Columns switch recycling size exclusion chromatography for high resolution protein separation

Area of Science:

• Biochemistry
• Analytical Chemistry
• Chromatography

Background:

• Size exclusion chromatography (SEC) is a common technique for protein separation.
• Traditional SEC has limitations in resolution and separation window.
• Recycling SEC (rSEC) improves separation but can suffer from component overtaking.

Purpose of the Study:

• To introduce and evaluate Columns Switch Recycling Size Exclusion Chromatography (csrSEC) for enhanced protein separation.
• To demonstrate the advantages of csrSEC over conventional SEC and rSEC.
• To develop a multidimensional separation platform based on csrSEC.

Main Methods:

• Proteins were separated using two serially coupled SEC columns.
• Fractions were sequentially recycled back to the first column using two-position valves.
• A multidimensional csrSEC-RPLC platform was constructed for advanced protein analysis.

Main Results:

• csrSEC achieved baseline separation of five proteins (10-80 kDa).
• The separation window was broadened without increasing back pressure.
• Overtaking of components was avoided in complex samples.
• A peak capacity of up to 3600 was obtained using a multidimensional csrSEC-RPLC platform.

Conclusions:

• csrSEC is a promising technique for high-resolution protein separation.
• The method offers improved biocompatibility and a broadened separation window.
• csrSEC enhances resolution and avoids issues seen in rSEC, making it suitable for complex samples.