Aqueous Biphasic Systems Containing Customizable Poly(Ionic Liquid)s for Highly Efficient Extractions

Area of Science:

• Polymer Chemistry
• Separation Science
• Green Chemistry

Background:

• Aqueous biphasic systems (ABSs) offer sustainable alternatives for liquid-liquid extraction.
• Developing high-performance ABSs with effective phase separation and extraction capabilities remains a challenge.
• Ionic liquids (ILs) are explored for ABSs, but polymer-based systems offer enhanced tunability.

Purpose of the Study:

• To prepare novel poly(ionic liquid)s (PILs) for customized aqueous biphasic systems (ABSs).
• To evaluate the phase separation and extraction performance of PIL-based ABSs for bioactive compounds.
• To demonstrate the tunability of PIL-based ABSs by altering molecular weight and counteranion.

Main Methods:

• Synthesis of tailor-made PILs via reversible addition fragmentation chain-transfer polymerization.
• Construction of PIL-based aqueous biphasic systems (ABSs).
• Extraction and quantification of six model bioactive compounds (e.g., tryptophan, phenylalanine, caffeine).

Main Results:

• PIL-based ABSs exhibited excellent phase separation, surpassing IL monomers and conventional polymers.
• Unprecedentedly high partition coefficients and extraction yields were achieved for target bioactive compounds.
• System performance was tunable by modifying PIL molecular weight and counteranion type.

Conclusions:

• Tailor-made PIL-based ABSs represent a promising platform for efficient bioactive compound extraction and purification.
• The design of PILs with controlled structures enables optimization of ABS performance.
• This study provides insights for developing advanced separation systems for diverse applications.