Preparation of polyhydroxy hydrophilic chromatographic stationary phases for alginate oligosaccharide separation

Abstract

To solve the problem of poor selectivity of oligosaccharide separation, a new functionalized silica stationary phase, SPTM(THMA-co-MBAAm), was prepared with N-[tris(hydroxymethyl)methyl]acrylamide (THMA) and N,N-methylenebisacrylamide (MBAAm) containing hydroxyl groups as functional monomers. This stationary phase was used to do hydrogen bonding-based oligosaccharide compound separation. The stationary phase SPTM was successfully prepared, and the functional monomers were bonded onto an SiO₂ matrix. The separation of nucleobases and nucleosides on SPTM conformed to the multiple retention mechanism (i.e., a distribution mechanism supplemented by an adsorption mechanism). As a result of the hydrophilic hydroxyl groups on the outermost layer of the phase of stagnation, a layer rich in water was created. The bonds of hydrogen and electromagnetic attraction in addition to repulsion were additionally involved in retention. SPTM was applied to the separation of samples of alginate oligosaccharides with optimized mobile-phase conditions.