Stationary phases for hydrophilic interaction chromatography, their characterization and implementation into multidimensional chromatography concepts
Tóm tắt
Hydrophilic interaction chromatography (HILIC) is becoming increasingly popular for separation of polar samples on polar columns in aqueous‐organic mobile phases rich in organic solvents (usually ACN). Silica gel with decreased surface concentration of silanol groups, or with chemically bonded amino‐, amido‐, cyano‐, carbamate‐, diol‐, polyol‐, or zwitterionic sulfobetaine ligands are used as the stationary phases for HILIC separations, in addition to the original poly(2‐sulphoethyl aspartamide) strong cation‐exchange HILIC material. The type of the stationary and the composition of the mobile phase play important roles in the mixed‐mode HILIC retention mechanism and can be flexibly tuned to suit specific separation problems. Because of excellent mobile phase compatibility and complementary selectivity to RP chromatography, HILIC is ideally suited for highly orthogonal 2‐D LC‐LC separations of complex samples containing polar compounds, such as peptides, proteins, oligosaccharides, drugs, metabolites and natural compounds. This review attempts to present an overview of the HILIC separation systems, possibilities for their characterization and emerging HILIC applications in 2‐D off‐line and on‐line LC‐LC separations of various samples, in combination with RP and other separation modes.
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Tài liệu tham khảo
Grumbach E. S. Diehl D. M. McCabe D. R. Mazzeo J. R. Neue U. D. LC GC N. Am.2005 53.
Grumbach E. S., 2004, LC GC, 22, 1010
Pesek J. J., 2006, LC GC, 24, 296
Liu X. Pohl C. J. Chromatogr. A 2008 in press.
Kaliszan R. Quantitative Structure – Chromatographic Retention Relationship Wiley New York 1987.
Schoenmakers P. J., 2003, LC GC Eur., 16, 335
Neue U. D., 2001, Adv. Chromatogr., 41, 93
Martin A. J. P., 1949, Biochem. Soc. Symp., 3, 4
Deguchi K. Keira T. Yamada K. Ito H.et al. J. Chromatogr. A2007 in press.