Good's Buffer Ionic Liquids as Relevant Phase-Forming Components of Self-Buffered Aqueous Biphasic Systems

Area of Science:

• Green Chemistry
• Biotechnology
• Materials Science

Background:

• Ionic liquids (ILs) offer tunable properties for various applications.
• Self-buffering ILs can simplify chemical processes by maintaining pH.
• Protein extraction often requires efficient and biocompatible methods.

Purpose of the Study:

• To synthesize and characterize novel self-buffering ionic liquids (ILs) using Good's buffers (GBs).
• To evaluate the ability of these GB-ILs to form aqueous biphasic systems (ABS).
• To investigate their efficacy in extracting proteins, specifically bovine serum albumin (BSA).

Main Methods:

• Synthesis and potentiometric characterization of GB-ILs.
• Formation of aqueous biphasic systems with potassium citrate.
• Protein extraction efficiency determination for BSA.
• Spectroscopic analysis (FTIR) of protein secondary structure.
• Dynamic light scattering (DLS), COSMO-RS, and molecular docking studies.

Main Results:

• Synthesized ILs exhibit self-buffering behavior and low toxicity.
• Effective formation of aqueous biphasic systems with high protein extraction efficiency (up to 100%).
• Protein secondary structure remains intact in IL-rich phases, indicating a protein-friendly environment.
• Van der Waals and hydrogen bonding interactions drive protein extraction.

Conclusions:

• Novel self-buffering GB-ILs are effective for protein extraction via ABS.
• These ILs provide a biocompatible and efficient platform for protein separation.
• Understanding interaction mechanisms aids in designing advanced separation technologies.