
An unexpected retention order for ketamine analogs was observed when using a biphenyl stationary phase for liquid chromatography-mass spectrometry (LC–MS).
Åse Marit Leere Øiestad is a senior scientist at Oslo University Hospital. Her research interests include analytical forensic toxicology, development of analytical methods with mass spectrometric techniques, new psychoactive substances, and post-mortem toxicology.

An unexpected retention order for ketamine analogs was observed when using a biphenyl stationary phase for liquid chromatography-mass spectrometry (LC–MS).