title: A reversed-phase/hydrophilic interaction mixed-mode C18-Diol stationary phase for multiple applications.
abstract: A mixed-mode chromatographic packing material, C18 and diol groups modified silica (C18-Diol), was prepared with controllable hydrophobicity and hydrophilicity. It demonstrated excellent aqueous compatibility and stability in aqueous mobile phase; compared to the traditional C18 column, improved peak shape of basic analytes was also obtained. Additionally, it exhibited both reversed-phase liquid chromatographic (RPLC) and hydrophilic interaction chromatographic (HILIC) performance; the analyte separation scope was thus enlarged, demonstrated by simultaneous separation of twenty acids, bases and neutrals. More interestingly, a novel on-line two-dimensional liquid chromatography on the single column (2D-LC-1C) was established by modifying the high performance liquid chromatographic instrument only with the addition of an extra six-port two-position valve. The early co-eluted components of the extract of Lonicera japonica on the 1st-dimension (RPLC) were collected for the online re-injection to the 2nd-dimension (HILIC) by conveniently varying the mobile phase components. Six more peaks were obtained. The established system was simple, easy operation and low cost, which had advantages in analyzing complicated samples.
authors: Tongji School of Pharmacy, Huazhong University of Science and Technology, Wuhan, 430030, China.
authors: Qing
authors: Q
authors: Wang
authors: Tongji School of Pharmacy, Huazhong University of Science and Technology, Wuhan, 430030, China.
authors: Mao
authors: M
authors: Ye
authors: Tongji School of Pharmacy, Huazhong University of Science and Technology, Wuhan, 430030, China.
authors: Li
authors: L
authors: Xu
authors: Department of Chemistry, Wuhan University, Wuhan, 430072, China. Electronic address: shizg@whu.edu.cn.
authors: Zhi-guo
authors: ZG
authors: Shi
mesh_terms: D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000032:analysis / Q000302:isolation & purification; D056148:Chromatography, Reverse-Phase / Q000191:economics / Q000295:instrumentation*; D004867:Equipment Design; D057927:Hydrophobic and Hydrophilic Interactions; D031239:Lonicera / Q000737:chemistry; D010936:Plant Extracts / Q000737:chemistry; D012822:Silicon Dioxide / Q000737:chemistry*
chemical_list: D000894:Anti-Inflammatory Agents, Non-Steroidal; D010936:Plant Extracts; D012822:Silicon Dioxide
keywords: Hydrophilic interaction chromatography; Mixed-mode chromatography; Reversed phase liquid chromatography; Two-dimensional liquid chromatography on the single column