Niklas Tyrefors

Determination of morphine, morphine-3-glucuronide and morphine-6-glucuronide in human serum by solid-phase extraction and liquid chromatography-mass spectrometry with electrospray ionisation

Niklas Tyrefors, Benita Hyllbrant, Lena Ekman et al. · Journal of Chromatography A · 1996 · 95 citations

Medicine, Liquid Chromatography-mass Spectrometry, Bioanalysis +10

Determination of fentanyl in human plasma and fentanyl and norfentanyl in human urine using LC–MS/MS

Nt Huynh, Niklas Tyrefors, L. Ekman et al. · Journal of Pharmaceutical and Biomedical Analysis · 2004 · 71 citations

Human Urine, Medicine, Drug Purity +10

High-performance liquid chromatography–tandem electrospray mass spectrometry for the determination of lidocaine and its metabolites in human plasma and urine

Mohamed Abdel‐Rehim, Margareta Bielenstein, Yvonne Askemark et al. · Journal of Chromatography B Biomedical Sciences and Applications · 2000 · 70 citations

Biochemistry, Medicine, Bioanalysis +10

Temporal lobe epilepsy visualized with PET with 11 C-L-deuterium-deprenyl - analysis of kinetic data

Mats Bergström, Eva Kumlien, Anders Lilja et al. · Acta Neurologica Scandinavica · 1998 · 47 citations

Trace analysis of fluoxetine and its metabolite norfluoxetine. Part I: Development of a chiral liquid chromatography–tandem mass spectrometry method for wastewater samples

Victoria K.H. Barclay, Niklas Tyrefors, Ingvar Johansson et al. · Journal of Chromatography A · 2011 · 44 citations

Engineering, Chemical Contaminant, Wastewater Treatment +16