Two-dimensional liquid chromatography with mixed mode stationary phases.

Area of Science:

• Analytical Chemistry
• Chromatography

Background:

• Mixed mode stationary phases incorporate ion-pairing reagents, offering unique selectivity for complex separations.
• These phases are crucial for multidimensional liquid chromatography, enabling enhanced resolution of analytes.

Purpose of the Study:

• To develop and evaluate a two-dimensional liquid chromatograph using coupled mixed mode stationary phases.
• To demonstrate the manipulation of separation selectivity by controlling mobile and stationary phase parameters.

Main Methods:

• Coupling of similar and dissimilar mixed mode stationary phases in a two-dimensional liquid chromatography system.
• Systematic variation of mobile phase composition (organic content, ionogenic modifier level) and stationary phase properties.

Main Results:

• Demonstrated that retention of hydrophobic and charged species can be independently controlled by mobile and stationary phase parameters.
• Achieved enhanced separation selectivity in the two-dimensional plane by optimizing chromatographic conditions.
• Showcased the potential for resolving co-eluting components due to complementary retention mechanisms.

Conclusions:

• Two-dimensional liquid chromatography with mixed mode stationary phases offers powerful capabilities for resolving complex mixtures.
• The technique allows for fine-tuning of selectivity, leading to improved analytical performance.
• Current limitations restrict the method to qualitative analysis due to partial eluent transfer to the secondary column.