Novel zwitterionic polyphosphorylcholine monolithic column for hydrophilic interaction chromatography

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• 作者：Zhengjin Jiang ; John Reilly ; Brian Everatt ; Norman W. Smith
• 关键词：Capillary liquid chromatography ; Monolith ; Hydrophilic interaction chromatography ; Phosphorylcholine ; Weak electrostatic interaction ; Zwitterionic
• 刊名：Journal of Chromatography A
• 出版年：2009
• 出版时间：20 March 2009
• 年：2009
• 卷：1216
• 期：12
• 页码：2439-2448
• 全文大小：1025 K

文摘

A novel porous zwitterionic monolith was prepared by thermal co-polymerisation of 2-methacryloyloxyethyl phosphorylcholine (MPC) and ethylene glycol dimethacrylate (EDMA) within 100 μm I.D. capillaries. Mercury intrusion porosimetry, scanning electron microscopy (SEM), micro-HPLC (μ-HPLC), elemental analysis and ζ-potential analysis were used to evaluate the monolithic structure. No evidence of swelling or shrinking of the monolith in different polarity solvents was observed. A typical hydrophilic liquid chromatography (HILIC) mechanism was observed at high organic solvent content (acetonitrile >60 % ). The phosphorylcholine (PC) functionality has both a positively charged quaternary ammonium and a negatively charged phosphate group. For charged analytes, a weak electrostatic interaction was also observed by studying the influence of mobile phase pH and salt concentration on their retentions on the poly(MPC-co-EDMA) monolithic column. The optimised poly(MPC-co-EDMA) monolith showed very good selectivities for a range of polar test analytes, especially small peptides. This might be ascribed to the good biocompatibility of PC functionality. At low organic solvent content, baseline separation was also observed for a test mixture of seven alkylphenones by a reversed-phase separation mechanism.