High gradient magnetic separation of erythrocytes

Area of Science:

• Biophysics
• Cell Biology
• Biotechnology

Background:

• Red blood cells (erythrocytes) are typically diamagnetic.
• Paramagnetism can be induced in erythrocytes by oxidizing hemoglobin to methemoglobin.
• Diamagnetic cells, such as leukocytes and untreated erythrocytes, possess different magnetic properties.

Purpose of the Study:

• To apply high gradient magnetic separation (HGMS) for separating paramagnetic erythrocytes from diamagnetic cells.
• To demonstrate the feasibility of magnetically isolating specifically altered red blood cells.

Main Methods:

• Paramagnetism was induced in erythrocytes by oxidizing hemoglobin to the ferric state (methemoglobin).
• Cell suspensions containing paramagnetic (methemoglobin) and diamagnetic (oxyhemoglobin erythrocytes, leukocytes) cells were passed through a stainless steel wire column (40 micron diameter) in a high magnetic field (33 kG).
• Separation was achieved by retaining paramagnetic cells on the wire while diamagnetic cells flowed through.

Main Results:

• Paramagnetic erythrocytes were successfully retained on the stainless steel wire column.
• Diamagnetic cells, including untreated erythrocytes and leukocytes, passed through the column without retention.
• Elution of the retained paramagnetic cells was achieved by deactivating the magnetic field.

Conclusions:

• High gradient magnetic separation is a viable technique for separating paramagnetic erythrocytes from diamagnetic cells.
• This method offers a non-invasive approach for isolating specific cell populations based on induced magnetic properties.
• The technique has potential applications in cell separation and purification in biological and medical research.