Extraction of monoclonal antibodies (IgG1) using anionic and anionic/nonionic reverse micelles

Area of Science:

• Biotechnology
• Biochemistry
• Separation Science

Background:

• Monoclonal antibody (MAb) production is increasing, necessitating efficient purification methods.
• Current affinity chromatography methods face challenges keeping pace with expression levels.
• Research is exploring alternatives to chromatography for MAb purification.

Purpose of the Study:

• To investigate reverse micellar extraction as an alternative MAb purification technique.
• To evaluate the extraction efficiency and bioactivity recovery of IgG1 using different surfactant systems.
• To optimize surfactant combinations for enhanced MAb purification.

Main Methods:

• Utilized reverse micellar extraction with anionic (AOT) and nonionic surfactants (Brij-30, Tween-85, Span-85) in isooctane.
• Varied parameters including pH, cation concentration, and surfactant concentration.
• Assessed IgG1 extraction efficiency and bioactivity recovery.

Main Results:

• AOT/Isooctane system achieved 80-90% IgG1 extraction but only 30% bioactivity recovery.
• Combining AOT with Brij-30 (AOT/Brij-30/Isooctane) yielded >90% extraction and 59% bioactivity recovery.
• AOT/Tween-85/Isooctane system resulted in 75-80% extraction and 40-45% bioactivity recovery.

Conclusions:

• Reverse micellar extraction is a viable alternative for MAb purification.
• Surfactant combinations significantly enhance IgG1 bioactivity recovery.
• Further optimization of this technique shows promise for downstream MAb purification.