Influence of magnetic field on aqueous two-phase extraction of horse ferritin in the polyethylene glycol/hydroxyethyl starch system.

The research investigates the extraction of horse ferritin, a protein, using a water-based system of polyethylene glycol and hydroxyethyl starch, and how a magnetic field can enhance this process. Concentration levels of extracted ferritin varied with varying levels of starch and polyethylene glycol components, with magnetic field application leading to an increase in extract concentration.

Research Methodology

• The study utilized an aqueous two-phase system mixing polyethylene glycol (PEG) and hydroxyethyl starch (HES) to extract ferritin, a protein, from horse spleen.
• The study further experimented with different concentration levels of PEG and HES, as well as varying PEG molecular weights, to evaluate how these factors influenced protein migration.
• A magnetic field was also introduced to observe how it affected ferritin accumulation in the system. Samples were placed between homogeneous or heterogeneous magnetic poles.

Findings and Observations

• The research found that the protein’s migratory propensity was directly influenced by PEG and HES concentrations and PEG molecular weight.
• The highest concentration of ferritin was recorded in a system comprised of 6% PEG 3000 and 3% HES, receiving a concentration of 0.88 mg mL(-1). Conversely, the lowest concentration was noted at 0.42 mg mL(-1) in the system with 5% PEG 6000 and 1% HES.
• The application of a magnetic field to the extraction process resulted in a significant increase in ferritin extraction in all examined systems.
• The introduction of a magnetic field resulted in an increase as high as a 1.67-fold in ferritin concentration in the PEG phase compared to the total ferritin concentration before separation.

Conclusion

• The study results indicate that applying a magnetic field to two-phase extraction systems can effectively alter the partition coefficient of ferritin, thus enhancing ferritin extraction. This technique could have practical applications in protein extraction processes.