Determination of clostebol residues in the urine of slaughter animals using liquid chromatography–tandem mass spectrometry
Iwona Matraszek-Żuchowska, Alicja Kłopot, Justyna Grzelak, Paulina Zdonek
Natural Occurrence of Thiouracil in Urine of Livestock in Poland
Barbara Woźniak, Sebastian Witek, Jan Żmudzki, Alicja Kłopot
Liquid chromatographytandem mass spectrometry methods for determination of stanozolol and l6β-hydroxy-stanozolol in animal urine
Iwona Matraszek-Źuchowska, Alicja Kłopot, Katarzyna Sielska, Beata Korycińska, Sebastian Witek, Paulina Zdonek, Piotr Jedziniak
Control of anabolic hormone residues in tissues of slaughter animals in Poland during the period of 2011–2015
Iwona Matraszek-Żuchowska, Barbara Woźniak, Alicja Kłopot, Sebastian Witek, Katarzyna Sielska, Andrzej Posyniak
Determination of natural and synthetic oestrogens in surface water using gas chromatography-mass spectrometry
Barbara Woźniak, Alicja Kłopot, Iwona Matraszek-Żuchowska, Katarzyna Sielska, Jan Żmudzki
Determination of natural progesterone levels in bovine serum using gas chromatography coupled with mass spectrometry
Iwona Matraszek-Żuchowska, Alicja Kłopot, Paulina Zdonek, Beata Korycińska, Justyna Grzelak
Screening and confirmatory GC-MS methods for the detection of trenbolone in bovine urine
Barbara Woźniak, Iwona Matraszek-Żuchowska, Stanisław Semeniuk, Alicja Kłopot, Jan Żmudzki
Levels of the natural hormones 17β-oestradiol and testosterone in serum of cattle: results from population studies in Poland
Barbara Woźniak, Sebastian Witek, Iwona Matraszek-Żuchowska, Alicja Kłopot, Andrzej Posyniak