Preparation, characterization and application of a reversed phase liquid chromatography/hydrophilic interaction chromatography mixed-mode C18-DTT stationary phase

• Published in: Talanta (Oxford) 2016-01, Vol.146, p.442-451
• Main Authors: Wang, Qing, Long, Yao, Yao, Lin, Xu, Li, Shi, Zhi-Guo, Xu, Lanying
• Format: Article
• Language: English
• Subjects: Acetonitriles - chemistry; Alkaloids - analysis; Anti-Inflammatory Agents, Non-Steroidal - analysis; Buffers; Carboxylic Acids - analysis; Chromatography, Reverse-Phase - methods; Click chemistry; Dithiothreitol - chemistry; Hydrogen-Ion Concentration; Hydrophilic interaction chromatography; Hydrophobic and Hydrophilic Interactions; Mixed-mode chromatography; Polycyclic Aromatic Hydrocarbons - analysis; Reversed phase liquid chromatography; Silicon Dioxide - chemistry; Temperature
• ISSN: 0039-9140; 1873-3573
• DOI: 10.1016/j.talanta.2015.09.009

A mixed-mode chromatographic stationary phase, C18-DTT (dithiothreitol) silica (SiO2) was prepared through “thiol-ene” click chemistry. The obtained material was characterized by fourier transform infrared spectroscope, nitrogen adsorption analysis and contact angle analysis. Chromatographic performance of the C18-DTT was systemically evaluated by studying the effect of acetonitrile content, pH, buffer concentration of the mobile phase and column temperature. It was demonstrated that the novel stationary phase possessed reversed phase liquid chromatography (RPLC)/hydrophilic interaction liquid chromatography (HILIC) mixed-mode property. The stop-flow test revealed that C18-DTT exhibited excellent compatibility with 100% aqueous mobile phase. Additionally, the stability and column-to-column reproducibility of the C18-DTT material were satisfactory, with relative standard deviations of retention factor of the tested analytes (verapamil, fenbufen, guanine, tetrandrine and nicotinic acid) in the range of 1.82–3.72% and 0.85–1.93%, respectively. Finally, the application of C18-DTT column was demonstrated in the separation of non-steroidal anti-inflammatory drugs, aromatic carboxylic acids, alkaloids, nucleo-analytes and polycyclic aromatic hydrocarbons. It had great resolving power in the analysis of various compounds in HILIC and RPLC chromatographic conditions and was a promising RPLC/HILIC mixed-mode stationary phase. [Display omitted] •A mixed-mode stationary phase, C18-DTT, was prepared via “thiol-ene” click chemistry.•It had both reversed phase and hydrophilic interaction chromatographic properties.•It exhibited good stability and 100% aqueous mobile phase compatibility.•It was suitable for separating a series of polar and non-polar analytes.