Rapid separations by LC using ion-exchange media based on spongy monoliths

Area of Science:

• Materials Science
• Analytical Chemistry
• Separation Science

Background:

• Developing efficient materials for separating and concentrating ionic solutes is crucial in analytical chemistry.
• Existing methods may face limitations in speed and efficiency, particularly at higher flow rates.

Purpose of the Study:

• To develop novel sponge-based monoliths with ionic functional groups for rapid separation and concentration of ionic solutes.
• To evaluate the performance of these ionic spongy monoliths in liquid chromatography and online solid-phase extraction.

Main Methods:

• Preparation of cationic and anionic spongy monoliths via chemical modification of poly(ethylene-co-vinyl acetate) spongy monoliths.
• Hydrolysis followed by introduction of anionic (succinyl chloride) or cationic (acryloyl chloride/diethylamine) moieties.
• Liquid chromatographic evaluations and column-switching LC with online SPE.

Main Results:

• Both anionic and cationic spongy monoliths demonstrated effective ionic interactions with oppositely charged solutes, even at a high flow rate of 9.0 mL/min.
• Successful application in the rapid preconcentration of adenosine 5'-monophosphate from water using a cationic spongy monolith in an online SPE setup.

Conclusions:

• The developed ionic spongy monoliths are promising materials for rapid separation and preconcentration of ionic compounds.
• These materials offer enhanced performance in liquid chromatography and online solid-phase extraction applications.