title: DryLab® optimised two-dimensional high performance liquid chromatography for differentiation of ephedrine and pseudoephedrine based methamphetamine samples.
abstract: In-silico optimised two-dimensional high performance liquid chromatographic (2D-HPLC) separations of a model methamphetamine seizure sample are described, where an excellent match between simulated and real separations was observed. Targeted separation of model compounds was completed with significantly reduced method development time. This separation was completed in the heart-cutting mode of 2D-HPLC where C18 columns were used in both dimensions taking advantage of the selectivity difference of methanol and acetonitrile as the mobile phases. This method development protocol is most significant when optimising the separation of chemically similar chemical compounds as it eliminates potentially hours of trial and error injections to identify the optimised experimental conditions. After only four screening injections the gradient profile for both 2D-HPLC dimensions could be optimised via simulations, ensuring the baseline resolution of diastereomers (ephedrine and pseudoephedrine) in 9.7 min. Depending on which diastereomer is present the potential synthetic pathway can be categorized.
authors.affiliation: Centre For Chemistry and Biotechnology, School of Life and Environmental Sciences Deakin University, Geelong 3216, Australia.
authors.forename: Luke M
authors.initials: LM
authors.lastname: Andrighetto
authors.forename: Paul G
authors.initials: PG
authors.lastname: Stevenson
authors.forename: James R
authors.initials: JR
authors.lastname: Pearson
authors.forename: Luke C
authors.initials: LC
authors.lastname: Henderson
authors.forename: Xavier A
authors.initials: XA
authors.lastname: Conlan
mesh_terms: D000697:Central Nervous System Stimulants / Q000737:chemistry*; D002853:Chromatography, Liquid / Q000379:methods*; D004340:Drug Contamination; D004809:Ephedrine / Q000032:analysis*; D053593:Forensic Toxicology; D008694:Methamphetamine / Q000737:chemistry*; D054199:Pseudoephedrine / Q000032:analysis*; D012984:Software
chemical_list: D000697:Central Nervous System Stimulants; D008694:Methamphetamine; D054199:Pseudoephedrine; D004809:Ephedrine