Nikolai Stephanson

Ecstasy Analogues Found in Cacti

O. Beck, A. Shulgin, Hesham R Ei-Seedi, 2008, Journal of psychoactive drugs.

Comparison of urinary excretion characteristics of ethanol and ethyl glucuronide.

A. Helander, O. Beck, H. Dahl, 2002, Journal of analytical toxicology.

Accurate identification and quantification of 11-nor-delta(9)-tetrahydrocannabinol-9-carboxylic acid in urine drug testing: evaluation of a direct high efficiency liquid chromatographic-mass spectrometric method.

R. Kronstrand, O. Beck, M. Josefsson, 2008, Journal of chromatography. B, Analytical technologies in the biomedical and life sciences.

Validation of direct injection electrospray LC-MS/MS for confirmation of opiates in urine drug testing.

O. Beck, N. Stephanson, M. Andersson, 2007, Journal of mass spectrometry : JMS.

Direct injection LC-MS/MS method for identification and quantification of amphetamine, methamphetamine, 3,4-methylenedioxyamphetamine and 3,4-methylenedioxymethamphetamine in urine drug testing.

O. Beck, N. Stephanson, M. Andersson, 2008, Journal of chromatography. B, Analytical technologies in the biomedical and life sciences.

Direct and efficient liquid chromatographic-tandem mass spectrometric method for opiates in urine drug testing - importance of 6-acetylmorphine and reduction of analytes.

Olof Beck, J. Lindh, O. Beck, 2014, Drug testing and analysis.