title: Chromatographic behavior of 12 polar pteridines in hydrophilic interaction chromatography using five different HILIC columns coupled with tandem mass spectrometry.
abstract: Retention characteristic of 5 hydrophilic interaction chromatography (HILIC) columns, containing neutral and possibly negatively charged support (silica, diol and amide), cationic phase (triazole) and zwitterionic phase (sulfobetaine), that are commercially available were studied for the separation of a group of 12 polar pteridines. The main factors influencing the retention and selectivity of pteridines for these different HILIC systems have been studied in liquid chromatography-tandem mass spectrometry (LC-MS/MS) conditions: mobile phase composition, buffer type, pH and concentration and the separation mechanism was also investigated. Results of the effects of organic modifier, buffer pH and ion strength indicate that the retention mechanism is a mixed-mode of adsorption and ion exchange, and optimization of HILIC analyses depends on the ionization state of the analytes. For silica, diol, amide and sulfobetaine phases, hydrophilic partitioning mainly contributes to the retention, while electrostatic interactions and hydrogen-bonding should be considered to understand the elution orders for triazole phase. An zwitterionic phase (ZIC-HILIC) provided the stronger retention for all pteridines than other tested columns.
authors.affiliation: Department of Pharmacy, Peking University Third Hospital, Beijing 100191, PR China. Electronic address: xiongxin1029@outlook.com.
authors.forename: Xin
authors.initials: X
authors.lastname: Xiong
authors.affiliation: Department of Pharmacy, Peking University Third Hospital, Beijing 100191, PR China; School of Pharmaceutical Sciences, Peking University, Beijing 100191, PR China.
authors.forename: Yanmeng
authors.initials: Y
authors.lastname: Liu
mesh_terms: D002853:Chromatography, Liquid / Q000379:methods*; D006801:Humans; D057927:Hydrophobic and Hydrophilic Interactions; D011621:Pteridines / Q000652:urine*; D053719:Tandem Mass Spectrometry / Q000379:methods*; D016482:Urinalysis / Q000379:methods*
chemical_list: D011621:Pteridines
keywords: Hydrophilic interaction liquid chromatography; Polar pteridines; Retention behavior; Tandem mass spectrometry