Abstract
A diterpene glycoside compound, rebaudioside A (commonly abbreviated as RA), was immobilized onto porous silica surface through "thiol-ene" click chemistry strategy. The successful immobilization of the RA on the silica support was confirmed by FT-IR and elemental analysis. Chromatographic characteristics of the new stationary phase, named Click TE-RA, were evaluated by a set of diverse analytes such as carbohydrates, nucleosides, and organic acids in hydrophilic interaction liquid chromatography (HILIC) mode. The effects of water content, buffer pH and concentration were investigated and a typical HILIC retention feature of Click TE-RA was observed at high organic modifier content. The Click TE-RA stationary phase was further studied by a series of glycoside compounds. Tunable retention mechanisms from hydrophilic to hydrophobic interactions were observed. Separation of very polar compounds including oligosaccharides, nucleic acid bases and nucleosides using Click TE-RA in HILIC mode was successfully accomplished. In addition, separation of saponins both in HILIC and reversed-phase liquid chromatography (RPLC) modes was performed, demonstrating the presence of orthogonality between two different modes on Click TE-RA column. Th...Continue Reading
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