Preparative-scale isoelectric trapping separations using a modified Gradiflow unit

Area of Science:

• Biochemistry
• Analytical Chemistry
• Separation Science

Background:

• The Gradiflow BF200 unit was designed for protein separation based on size and charge.
• Orthogonal flow path and electric field design are key features of the original instrument.

Purpose of the Study:

• To modify the Gradiflow BF200 for binary protein separations using isoelectric trapping.
• To evaluate the efficiency and speed of the modified instrument for protein separation.

Main Methods:

• Modification of the Gradiflow BF200 unit with a disposable separation cartridge containing three isoelectric membranes.
• Utilizing isoelectric trapping principles for protein separation.
• Demonstration of binary separation using chicken egg white across an isoelectric point 5.5 membrane.

Main Results:

• Successful binary separation of chicken egg white was achieved.
• The modified instrument demonstrated rapid desalting and separation.
• Key factors contributing to speed include short electrophoretic path, high electric field strength, and large membrane surface area.

Conclusions:

• The modified Gradiflow BF200 unit is effective for rapid binary protein separations via isoelectric trapping.
• The instrument's design facilitates efficient separation of proteins based on their isoelectric points.
• This method offers a fast and effective approach for protein analysis and purification.