A zwitterionic (poly)methacrylate monolithic capillary column with dual HILIC – reversed-phase mechanism for uni- and two-dimensional HPLC

Abstract

Sulfobetaine zwitterionic monolithic columns were synthesized by in-situ polymerization (in fused silica capillaries) of a N,N-dimethyl-N-metacrylaloxyethyl-N-(3-sulfopropyl) ammonium betaine (MEDSA) functional monomer in combination with different cross-linking monomers. From among the ten cross-linkers tested, Bisphenol A glycerolate dimethacrylate provides monolithic capillary column with the best chromatographic efficiency (60 000 – 70 000 theoretical plates per meter). The respective columns show excellent column-to-column reproducibility of pore morphology, separation selectivity, good permeability and low mass transfer resistance, so that being suitable for fast and selective separation of various samples.