Abstract
A new stationary phase which contains both negatively charged phosphate groups and positively charged amino groups was successfully synthesized by modification of amino-functionalized silica particles with trichlorophosphine oxide (POCl3) for hydrophilic interaction chromatography (HILIC). The composition of the surface grafts was determined by Fourier transform infrared spectroscopy and elemental analysis. Various parameters, such as column temperature, water content, pH values and ionic strength of the mobile phase were investigated to study the retention mechanism. The results demonstrated that the stationary phase involved a complex retention process including surface adsorption, partitioning and electrostatic interactions. Under optimized conditions, the separation of nucleobases and nucleosides, water-soluble vitamins, organic acids on the novel stationary phase could be achieved in the HILIC mode.
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Acknowledgments
The authors thank the financial support from the National Key Basic Research Foundation of China (973 Program) (2013CB910702,2012CB720601), the National Natural Science Foundation of China (91017013, 31070327, 21005057), and the Fundamental Research Funds for the Central Universities.
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Cheng, XD., Peng, XT., Yu, QW. et al. Preparation of a Novel Amino-Phosphate Zwitterionic Stationary Phase for Hydrophilic Interaction Chromatography. Chromatographia 76, 1569–1576 (2013). https://doi.org/10.1007/s10337-013-2534-3
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DOI: https://doi.org/10.1007/s10337-013-2534-3