Comparison of chiral electrophoretic separation methods for phenethylamines and application on impurity analysis

Area of Science:

• Analytical Chemistry
• Chromatography
• Chiral Separations

Background:

• Chiral separation of phenethylamines is crucial for pharmaceutical quality control.
• Existing methods like capillary zone electrophoresis (CZE) have limitations.
• Development of novel, efficient chiral separation techniques is needed.

Purpose of the Study:

• To develop and validate a chiral microemulsion electrokinetic chromatography (MEEK) method.
• To separate enantiomers of several key phenethylamine compounds.
• To apply the method for related substances analysis in pharmaceutical contexts.

Main Methods:

• Utilized an oil-in-water microemulsion system (ethyl acetate, sodium dodecyl sulfate, 1-butanol, propan-2-ol, phosphate buffer pH 2.5).
• Incorporated sulfated beta-cyclodextrin as the chiral selector for enantioseparation.
• Compared the developed MEEK method with a previously established CZE method using heptakis(2,3-di-O-diacetyl-6-O-sulfo)-beta-cyclodextrin (HDAS).

Main Results:

• Successfully separated enantiomers of ephedrine, N-methylephedrine, norephedrine, pseudoephedrine, adrenaline (epinephrine), 2-amino-1-phenylethanol, diethylnorephedrine, and 2-(dibutylamino)-1-phenyl-1-propanol.
• The developed MEEK method demonstrated efficacy in enantioseparation.
• The method was successfully applied to the analysis of related substances for noradrenaline, adrenaline, dipivefrine, ephedrine, and pseudoephedrine.

Conclusions:

• The developed chiral MEEK method is effective for enantiomeric separation of phenethylamines.
• This method provides a viable alternative for pharmaceutical analysis, including related substances testing.
• The study highlights the utility of microemulsion electrokinetic chromatography in chiral drug analysis.