title: Metal-organic framework polymethyl methacrylate composites for open-tubular capillary electrochromatography.
abstract: Metal-organic frameworks (MOFs) are attractive as novel separation medium due to their distinguished properties including large surface area, accessible tunnels and diverse structures. Here, we report the incorporation of MOF CAU-1 (CAU=Christian-Albrechts-University) into polymethyl methacrylate (PMMA) to produce a new composite (CAU-1@PMMA), and the fabrication of CAU-1@PMMA coated capillary for open tubular capillary electrochromatography (CEC). CAU-1 contains unprecedented [Al8(OH)4(OCH3)8](12+) clusters connected by twelve aminoterephthalic acid linkers, and is highly porous and stable in a variety of buffer solutions. The incorporation of CAU-1 into PMMA not only increases surface area, but also electroosmotic flow (EOF). As a result, the CAU-1@PMMA coated capillary column gives higher column efficiency, larger column capacity, and shorter separation time for baseline separation of two groups of aromatic carboxylic acids than the PMMA coated capillary column. Besides, the incorporation of CAU-1 also improves the resolution for the CEC separation of basic sulfa drugs and structurally related peptides. The run-to-run, day-to-day and column-to-column precision for the EOF of CAU-1@PMMA coated capillary column is 0.3%, 0.4%, and 2.2% (relative standard deviation), respectively. The results show that MOFs composites are promising stationary phases for CEC applications.
authors.affiliation: State Key Laboratory of Medicinal Chemical Biology (Nankai University), Synergetic Innovation Center of Chemical Science and Engineering (Tianjin), and Research Center for Analytical Sciences, College of Chemistry, Nankai University, Tianjin 300071, China.
authors.forename: Li-Man
authors.initials: LM
authors.lastname: Li
authors.forename: Fang
authors.initials: F
authors.lastname: Yang
authors.forename: He-Fang
authors.initials: HF
authors.lastname: Wang
authors.forename: Xiu-Ping
authors.initials: XP
authors.lastname: Yan
mesh_terms: D002021:Buffers; D053801:Capillary Electrochromatography / Q000295:instrumentation / Q000379:methods; D053841:Electroosmosis; D006841:Hydrocarbons, Aromatic / Q000737:chemistry / Q000302:isolation & purification; D006863:Hydrogen-Ion Concentration; D008956:Models, Chemical; D009942:Organometallic Compounds / Q000737:chemistry*; D019904:Polymethyl Methacrylate / Q000737:chemistry*
chemical_list: D002021:Buffers; D006841:Hydrocarbons, Aromatic; D009942:Organometallic Compounds; D019904:Polymethyl Methacrylate
keywords: Metal-organic framework composites; Metal-organic frameworks; Open tubular capillary electrochromatography