Determination of methylphenidate and its metabolite ritalinic acid in urine by liquid chromatography/tandem mass spectrometry

Strategies for the Assessment of Matrix Effect in Quantitative Bioanalytical Methods Based on HPLC−MS/MS

B.K. Matuszewski, M.L. Constanzer, C.M. Chavez-Eng · Analytical Chemistry · 2003 · 5.2K citations

Pharmacy, Pharmaceutical Analysis, Pharmacokinetics +17

Liquid chromatography–electrospray ionization mass spectrometry determination of methylphenidate and ritalinic acid in conventional and non-conventional biological matrices

Emilia Marchei, Manuela Pellegrini, Silvia Rossi et al. · Journal of Pharmaceutical and Biomedical Analysis · 2008 · 42 citations

Pharmacy, Pharmaceutical Analysis, Pharmacology +14

Urinary screening for methylphenidate (Ritalin) abuse: a comparison of liquid chromatography–tandem mass spectrometry, gas chromatography–mass spectrometry, and immunoassay methods

J. Eichhorst, Michele L. Etter, Joyce Lepage et al. · Clinical Biochemistry · 2003 · 40 citations

Pharmacy, Pharmacology, Psychiatry +13

Occurrence and fate of the human pharmaceutical metabolite ritalinic acid in the aquatic system

Marion Letzel, Walter Schüssler, Manfred Sengl · Chemosphere · 2010 · 38 citations

Pharmacy, Pharmacology, Toxicology +14

Liquid-chromatographic analysis for methylphenidate (Ritalin) in serum.

Steven J. Soldin, Barbara M. Hill, J. M. Swanson · Clinical Chemistry · 1979 · 26 citations

Pharmacy, Pharmaceutical Analysis, Pharmacology +17