hubicka; Jan Krzek; Małgorzata Tyszka-Czochara; Jerzy Jaśkiewicz
Development and validation of GC-FID method for the determination of ethanol residue in marjoram ointment.
Acta poloniae pharmaceutica 2009;66(6):611-5.
2009: Anna Maślanka; Jan Krzek; Aleksander Patrzałek
Determination of risperidone in tablets in the presence of its degradation products and placebo-derived constituents.
Acta poloniae pharmaceutica 2009;66(5):461-70.
2009: Urszula Hubicka; Jan Krzek; Hanna Woltyńska; Bozena Stachacz
Simultaneous identification and quantitative determination of selected aminoglycoside antibiotics by thin-layer chromatography and densitometry.
Journal of AOAC International 2009;92(4):1068-75.
2009: Mariusz Stolarczyk; Anna Apola; Jan Krzek; Anna Sajdak
Validation of derivative spectrophotometry method for determination of active ingredients from neuroleptics in pharmaceutical preparations.
Acta poloniae pharmaceutica 2009;66(4):351-6.
2009: Malgorzata Starek; Jan Krzek
A review of analytical techniques for determination of oxicams, nimesulide and nabumetone.
Talanta 2009;77(3):925-42.
2008: Urszula Hubicka; Jan Krzek
Effect of selected metal ions on the photodegradation of ciprofloxacin in the solid phase.
Journal of AOAC International 2008;91(6):1331-8.
2008: Urszula Hubicka; Jan Krzek; Justyna Luka
Thin-layer chromatography-densitometric measurements for determination of N-(hydroxymethyl)nicotinamide in tablets and stability evaluation in solutions.
Journal of AOAC International 2008;91(5):1186-90.
2008: Mariusz Stolarczyk; Anna Apola; Jan Krzek; Katarzyna Lech
Simultaneous determination of triamterene and hydrochlorothiazide in tablets using derivative spectrophotometry.
Acta poloniae pharmaceutica 2008;65(3):283-7.
2008: Mariusz Stolarczyk; Anna Maślanka; Jan Krzek; Joanna Milczarek
Application of derivative spectrophotometry for determination of enalapril, hydrochlorothiazide and walsartan in complex pharmaceutical preparations.
Acta poloniae pharmaceutica 2008;65(3):275-81.
2008: Anna Kwiecień; Jan Krzek; Marek Zylewski
Stability of chosen beta-adrenolytic drugs of different polarity in basic environment.
Journal of AOAC International 2008;91(2):322-31.
2007: Jan Krzek; Janusz Slawomir Czekaj; Wlodzimierz Rzeszutko; Radosław J Ekiert
Validation of capillary gas chromatographic method for determination of bilobalide and ginkgolides A, B, C in Ginkgo biloba dry and liquid extracts.
Acta poloniae pharmaceutica 2007;64(4):303-10.
2007: Jan Krzek; Anna Apola; Mariusz Stolarczyk; Wlodzimierz Rzeszutko
Spectrophotometric determination of Pb(II), Fe(III) and Bi(III) in complexes with 1,2-diaminocyclohexane-N,N,N',N'-tetraacetic acid (DACT).
Acta poloniae pharmaceutica 2007;64(1):3-8.
2006: Mariusz Stolarczyk; Radosław Ekiert; Jan Krzek; Wlodzimierz Rzeszutko
Determination of metoprolol and hydrochlorothiazide by derivative spectrophotometric method in pharmaceutical preparations.
Acta poloniae pharmaceutica 2006;63(3):169-73.
2006: Jan Krzek; Jolanta Kaleta; Urszula Hubicka; Aneta Niedzwiedz
Reversed-phase high-performance liquid chromatography determination of selected phenolic acids in propolis concentrates in terms of standardization for drug manufacturing purposes.
Journal of AOAC International 2006;89(2):352-8.
2006: Jan Krzek; Anna Kwiecień; Marek Zylewski
Stability of atenolol, acebutolol and propranolol in acidic environment depending on its diversified polarity.
Pharmaceutical development and technology 2006;11(4):409-16.
2005: Jan Krzek; Anna Maślanka; Pawel Lipner
Identification and quantitation of polymyxin B, framycetin, and dexamethasone in an ointment by using thin-layer chromatography with densitometry.
Journal of AOAC International 2005;88(5):1549-54.
2005: Jan Krzek; Urszula Hubicka; Justyna Szczepańiczyk
High-performance thin-layer chromatography with densitometry for the determination of ciprofloxacin and impurities in drugs.
Journal of AOAC International 2005;88(5):1530-6.
