A continuous-flow high-yield process for preparation of lipid-free hemoglobin

Area of Science:

• Biochemistry
• Cell Biology
• Biotechnology

Background:

• Traditional methods for isolating hemoglobin (Hb) often result in contamination with membrane stroma.
• Achieving high purity of Hb is crucial for various research and diagnostic applications.

Purpose of the Study:

• To develop a simple and effective method for isolating lipid-free hemoglobin from bovine red blood cells.
• To achieve high purity and yield of hemoglobin, minimizing contamination.

Main Methods:

• Hypotonic dialysis of bovine red blood cells to an osmotic pressure of 160-180 mosmol/kg.
• Ultrafiltration of lysed cells through 0.1-micron pore hollow fibers to isolate hemoglobin.
• Analysis of isolated hemoglobin purity using High-Performance Liquid Chromatography (HPLC) and SDS-PAGE.

Main Results:

• The developed method successfully isolated lipid-free hemoglobin with 99.6% purity confirmed by HPLC.
• SDS-PAGE analysis revealed a single protein band, indicating high purity.
• The process achieved an average hemoglobin recovery of 90% from 1/2 liter of packed red blood cells.
• Careful control of osmotic pressure was critical to prevent lipid contamination from irreversible cell lysis.

Conclusions:

• Hypotonic hollow-fiber dialysis combined with ultrafiltration is a simple, efficient method for obtaining highly pure, lipid-free hemoglobin.
• This technique offers a significant improvement over existing methods by preventing membrane stroma contamination.
• The method is scalable and provides a high yield of pure hemoglobin suitable for further research.