
An unexpected retention order for ketamine analogs was observed when using a biphenyl stationary phase for liquid chromatography-mass spectrometry (LC–MS).
Line Noreng is a Master's student in bioanalytical chemistry at the Department of Chemistry, University of Oslo (Norway). She conducted her Master's project on ketamine analogs at Oslo University Hospital.

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