Double-modified albumins as a tool for antibody purification

Area of Science:

• Biochemistry
• Immunotechnology
• Protein Chemistry

Background:

• Antibody purification is crucial for research and diagnostics.
• Existing methods can be time-consuming and costly.
• Hapten-specific antibodies require specialized purification strategies.

Purpose of the Study:

• To develop a general and efficient method for anti-hapten antibody purification.
• To utilize double-modified albumins for simultaneous hapten and affinity tag conjugation.
• To evaluate the purification performance using different albumin types.

Main Methods:

• Simultaneous modification of albumin (BSA, HSA, ovalbumin) with a hapten (fluorescein) and desthiobiotin.
• Application of modified albumins for purifying anti-fluorescein monoclonal antibody (mAb).
• Analysis of mAb purity and concentration from complex mixtures, including E. coli cell lysate.

Main Results:

• Achieved high purity of recovered mAb, ranging from 88% to 95%.
• Successful purification across a wide range of target antibody concentrations (0.02–0.66 mg/ml).
• Purification completed within approximately 20 minutes, demonstrating rapid efficiency.
• Purity remained high even with increased contamination background.

Conclusions:

• Double-modified albumins provide a versatile platform for anti-hapten antibody purification.
• The developed method offers a fast, efficient, and high-purity solution for antibody recovery.
• This approach is applicable to various albumin types and complex biological samples.