Hydrophilic interaction/weak cation-exchange mixed-mode chromatography for chitooligosaccharides separation

Area of Science:

• Analytical Chemistry
• Chromatography
• Biochemistry

Background:

• Chitooligosaccharides (COS) are valuable biomolecules with diverse applications.
• Efficient separation techniques are crucial for COS characterization and utilization.
• Existing methods for COS separation may lack scalability or employ harsh conditions.

Purpose of the Study:

• To develop a novel chromatographic method for separating chitooligosaccharides (COS).
• To investigate the retention characteristics of a weak cation-exchange column under varying conditions.
• To establish a method suitable for potential large-scale COS preparation.

Main Methods:

• Development of a hydrophilic interaction/weak cation-exchange (HILIC/WCX) mixed-mode chromatography.
• Utilized a weak cation-exchange column for COS separation.
• Investigated the effect of organic solvent content on retention characteristics.
• Employed volatile buffer salts compatible with evaporative light-scattering detection (ELSD).

Main Results:

• The developed column demonstrated capability for WCX, HILIC, and mixed-mode chromatography.
• Chitooligosaccharides (COS) were successfully separated using the mixed-mode functionality.
• The use of volatile buffer salts facilitated detection by ELSD.
• Mild elution conditions were achieved, proving economical and environmentally friendly.

Conclusions:

• The HILIC/WCX mixed-mode chromatography provides an effective separation strategy for COS.
• The method is compatible with ELSD, enhancing its utility.
• Mild elution conditions make the method advantageous over previous techniques.
• This approach shows promise for the large-scale preparation of chitooligosaccharides.