Poly(1-allylimidazole)-grafted silica,a new specific stationary phase for reversed-phase and anion-exchange liquid chromatography |
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| Authors: | Min Sun Hongdeng Qiu Licheng Wang Xia Liu Shengxiang Jiang |
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| Institution: | 1. Key Laboratory for Natural Medicine of Gansu Province, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China;2. Graduate School of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100039, China |
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| Abstract: | A new specific stationary phase based on poly(1-allylimidazole)-grafted silica has been synthesized and characterized, by infrared spectra, elemental analysis, thermogravimetric analysis and X-ray photoelectron spectroscopy. The results of test showed that poly(1-allylimidazole) can effectively mask the residual silanol groups and reduce the adverse effect of residual silanol. Using this stationary phase, phenol compounds, aniline compounds, and polycyclic aromatic hydrocarbons were successfully separated with symmetric peak shapes in the reversed-phase chromatography. Inorganic anions (IO3−, BrO3−, Br−, NO3−, I−, SCN−) were also separated completely in the anion-exchange chromatography using sodium chloride solution as the mobile phase. The effects of pH and the concentration of eluent on the separation of inorganic anions were studied. The separation mechanism appears to involve the mixed interactions of hydrogen bonding, hydrophobic, π–π, electrostatic, and anion-exchange interactions. |
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| Keywords: | Poly(1-allylimidazole)-grafted silica Stationary phase Reversed-phase chromatography Anion-exchange chromatography |
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