2005: Anna Maślanka; Jan Krzek
Densitometric high performance thin-layer chromatography identification and quantitative analysis of psychotropic drugs.
Journal of AOAC International 2005;88(1):70-9.
2004: Jan Krzek; Malgorzata Starek
Quality assessment for tramadol in pharmaceutical preparations with thin layer chromatography and densitometry.
Biomedical chromatography : BMC 2004;18(8):589-99.
2004: Mariusz Stolarczyk; Jan Krzek; Wlodzimierz Rzeszutko
Application of derivative spectrophotometry to simultaneous determination of indomethacin and 5-methoxy-2-methyl-3-indoleacetic acid in metindol injections.
Journal of AOAC International 2004;87(3):592-5.
2004: Jan Krzek; Janusz Slawomir Czekaj; Wlodzimierz Rzeszutko; Anna Jończyk
Direct separation, identification and quantification of epimers 22R and 22S of budesonide by capillary gas chromatography on a short analytical column with Rtx-5 stationary phase.
Journal of chromatography. B, Analytical technologies in the biomedical and life sciences 2004;803(2):191-200.
2004: Wlodzimierz Opoka; Jan Krzek; Anna Kierszniewska; Wlodzimierz Rzeszutko
Direct determination of Pb(II) and Cd(II) ions as impurities in some homeopathic drugs by using stripping voltammetry.
Acta poloniae pharmaceutica 2004;61(1):3-7.
2003: Jan Krzek; Maria Moniczewska; Grazyna Zabierowska-Slusarczyk
The HPLC determination of propane-1,2,3-triyl trinitrite and impurities: (2RS)-3-hydroxypropane-1,2-diyl dinitrate and 2-hydroxypropane-1,3-diyl dinitrate in ointment.
Journal of pharmaceutical and biomedical analysis 2003;33(3):403-9.
2003: Jan Krzek; Janusz Slawomir Czekaj; Wlodzimierz Rzeszutko
Validation of a method for simultaneous determination of menthol and methyl salicylate in pharmaceuticals by capillary gas chromatography with cool on-column injection.
Acta poloniae pharmaceutica 2003;60(5):343-9.
2002: Jan Krzek; Malgorzata Starek
Densitometric determination of diclofenac, 1-(2,6-dichlorophenyl)indolin-2-one and indolin-2-one in pharmaceutical preparations and model solutions.
Journal of pharmaceutical and biomedical analysis 2002;28(2):227-43.
2001: Zbigniew Janeczko; Jan Krzek; N Pilewski; D Walusiak
Densitometric analysis of kawain in kava-kava root extracts.
Acta poloniae pharmaceutica 2001;58(6):463-8.
2001: Jan Krzek; Malgorzata Starek
Simultaneous densitometric determination of indomethacin and its degradation products, 4-chlorobenzoic acid and 5-methoxy-2-methyl-3-indoleacetic acid, in pharmaceutical preparations.
Journal of AOAC International 2001;84(6):1703-7.
2001: Jan Krzek; Janusz Slawomir Czekaj; M Moniczewska; Wlodzimierz Rzeszutko
Determination of gliclazide in pharmaceutical preparations by capillary gas chromatography with cool on-column injection and elimination of the matrix effect.
Journal of AOAC International 2001;84(6):1695-702.
2001: Jan Krzek; Malgorzata Starek; A Kwiecień; Wlodzimierz Rzeszutko
Simultaneous identification and quantitative determination of neomycin sulfate, polymixin B sulfate, zinc bacytracin and methyl and propyl hydroxybenzoates in ophthalmic ointment by TLC.
Journal of pharmaceutical and biomedical analysis 2001;24(4):629-36.
2000: Jan Krzek; A Kwiecień; Malgorzata Starek; A Kierszniewska; Wlodzimierz Rzeszutko
Identification and determination of oxytetracycline, tiamulin, lincomycin, and spectinomycin in veterinary preparations by thin-layer chromatography/densitometry.
Journal of AOAC International 2000;83(6):1502-6.
2000: Jan Krzek; A Maślanka
Densitometric determination of impurities in pharmaceuticals. Part VI. Determination of 4,4-bis[4-(p-chlorophenyl)- 4-hydroxypiperidino]butyrophenone in haloperidol.
Acta poloniae pharmaceutica 2000;57(1):23-6.
1999: Jan Krzek; A Kwiecień
Densitometric determination of impurities in drugs: Part IV. Determination of N-(4-aminobenzoyl)-L-glutamic acid in preparations of folic acid.
Journal of pharmaceutical and biomedical analysis 1999;21(2):451-7.